Hardware, Boat Cabin That is correctfuel pressure at idle should be around 15-16psi. Axles, Boat Trailer Tie ###The hose attached to the pressure regulator on the fuel rail. Intake manifold. If the oil level dips too low, it can cause a change in pressure when the engine is idling. Copyright 2019 IBOATS. You dont want to add an abundance of fresh oil to dirty oil, as this simply degrades what you are adding. That said, here are the top 8 most common reasons why you have low fuel pressure: A common symptom you might notice is throttle response. However,the struggle is what if I want to check the fuel pump pressure, and I dont have this specialtool? This happens when the fuel pump fails to supply a constant stream of fuel at a proper pressure for a long period. Fuel pressure gauges are relatively cheap, and you can find one for roughly $30. I took it for a rip and its hard to tell if there is a difference above 4000 rpms. Too high of pressure may result in, over fueling of the engine. The noob belief amongst amateur tuners is increasing the fuel pressure up a few psi from the regulator will mean the injectors are getting moaar fuel which will increase the horsepower. That said, another culprit you could have is a bad fuel pump relay. 20 in hg is about 10 psi. i think that is to much. Zach says that .005 change in size will be a noticeable difference. Distribution, ProMariner ProNautic It does not store any personal data. Like sunsetdart said, if you have an adjustable regulator, maybe it is adjusted down to 3 psi and a turn of the screw will correct the pressure. You should get close to 20 PSI. All Rights Reserved. Here's How To Fix It. In general, most vehicles fuel pressure range is between 40 80 psi. Here are the 5.9 Cummins common rail fuel pressure specs: The average rail pressure at idle should be about 5,600-6,500 PSI. Apr 2, 2010. well i just checked it. Trolling Motors, Shop I decided to check all the normal things, plugs, fuel filters, and fuel pressure including a leakdown test on the high pressure pump and all is good. To repair the gauge, you must first determine what part is failing. Justcontinue reading thisguide, and youshall be ableto do this job perfectly. Lighting, Marine Teak A forum community dedicated to hot rod owners and enthusiasts. Begin typing your search term above and press enter to search. To determine where the correct opening point is, you need to keep adjusting the screw out until you get a bog, then turn the screw in -turn. a faulty fuel pressure regulator may result in fuel pressure that is too high and a rich running condition. Both trucks have ~220,000km, my truck has all new injectors but his doesn't. ACCOUNT, Find Re: What should fuel pressure be at idle? If youre getting low fuel pressure, then thats your culprit. You can also have the engine rebuilt. We may earn a small commission if you purchase through our recommended links. Some drivers might get a fuel pressure gauge, tape it to the windshield, and run a test, but this looks weird. For more information about these steps, watch this video: Got any more questions about 5.9 Cummins fuel rail pressure specs? if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'georgelawsongallery_com-box-3','ezslot_1',169,'0','0'])};__ez_fad_position('div-gpt-ad-georgelawsongallery_com-box-3-0');The 5.9 Cummins fuel pressure specs can change while driving. Low fuel pressure is actually what causes the PCM to activate the Check Engine light. The fuel then travels from the fuel tank located on the cars backside to the fuel injection and makes it ready to be injected inside the engine. Engine Pops At High Speeds:In this case, you notice that the engine sputters and gets back to normal when driving at high speeds or for long. Combos, Fishing Tools & Fuel pressure is one of the most important factors in controlling the performance and operation of your car. Three 8 fuel lines can result in adequate (indicated) fuel pressures, but restricted fuel flow. A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Some of these symptoms include your engine running rough, poor fuel economy and black smoke from the exhaust. Usually a faulty fuel pressure regulator will produce a few symptoms that will alert the driver of a potential issue. These engines can be found at the salvage yard but normally dont have any guarantees. Press ESC to cancel. These pipesaremade from fuel line materials, specially designed for this purpose. Winches, Boat Motor Supports & Now it has 40 and 45 PSI. link to What is Inside a Catalytic Converter? Get on the vehicle, and turn the key to get the fuel pressure rating at stationary. Ifnot, then you require replacingthepump. Can a bad fuel pump cause high fuel pressure? This is really starting to irritate me since the boat is in the shop because it won't reach WOT. PSI with key turned on and fuel pump engages: 43 PSI with key turned on and fuel pump shuts off: 40 steady with no drop off over time PSI with engine idling: 38 Does for Sale, Buy A Fasteners, Boat Windshield When warmed up it will idle but it doesn't want to. Copyright 2023 Mechanic Base. What voltage should a fuel pressure regulator have? However, this repair can have varying costs, depending on what type of vehicle you drive. For about 99% of street applications, the 40% link that comes installed on all mechanical secondary carbs will be ideal for your application. Varnish, Marine Adhesives, Financing, Iboats Dont forget to also change the oil filter to ensure none of the old fluid remains in the system. Maintenance, Fiberglass & Epoxy Spark plugs dont get a lot of credit. If the fuel Plus, the motor wont get the lubrication it needs. The pump cant work with the right amount of oil when it gets too low. Am I suppose to see a fluctuation? At 185 it should be about 4.3kpsi. When this happens, your fuel pressure will drop. No more than 20psi, and should never drop below 10psi. According to the manufacturer, the fuel pressure should be between 4.0 and 7.0 bar. This usually means that you have low fuel pressure. Switches, Shore Power & AC We are an automotive mechanic blog that helps mechanics and car users to find the most recent and accurate technical and repair information for their cars. In control terminology, the rail pressure is the system output while the position of the actuator used to control the rail pressure is the system input. If theres something wrong with this part, then you will get low fuel pressure. Accessories, Marine Electrical For example, if youre getting low fuel pressure, you will notice it immediately, track down the problem and fix it. Started it up for the first time today with minor coolant leaks/etc. Never drive with low fuel pressure since it could damage your engine. All this heat needs to go away, but if there isnt any way for it to go, it will damage the inside of the pump. I think you have to divide the inches of mercury by 2.X to get the lbs conversion. When you note any of theabove symptoms, you need to check your fuel pump immediately. Quick Fuel Technology (QFT) ships carburetors only after they have been thoroughly run-tested and adjusted on a typical engine. Revving up the engine is not a great way to find if youre getting low fuel pressure. Well, the reason is that fuel in the tank is supposed to be cooling down the unit. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. A Fuel Rail Pressure Gauge reads the fuel pressure in your diesel truck directly from the common rail to ensure it is running at optimal levels. The fuel pump should make an audible noise if its working properly. Stay up to date with the latest releases, events, promotions and more. Trouble starting the vehicle or uneven idling. This cookie is set by GDPR Cookie Consent plugin. There are some engine issues that could be fixed. If youre not quite sure if youre getting the correct fuel pressure, hook up one of those fuel pressure gauges to your car, and you should be good to go. At 310-482kPA, the oil pressure is between 45-70 PSI at idle. So I should be around the 525 rwhp range when all done. They are claiming that the only way to get an accutare fuel pressure reading it to take it to the lake and run it at WOT. Parts, Boat Tubing & 405. eden prairie mn. Waxes, Boat Cleaning If you have a problem accessing a sophisticated fuel pressure gauge, you can check fuel pressure with a tire gauge. Analytical cookies are used to understand how visitors interact with the website. The pump sucks the fuel and rails it through the fuel filter to get rid of any particles and impurities. It could be the gauge itself or one of the sensors, both of which require professional diagnostics to determine. If your multimeter reads low voltage when testing the battery, it could be the reason why youre getting low fuel pressure. Again, the vehicle must be up to operating temperature and check to see if your fuel pressure is holding at 6.5psi and the float level is still correct. This can get you out of so much trouble in the future. Protection, Dock Storage & This means that your fuel pressure regulator is about to die. Castrol Edge vs. Mobil 1 Oil: Differences & Which Is Better? Your not gonna get an accurate reading going by an electric sender on the rail. If the oil is too thin or thick, it wont flow through the engine properly. If you have a base fuel pressure of 39 PSI (stock for our cars) then don't expect to see around 40 PSI idling. While the motor was at the machine shop I installed a kenne bell bap. You also have the option to opt-out of these cookies. In this guide, we will learn more about this problem and how to solve it. AN However, a vehicles fuel system only needs modest adjustments. The cookie is used to store the user consent for the cookies in the category "Performance". Which is correct poinsettia or poinsettia? when i would unplug the regulator it would go up to about 55-58 range. I have adjusted it all the way in to all the way out and I see no difference in fuel pressure at the gauge. If your QFT doesnt have a choke it probably has a 4.5 power valve from the factory. While this isnt something you want to deal with, it can happen, especially if you havent maintained it properly. At 185 it should be about 4.3kpsi. If the oil levels are low in the engine, the only solution is to add the right amount. Breakers, Power Packs & Jump Fuel pressure varies from one car to another, but it is always around 40 psi. Now, theres a high chance you wont blow it up if its just a one-time thing. The only times I ever log actual fuel pressure anymore is when diagnosing a problem. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The fuel pressure regulators job is to make sure that you dont have constant fuel pressure. This cookie is set by GDPR Cookie Consent plugin. While it might make sense, 100% of the cars I have worked on or seen drop about 9-10psi from base pressure when idling. Dont just stick any old power valve in your carburetor. Normallyprofessional mechanics always use fuel pressure gaugespecifically made to dothis job perfectly. It's an '03 Mercury 225 efi I purchased a few months ago. Step 4:Tryto check the fuel pipelines that came out from the fuel pump andtakefuel to the engine. Sealant, & However, setting the vacuum secondary opening point requires trial and error road testing of the vehicle. For a better experience, please enable JavaScript in your browser before proceeding. Galley, Barbeque The Fora platform includes forum software by XenForo. It could be either issue leading to a faulty reading. This step is optional. Fuel pressure always varies depending on the load of the engine. Boarding, Paddles & NOTE: Adjusting fuel pressure with the engine running could cause a fire hazard. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! - Hot Rod www.hotrodders.com > Tech Help > Engine Oct 20, 2008 - 11 posts - 8 authors I have 3psi of pressure at idle. Any help would be great. At times, the issue is modest, and occasionally, it could be enormous. When making adjustments -turn at a time is a good way to proceed. Turn the ignition key to the run position and carefully listen for a slight humming sound coming from the fuel tank. If you used the wrong type of oil in the engine during the last change, it could cause pressure problems. my reads right at 30 at idle but I think it is a little low I am going to bump it 2psi when i get a adjustable reg. Professionals. Verify the fuel pressure is between 384-425 kPa (56-62 psi). JavaScript is disabled. To check the fuel pressure, you need a fuel pressure gauge. If the vehicle is not under any load, you should get about 17-22 PSI and 32-35 at WOT. Hitches, & It might go up or down 100 psi, that's normal. Fuel pressure questions, '05 duratec | Focus Fanatics Forum Codes for 2-7 are: P0202 or 07, P2149 or 46 Injector Positive Voltage Relay Control Circuit Group 2 or 1. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Grills, Boat Drink This is especially in high-load situations such as sudden acceleration, or climbing a hill when the car needs all its power. & Rings, Prop Nut Kits & Thereby causing the pressure to read as "normal". Most street carbs run at 5 lb, for racing 7lb. Start by disconnectingthe hose or pipe that came to the injectors rail. Meters, Marine Electrical Panels I have been working as a mechanic for over fifteen years. Jiffy Lube Vs. Valvoline Oil Change: Differences & Which Is Better? Start the engine; the fuel pressure should remain the same. If you hadnt changed the oil in the engine when you were supposed to, it could affect the pressure. Charts & The pressure can vary depending on the operating status and speed. GPS Chartplotter and Fish Finder Combo, Find This website uses cookies to improve your experience while you navigate through the website. How do you fix fuel rail pressure too low? So, if your vehicle is surging or coughing through the carb (popping) at wide-open throttle, you can richen it up with larger restrictors. Boat Gel Coat - Spectrum Color, Pumps and My factory service manual states fuel pressure should be 50 psi with the engine running at idle. Wed say that they are heroes working in the shadows. This cookie is set by GDPR Cookie Consent plugin. WebStill, we have calculated it as an average of 25-27 PSI at idle, where PSI stands for pressure per square inch and is the unit used to measure pressure. If the regulator goes bad for some reason, there are some common signs that indicate it needs replacement. Caulking, Marine Engine But opting out of some of these cookies may affect your browsing experience. Seats, Offshore Boat It just takes a single spark plug to throw off the vehicle.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[580,400],'georgelawsongallery_com-large-mobile-banner-1','ezslot_16',176,'0','0'])};__ez_fad_position('div-gpt-ad-georgelawsongallery_com-large-mobile-banner-1-0'); For example, one of the many problems you will face is low fuel pressure. Video, GPS Chartplotters & The fuel pressure should be down at like 5-8 psi unless you're talking about a completely different car in that case an EFI car pressure is fine anywhere between 35 After a long stretch of steady-state highway driving pull off in a rest area and check the tailpipes. - All You Need To Know, All You Need to Know About the Tom Ogle Engine, How Often Should You Start Your Car when in Storage for a Long Time. Fittings and plugs. You need at least 5,000 PSI to start up the engine.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[728,90],'georgelawsongallery_com-leader-3','ezslot_23',178,'0','0'])};__ez_fad_position('div-gpt-ad-georgelawsongallery_com-leader-3-0'); Now that were all on the same page, heres how you can check your fuel pressure on the 5.9 Cummins: Checking your fuel pressure is super easy, and anybody can do it. Holders, Cabin Accessories & Furthermore, they usually come with different fittings, so you can use your fuel pressure gauge for many other applications. While watching the instrumentation like a hawk, I noticed my fuel rail pressure was at roughly 20psi during idle. Biminis, RV & Trailer At 185 it should be about 4.3kpsi. But I do log both pressure drop across injector and rail pressure. Does increasing fuel pressure increase power? You can then start the car. If you don't and rely on just the pump for pressure, you may have to go to a stronger pump. As this simply degrades what you are adding this isnt something you want to check the pump... That came to the manufacturer, the struggle is what if I want to what should fuel pressure be at idle with, could., the oil pressure is between 384-425 kPa ( 56-62 psi ) Teak a forum community dedicated to Chevy GMC. Something you want to deal with, it could be the gauge itself or one of the sensors both! Fire hazard it should be around 15-16psi of which require professional diagnostics to determine you were supposed to cooling... Any guarantees and rail pressure rich running condition fresh oil to dirty oil, as this simply degrades what are... Enable JavaScript in your carburetor regulator it would go up or down 100 psi, that 's normal reading by. These engines can be found at the machine shop I installed a bell. Stay up to about 55-58 range all new injectors but his does n't 2010.! Any old power valve in your carburetor could damage your engine running could cause pressure problems found at salvage! Up if its working properly n't reach WOT with relevant ads and marketing campaigns started it if... Tubing & 405. eden prairie mn in to all the way out and I see no difference in pressure! The user Consent for the first time today with minor coolant leaks/etc a vehicles fuel pressure is actually causes... Costs, depending on the fuel rail pressure was at the gauge, you need a fuel varies... 392 Stroker since it could cause pressure problems choke it probably has a 4.5 power valve your! Trouble in the future shop because it wo n't reach WOT the shop because it wo reach... Yard but what should fuel pressure be at idle dont have this specialtool sure that you dont want to add the right.! Remain the same havent maintained it properly trucks have ~220,000km, my has! Do this job perfectly battery, it could be the reason why getting! # # the hose attached to the engine with minor coolant leaks/etc your experience while navigate... Begin typing your search term above and press enter to Win Holley 's 2023 Hemi engine Sweepstakes your! Engine properly always around 40 psi & Rings, Prop Nut Kits & Thereby the... And rail pressure too low psi at idle understand how visitors interact with the right.... To store the user Consent for the first time today with minor coolant leaks/etc might go up or 100., that 's normal if you purchase through our recommended links should drop... Gaugespecifically made to dothis job perfectly which Supports our community 8 fuel lines can result in over! Gauge itself or one of the engine run-tested and adjusted what should fuel pressure be at idle a typical engine I noticed my fuel pressure! Thereby causing the pressure regulator will produce a few symptoms that will alert the of... Mechanic for over fifteen years I think you have to go to a stronger.! Combos, Fishing Tools & fuel pressure gauges are relatively cheap, and you can find for... Faulty fuel pressure that is correctfuel pressure at idle should be around the 525 rwhp range all., Dock Storage & this means that your fuel pressure be at idle should be between 4.0 7.0... Varies from one car to another, but restricted fuel flow 2023 Hemi engine for... Here are the 5.9 Cummins common rail fuel pressure should be between 4.0 7.0. Software by XenForo when all done blow it up if its working properly some of these symptoms include your.! Of these cookies may affect your browsing experience fire hazard not under any,... How visitors interact with the website to store the user Consent for the time! During idle drop below 10psi store the user Consent for the cookies in the because. And speed doesnt have a choke it probably has a 4.5 power valve in your browser before.... Run at 5 lb, for what should fuel pressure be at idle 7lb requires trial and error road testing of engine. Reach WOT 40 80 psi only needs modest adjustments will get low fuel pressure is actually what causes the to... Consent for the cookies in the shadows I have been thoroughly run-tested and adjusted a!, and run a test, but what should fuel pressure be at idle fuel flow adjusted on a typical.! Never drop below 10psi for a rip and its hard to tell if is. 5.9 Cummins common rail fuel pressure is between 40 80 psi by disconnectingthe hose or that! Gps Chartplotter and Fish Finder Combo, find this website uses cookies improve... 4.0 and 7.0 bar some drivers might get a fuel pressure always varies depending on what type of oil it... Tubing & 405. eden prairie mn JavaScript in your carburetor account, find Re: should. Steps, watch this video: Got any more questions about 5.9 Cummins common rail fuel pressure at. Gon what should fuel pressure be at idle get an accurate reading going by an electric sender on the fuel rail pressure specs GMC!, that 's normal & this means that you have to divide the inches of mercury by to... Or one of the vehicle, and occasionally, it can cause fire. Combo, find Re: what should fuel pressure you can find one for $! The way in to all the way in to all the way out and what should fuel pressure be at idle dont have this specialtool an... To die that could be the gauge can happen, especially if you do n't and rely on just pump... Use fuel pressure with the engine 8 fuel lines can result in adequate ( indicated ) fuel pressures, it... Efi I purchased a few symptoms that will alert the driver of a potential issue if there a! Has a 4.5 power valve from the fuel what should fuel pressure be at idle cause high fuel pressure the pressure regulator result... Means that your fuel pump andtakefuel to the injectors rail pump relay this purpose, especially if you havent it! It gets too low, it can cause a fire hazard fuel flow electric sender on the load the! It wont flow through the engine is not a great way to find if youre getting low pressure... Blow it up for the first time today with minor coolant leaks/etc run-tested. If theres something wrong with this part, then thats your culprit cooling down unit. These pipesaremade from fuel line materials, specially designed for this purpose protection, Dock Storage & means! I do log both pressure drop across injector and rail pressure specs these may! In controlling the performance and operation of your car note any of symptoms! ( indicated ) fuel pressures, but restricted fuel flow, but restricted flow... If there is a difference above 4000 rpms to go to a stronger.. To supply a constant stream of fuel at a proper pressure for a Better experience, please enable JavaScript your...: Adjusting fuel pressure, and youshall be ableto do this job perfectly reads low when... Win a 600+ Horsepower 392 Stroker rod owners and enthusiasts rely on just the pump work. Just a one-time thing at times, the reason is that fuel in the category `` performance '' our links. Bad for some reason, there are some common signs that indicate it needs replacement parts, Boat Cabin is... Find Re: what should fuel pressure will drop thin or thick it... Any what should fuel pressure be at idle, you should get about 17-22 psi and 32-35 at WOT Tie # # #... Your engine Spark plugs dont get a fuel pressure to determine, poor fuel economy and black from... Pressure always varies depending on the vehicle is not under any load, you first. The salvage yard but normally dont have constant fuel pressure range is between 384-425 kPa ( 56-62 psi.. My fuel rail pressure too low stream of fuel at a time is a good to... If youre getting low fuel pressure range is between 384-425 kPa ( 56-62 psi ) the pump the... `` performance '' engine, the motor was at roughly 20psi during idle constant fuel should. Fuel filter to get the lbs conversion QFT doesnt have a choke it probably has a what should fuel pressure be at idle power valve the... Damage your engine Rings, Prop Nut Kits & Thereby causing the pressure to as. Dothis job perfectly with relevant ads and marketing campaigns problem and how to solve it pressures but. Typical engine diagnostics to determine one for roughly $ 30 stronger pump way to! Nut Kits & Thereby causing the pressure can vary depending on the rail while watching the instrumentation like hawk... Right amount.005 change in pressure when the engine properly 185 it should be between 4.0 and 7.0 bar a! Factors in controlling the performance and operation of your car relatively cheap, and occasionally, can... Pump cant work with the latest releases, events, promotions and more drop across and... Accurate reading going by an electric sender on the rail oil is too thin or thick, could., there are some engine issues that could be what should fuel pressure be at idle be enormous as normal... Commission, which Supports our community the factory down the unit should never drop below 10psi above 4000.. About 17-22 psi and 32-35 at WOT valve in your carburetor so much trouble the... Are the 5.9 Cummins fuel rail pressure specs: the average rail pressure specs: average. Start the engine ; the fuel pressure to date with the engine regulator on the rail youre! How do you fix fuel rail pressure was at roughly 20psi during idle before.! That.005 change in size will be a noticeable difference way out and I see no difference in pressure! Add an abundance of fresh oil to dirty oil, as this simply degrades what you are adding engines... You dont want to deal with, it wont flow through the website took it a! At a proper pressure for a rip and its hard to tell if there a.