it will only start with starting fluid but will not hold idle once it is started. it will stall if you don't press the gas pedal. i have been searching the web with no luck. the fuel pump is new and working fine. all fuses checked. i'm suspecting its the fuel pressure regulator since it starts with starting fluid. any help will be wonderful.
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Originally posted by jlevie View PostCheck the fuel rail pressure to see if the FPR & pump is working properly. But my guess on the cause would be intake leaks. A smoke test will find them.
+1 on this.
Other cheap/free tests:
You can do a noid light test on the injectors to see if they are firing. Fuel pressure check and noid light test are both easy and very cheap (or free) to do and can provide great troubleshooting information.
You can also pull the fuel line after the FPR (and put it into a container to catch fuel) to see if fuel is moving through the system. This is another easy and free test to see if you're getting volume. Doesn't provide much info other than yes/no you have volume. Just remember, correct volume doesn't necessarily mean correct pressure.
Also also, you can pull the vacuum line that runs from the intake to the FPR. If it has fuel in it then the FPR is likely bad.90 325i DD/Track
03 Durango 5.9
Originally posted by e30mpgIt is recommended to get new gasket but this is R3v and we just copper spray that shit......slap biotch on and tighten to tq.
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Originally posted by Chriskbmx View Postalso don't forget your fuel filter!
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Originally posted by 603Racing View Post]
+1 on this.
Other cheap/free tests:
You can do a noid light test on the injectors to see if they are firing. Fuel pressure check and noid light test are both easy and very cheap (or free) to do and can provide great troubleshooting information.
You can also pull the fuel line after the FPR (and put it into a container to catch fuel) to see if fuel is moving through the system. This is another easy and free test to see if you're getting volume. Doesn't provide much info other than yes/no you have volume. Just remember, correct volume doesn't necessarily mean correct pressure.
Also also, you can pull the vacuum line that runs from the intake to the FPR. If it has fuel in it then the FPR is likely bad.
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Originally posted by mr.vang View PostI just pulled the vacuum line you mentioned and its bone dry. So the fpr is good then
It's also good that you have fuel volume, but again, it doesn't mean you have good pressure.
Noid lights can be rented from most auto parts stores. You connect them to the individual fuel injector connectors. The noid light should light up when the signal is sent to the injector. You can google it, lot's of info and videos out there.90 325i DD/Track
03 Durango 5.9
Originally posted by e30mpgIt is recommended to get new gasket but this is R3v and we just copper spray that shit......slap biotch on and tighten to tq.
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Originally posted by jlevie View PostThat could be the FPR, or it could be that the pump isn't running when the engine is turning.
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The fuel pump only runs when the DME sees timing data from a rotating engine.
Sudden thought... Where did you measure the fuel pressure? The measurement must be done by tee'ing in the pressure gauge to the hose that connects directly to the fuel rail.The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, AL
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Originally posted by jlevie View PostThe fuel pump only runs when the DME sees timing data from a rotating engine.
Sudden thought... Where did you measure the fuel pressure? The measurement must be done by tee'ing in the pressure gauge to the hose that connects directly to the fuel rail.
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Zero pressure at the rail supply and a dry return line from the FPR when the engine is cranking or the fuel pump relay is jumpered says that; a) the pump isn't getting power, b) there is an obstruction in the supply line, c) the pump is bad.
The way the system works is that the pump supplies more fuel than the injectors can use and at a higher pressure than the FPR's rating. The FPR bleeds off the excess pressure to result in the rail always being at correct pressure.The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, AL
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