Quote:
Originally Posted by hoaxci5
I've got a fuel pressure gauge installed. I know the pressure is dropping, and if I let off the pedal it rebuilds. With it being intermittent I'm not sure doing any measurements at the filter will tell me anything.
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Are you saying that the pressure is dropping anormally?
If yes and it rebuilds when you let off the pedal then it could be a blocked vent or gas cap. The rebuilt could be that air has to get inside the tank to replace the fuel but this process is being slowed by a blockage. I am no expert, so it is my guess.
I replaced my fuel pump last summer since it failed. I changed at the same time the two vents ontop of the gas tank and the gas cap.
Two months ago my Mercedes 2010 fuel gauge was suddently at zero after being 10 minutes on the road. I ordered a new gas cap on rockauto and it fixed the problem. Problem did not come back. It means the air pressure can have consequences.