1993 JGC 5.2 Liter V8 Limited. Having issue with keeping the fuel pressure up in the fuel rail. Using quick start the engine can be made to run after a quite few tries, runs nice, too, though it won't start-up after sitting over night, but will keep fuel in the rail for only a few hours and starts right up in that time and will run endlessly. But if not started every few hours, all the fuel seems to drain from the rail and back to the tank. There doesn't appear to be any fuel leaks and no strong smell of fuel. I am hoping someone might have a suggestion that I have not thought of. Fuel pressure regulator , although I have no means to actually test it, and it's vacuum seems to be fine. It is a 1993 5.2 so the FPR is on the back end of the fuel rail and has a vacuum going to it from the intake manifold. Perhaps it is the fuel pump? Might it cause such a thing if it's on it's way out? Any advice or a point in some direction would be greatly appreciated.
Love the forum, by the way. Great resource and lots of great people. Thank you for any help you might offer. Have a nice day.
It sounds like you have a possibility of leaky injectors leaking into the cylinders and flooding the engine. If it runs good then perhaps you have a good fuel regulator. On the other hand your check valve could have gone out, but it should start and run without a check valve. Something to check anyways.
It will start after being primed, either with alot of tries with quick start of priming the line. And then, after many tries of it starting, idling for a few seconds, it will run normally, lots of power then and getting plenty of fuel, drives fine once it is running and does not stall. But after a few hours of sitting it will lose it's prime and the rail will have no pressure and the whole process must be done again for it to start and run again. Thanks for the suggestions. I am going out to check out the check valve in a bit. Thanks again and have a nice day and happy jeeping.