1993 Jeep Grand Cherokee fuel leakdown problem.
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.
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