Re: 98 V6 Fuel pressure drops after Key On Engine Off
If you're trying to run the fuel from a small can, the volume of the small can cannot sustain the pressure required for any length of time, if I read your post correctly.
If fuel pressure is dropping after pump shutdown, either the regulator is bad or the check valve in the pump is leaking, or pump is bad.
If the car runs fine, I wouldn't worry about it, IMO. As long as the pump can supply fuel, then it should be good. This is why the pump primes the fuel system at first start.
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