sherrod624

i have a 93 p/u v6 and my fuel system is loosing pressure after i shut the motor off. Ive already replaced the fuel pump and the fuel pressure regulator and just dont have the time or money to "fix" the problem now. or for that matter, find out what the problem is. i know its not leaking fuel outside of the vehical. so im guessing its either injectors or something in the tank. so for the time being i put a jumper wire in the diagnostic port so that the fuel pump will come on when i turn the key, without starting, so that it can build up pressure before i turn the motor over. so the question again is, is it safe to do this?

thanks for opinions

nick

DeathCougar

iTrader: (23)

Your fuel system has a return line, so it should lose "pressure" after it shuts off.

It shouldn't, however, drain back into the tank. Leaving a jumper wire in the port is just asking for trouble. These sort of threads are the ones that are followed by "so my truck burned to the ground...WAT DO?!" threads.

sherrod624

it should keep prime at the motor though, correct? as in every time i go to crank my truck it shouldn't have to pump fuel all the way from the tank up to the motor. it should hold fuel in the supply like at the motor?? mine does not. if i cut it off and let it set for 5 mins the pressure will have dropped and it will take 10-15 seconds turning over to crank. when i use the jumper wire, let the fuel pump build pressure, it will fire right up, no problems. maybe i did a poor job of putting the hoses on the pump in the tank, and its draining fuel back there. how can i tell if its draining at the injectors??

DeathCougar

iTrader: (23)

That isn't a problem with fuel not being there. That is a hot start issue.

You might also check to make sure you have your fuel return line hooked up correctly.

sherrod624

could you elaborate a little bit??

ive done a little more researching on leaky injectors and that sounds a lot more like my problem. first thing in the morning my truck will crank fine. but the rest of the day it requires a lot of turning over.

but why would it crank better when i let the fuel pump build pressure before i crank? that doesn't change the cylinders from being flooded

also , how do i definitely diagnose leaky injectors and how hard are they to change