2001 4.7 WJ Quadradrive. Started having to crank 2-3 times to start after it sat, and then it would start fine.
Replaced the fuel filter, no real improvement; replaced injectors, no real improvement, checked fuel pump pressure, and got 50 psi, but this was shortly after having started it.
I waited til the next morning, and rechecked the pressure at the fuel rail, and got:
- 10 psi at first key on
- 25 psi at second key on
- 50 psi at third key on
So I figured the fuel was draining all the way back to the tank, due to a bad o-ring or check valve.
Fixing the o-ring or replacing the pump is a pita.
I bought a Dorman fuel check valve ($40) and installed it in the line from the tank to the fuel filter, took about half hour.
Since then, instant start, idles smooth, runs great.
I think this is a quick, easy, inexpensive fix for a troubling problem.
Replaced the fuel filter, no real improvement; replaced injectors, no real improvement, checked fuel pump pressure, and got 50 psi, but this was shortly after having started it.
I waited til the next morning, and rechecked the pressure at the fuel rail, and got:
- 10 psi at first key on
- 25 psi at second key on
- 50 psi at third key on
So I figured the fuel was draining all the way back to the tank, due to a bad o-ring or check valve.
Fixing the o-ring or replacing the pump is a pita.
I bought a Dorman fuel check valve ($40) and installed it in the line from the tank to the fuel filter, took about half hour.
Since then, instant start, idles smooth, runs great.
I think this is a quick, easy, inexpensive fix for a troubling problem.
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