Fuel pressure test port sprays air
97 Jeep Grand Cherokee with 4.0L. I have been having problems with intermittent sputtering and stalling under load. To check for fuel pressure I pressed in the shrader(test port on fuel rail) valve and noticed a spray of fuel and air rather than a solid stream of fuel. Is this common? Also, no codes have occured which is odd and makes diagnosing the problem VERY difficult.
Did you check the pressure with a gauge? There will be a quick shot of fuel if you just press the valve, but not a constant flow. As far as the air, not sure. Don't remember if your '97 has an inline filter or not, but if it does, when was the last time you changed it? Post up your pressure readings. BTW, leave the gauge hooked up and shut down the Jeep. Wait a while and make note of pressure drop, shouldn't be significant.
93 Laredo 4.0
96 Limited 4.0
Originally Posted by murphydajeep View Post
I have measured with a gauge and read 45psi with engine running. Fuel filter is part of the fuel tank module and was changed with fuel pump. And pressure is maintaned for awhile after shutting off engine.
What brand of fuel pump was used as the replacement? Personally I doubt that its the fuel filter, I recently discovered that my fuel filter was likely more then 10 years old after I ended up cutting it out of the bracket and the only symptoms I had was that I had to shove the pedal harder to accelerate, and mileage sucked. 45 Psi sounds a bit high though, but they might have changed the specs between the 4.0 and the 5.2, or 93-95 and 96-98.
If a week goes by without needing to replace something, pinch me because I must be dreaming.
|4.0l , fuel , pressure test , stalling|
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