Fuel pressure question?
11-09-2012, 03:58 PM
#1
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Year: 1999
Model: Cherokee
Engine: 4.0
Fuel pressure question?
Okay so the specs for fuel pressure are 31 with the vac line on the regulator and 39 off. My question is how much of a buffer in being good is there? For instance mine is 32-34 with the vac line on and 40-43 with it off. It is not fluctuating but just tests a little different depending on the guage.. I have tried two different guages on this. Any help is appreciated! Oh yeah it's an 89. 4.0 auto
11-09-2012, 05:49 PM
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Year: 2000
Model: Cherokee
Engine: 4.0L with throttle body spacer and cold air intake, bored throttle body, #784 injector upgrade
The spec's tell you what the best / lowest pressure for operating is. If your fuel pressure is at or a little above them your fine. From what your readings are your fuel pump and fuel pressure regulator are working.
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