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Old February 21st, 2006, 21:10
alky350's Avatar
alky350 alky350 is offline
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Fuel pressure too high?

Is 49-52 psi to much fuel pressure on the fuel rail when at idle? this is for a 96 grand cherokee laredo. 4.0L. I trying to figure out why my moms ride keeps stalling or wanting to die when coming at a stop. when its at idle it sometimes rough idles and then goes back and forth. just want to make sure that too much fuel pressure is not causing this. my dad has replaced coil, spark plug/wires, tranny fluid/filter, fuel filter and pump. crank position sensor. is too much fuel pressure bad? i read it should be around 37-41 psi. thank you!
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Old February 22nd, 2006, 07:41
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Dr. Dyno Dr. Dyno is offline
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Re: Fuel pressure too high?

The '96+ 4.0 should run at a fuel pressure of 49psi so it's normal. The figure of 39psi applies to '95 and earlier Jeeps.
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Old February 22nd, 2006, 12:19
my65289stang my65289stang is offline
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Re: Fuel pressure too high?

I have 50PSI at the rail in my 96 4.0 and my chilton said something like 39 or 35PSI at idle and if you remove the vaccum line to the pressure regulator, it should jump to around 50. I have seen posts both ways, some say 50 is too high, some say that it should be 50 at idle. Hopefully someone can clarify....
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