Question about 1993 Jeep Grand Cherokee

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On the Grand Cherokee with the 4 cylinder, what is the proper fuel pressure? I currently have 35 psi. Is that enough?

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31-39 psi. That is enough, within the specs.

Posted on May 15, 2010

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35 is pretty much OK...should be 5-8 psi higher with vacuum line disconnected from the regulator. 4cyl in a GC? Do you push it up hills?

Posted on May 15, 2010

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Hi.

If fuel pressure is low and you have already replaced the fuel pump, then the problem is usually the fuel pressure regulator. The pressure regulator is in same assembly with fuel filter. The assembly is located to the fuel tank, bolted to the truck's frame. The pressure is tested connecting a gauge like this : Set Sealey VSE952 to the port on the fuel rail. The pressure on Grand Cherokee must be around 49 psi plus or minus 5 psi. If engine runs but pressure is below 44.2 psi , check for a blockage in fuel supply line between fuel rail and fuel pump module (e.g.kinked line). If the line is not blocked, replace fuel pressure regulator and filter. Test pressure with and without fuel cap on.

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Below a diagram representing the fuel rail and test port. The engines from same years like your six cylinder have the port and rail in the same position.


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Regards.

Ginko

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Thanks dodge tec

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