91 nissan pathfinder lossing fuel pressure in idol then dies how do i find the problem

1991 NISSAN PATHFINDER
100,000 MILES
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SCOTTSCOTT07
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Vehicle dies in idol after the engine warms up. The person i bought it from told me he replaced the fuel pump and i even have the receipt, so im not sure if its the fuel pump or something else to cause the loss in pressure.
Oct 17, 2011 at 8:25 PM
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DAN_K
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I would begin this diagnosis by checking the fuel pressure. A gauge can be found for rental at most good autoparts stores. Was the fuel filter replaced when the pump was? It's also possible that the fuel filter may be plugged.
Oct 17, 2011 at 8:55 PM
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SCOTTSCOTT07
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Fuel filter looks new and i just had a pressure test done by a mechanic and he said that my brand new fuel pump needs to be replaced i just bought a pressure gauge but im not sure how to hock it up they way im suppose to its only a single hose gauge but i'm suppose to hock it up so my line still conects to the engine
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Oct 18, 2011 at 7:58 PM
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DAN_K
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Some fuel rails have a test port called a schrader valve. If yours is not equipped with one, you would have to tee into it. Trust the mechanic that took the fuel pressure measurement. Sometimes even new ones are faulty.
Oct 18, 2011 at 9:15 PM