TwinTurbo.NET: Nissan 300ZX forum - Fuel Pump/ Pressure Issue
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Subject Fuel Pump/ Pressure Issue
     
Posted by Roundabout136 on July 17, 2011 at 1:17 PM
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Message Codes: 55
Car: 94 n/a - 87k miles

Car cranks and starts and instantly dies. All vac lines were recently replaced and in tact. Car seems be firing on all cylinders during the little time I can hear it running. I can keep the car running by pressing the throttle, but as soon as i let off it dies.

Tested fuel pressure and it sits right around 40psi. Dies down to 30psi within an hour. If I pinch the return line it will sit at 60psi, and when I release the return line pinch, it shoots down to 40 and maintains it for a little bit.

I replaced the FPR a year ago due to the same problem, and I can't really imagine it has failed again...

***Tested the fuel pump connector and it's reading lower then the 5 OHM it requires.

I got right around 3.3 OHM's.

Would the fuel pump be my problem? It has made a beeping noise for quite some time now when priming, on and off, with the normal pump noise going on as well.


     
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