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Electrical issue with fuel system. Need help

300ZX (Z32) Forums Dedicated to 90-96 ZCars otherwize known as the Z32's

Electrical issue with fuel system. Need help

Old 04-29-2017, 06:19 PM
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Join Date: Apr 2017
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Electrical issue with fuel system. Need help

I'm the proud new owner of a 107000 mile nissan 300zx twin turbo, but I will say so far the relationship hasn't been pleasant. When I purchased the car previous owner stated it needed a fuel pump it ran, but took some time after started to run correctly. Long story short I believe I have an electrical issue. I can say without a doubt that the fpc is shot, when bypassed the car fires right up and runs great, but here is the kicker in the process of diagnosing this issue I have seemed to lost signal from the ecu to the fuel pump relay. (Pin 18). With some more diggin I found that from the relay back to the ecu I'm getting voltage and not ground. It's my understanding that the ecu sends a ground signal to relay. I have all the proper voltages at the relay. When I manually ground pin 18 relay clicks in and pump primes. Why would I be getting voltage back from the relay into the ecu?
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