No fuel past FPR with brand new FPR

  • 1990 NISSAN 300ZX
  • 3.0L
  • 6 CYL
  • RWD
  • 100,000 MILES
Have a NA 1990 300zx that doesn't seem to be getting fuel past the fuel pressure regulator. I just bought a new pressure regulator and installed it in hopes that would fix the problem but it still doesn't have any pressure past the regulator. When I got the car just about all the rubber in the engine bay was dry rotted so I have replaced all the vaccum, fuel and water lines. I also did aiv, prvr and egr delete to simplify the engine. I have the vacuum line that goes to the FPR going to the plenum as instructed in multiple forums I have read for doing the aiv and prvr solenoid delete. Only thing I can think is that the plenum isn't creating enough vacuum to open the diaphram in the FPR but I dont know how to fix that. I can spray starter fluid in the plenum and the car will start up till it burns off the starter fluid just so you know.
Do you
have the same problem?
Tuesday, August 30th, 2016 AT 7:52 AM

1 Reply

Try using a miti-vac to open the fuel pressure regulator then check vacuum at manifold once running it should have about 20" at idle. you may have a bad pump so check that withour vacuum it should have 43 psi with vacuum 36 psi if it doesn't have either then it's a bad pump. check at fuel rail and you may need an adapter.
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Tuesday, August 30th, 2016 AT 10:17 AM

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