Guest ZmeFly Posted March 17, 2004 Share Posted March 17, 2004 I have a 83 280ZXT, with ic @ 15#'s of boost. I didnt run the car down the road to test this as I was to worried about a line bursting and fuel going everywhere. When I tested the fuel pressure using a know good pressure gauge, I had gotten a reading of 48psi @ idle. When manually reving the engine to about 3-4k rpms, the pressure dropped to about 40psi. The FPR that is on there is the one I got with the car, it is NOT a nissan or aftermarket equilvelant thereof. I dont know what it is off of. My AFPR took a shyte on me so I had to put this one back on. Now correct me if Im wrong but as you manifold pressure approaches a positive point (ie boost) should pressure rise instead of fall? I also removed the vacumn to the FPR with no noticeable change, would this mean that it is bad as well? At least now I know why Im running so rich at idle. Quote Link to comment Share on other sites More sharing options...
Guest 81na ZX Posted March 17, 2004 Share Posted March 17, 2004 It SHOULD be at the lowest point when you make the most vaccum (i.e. idle). It also should raise when ever the vac is lessened/boost made. Example - lets say the FPR is set at 42.5 @ 0psi (no vac line), at idle it sould be somewhere around 35-38 (given a 1:1 rate). At 15psi, you should see 57.5psi fuel. That said, I'd say your FPR is toast. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted March 18, 2004 Share Posted March 18, 2004 Ditto, FPR cannot pass the fuel volume at idle. Quote Link to comment Share on other sites More sharing options...
Guest ZmeFly Posted March 18, 2004 Share Posted March 18, 2004 Thanks for the input guys, I thought as much, no wonder I was running pig rich at idle. Quote Link to comment Share on other sites More sharing options...
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