Rev383 Posted August 28 Report Share Posted August 28 Car is studdering up top finally found two issues I’m not sure which it is. I vacuumed tested my FPR 10 mins at 10lbs zip tied everything loses a lb a minute. Also did a fuel pump change and got a faulty pump so I put the old one back it’s a walbro 255. I worm clamped back together. I drive it get a good pull then nothing after that and the idle fuel pressure is 30 Quote Link to comment Share on other sites More sharing options...
kev Posted August 28 Report Share Posted August 28 It may be worth changing the FPR, although I'm not sure that is your problem. Have I ever checked a stock FPR for leakdown with vacuum?....no. Although, the fuel pressure does drop with time. If it is building 30 psi at idle, it seems to be functioning. You could consider putting a 'whip' on your pressure gauge such that you can route it up to the windshield to monitor it while driving. You could put some washers under one of the hood hinges to give you enough clearance to pass the hose through. I wouldn't recommend running the hose through the firewall being that it would be pressurized with fuel. MKS sells replacement adj rate FPRs. There is also a company called SPAturbos that sells them...which look identical to the MKS ones (not sure the true source). Although I saw some people lately complaining that the mounting studs were incorrect on the SPA ones....but I have one of these and had no issue (mine was installed last year...sounds like they are having a recent quality control problem) For only $15 difference, buy from MKS and support a SQC member. When I bought mine, there was a larger price delta. Both places use to have a non-adjustable version but I don't see them anymore on either page. Dodge Conquest / Mitsubishi Starion Fuel Pressure Regulator FPR – SPA TURBO USA G54B Adjustable Fuel Pressure Regulator - MKS Motorsport 1 Quote Link to comment Share on other sites More sharing options...
psu_Crash Posted August 30 Report Share Posted August 30 I agree with Kev. Get a mechanical gauge and then you can watch pressure in real time. Or go all out and intall an electrical unit and mount he gauge inside permanently. That's what I did. Usually the FPR either works or it doesn't. Seeing it bleed off over 10 minutes sounds just fine to me. Quote Link to comment Share on other sites More sharing options...
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