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Author Topic: HOW TO DIAGNOSE BAD FUEL PRESS REGULATOR S4OSHUS ¯ Member # 2918 posted                              how do you know if your fuel pressure regulator is bad. i have an adjustable one and when at idle with vacumm connected and reved passed 1k rpm, it starts dropping from 40 to about 36psi. is that normal? then, when at idle and i unplug the vacumm line, pressure rises. i think that part is normal but not the drop at high rpm. anyone run into this same problem? -------------------- 2001 audi s4 avant stage 3. 460 whp e85 2001 audi S4 stage 3 sold! 91 lx 347 sold! 90 lx notchback sold! 99 cobra sold! Posts: 695 | From: FRISCO | Registered: Jun 2003  |  : BlackNGold CaliforniaFords.com Moderator Member # 655 posted                              Sounds normal... You test the FPR by making sure the fuel pressure changes when vacuum changes...You also wanna make sure there is no fuel leaking from the vacuum port in the FPR.... -------------------- -SLOWER TRAFFIC KEEP RIGHT- Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001  |  :

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