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This may not be a fuel pump issue. Leaky fuel injectors will cause pressure to bleed off and lengthen crank times. You can check for sooty spark plugs. Low pressure fuel pump should be making 5 bar ~75 psi not 101. LP fuel sensor may be bad or failing. ISTA has a test plan for this but requires you to install fuel pressure gage to check LP sensor calibration. For HPFP, 5MPa=50bar and this is acceptable at idle. Check at WOT. My N54 HP fuel pump makes ~160 bar at WOT.
Last edited by pshovest; 06-16-2021 at 07:26 PM.
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