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Old 02-19-2020, 06:58 AM   #1
pjmcfarlin12
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Aftermarket Fuel Pressure Regular

Iím currently working on a turbo build for my 04í 330ci. Iím going to be running bigger injectors and bigger fuel pump for E85. Iím curious to see if anyone has installed a after market FPR on their set up. I know BMW has one on the fuel filter. But I want to delete it and add my own. Much help needed. Thanks !


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Last edited by pjmcfarlin12; 02-19-2020 at 07:00 AM.
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Old 02-19-2020, 07:29 AM   #2
MrMCar
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BTDT many times in the past, albeit not on a E46/M54.
You may need to swap in a fuel filter from a 5 or a 7 without the FPR attached to make things simpler.

Also a straight increase in fuel pressure might work, depending on the size of the turbo, boost level, size of injectors etc. Something to keep in mind:
A "Rising Rate" FPR maybe (?) a better solution in the end.

Rising rate gives a slight increase at low demand and climbs a slope as demand increases. Available in several ratios.

You'll also have to keep in mind some of the architecture of the fuel system as it was designed: Running Losses, and Suction Jet function.
R-L = unused fuel being sent back to the fuel tank just after the fuel filter. There is only one (supply) line to the injector rail.
S-J = The fuel being returned to the tank helps move fuel from the dead side back over to the side where the fuel pump lives.

Good luck.
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Old 02-19-2020, 07:46 AM   #3
pjmcfarlin12
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Okay thanks for the info! Iíve been reading around and I saw where a few people say itís difficult to do because of those factors. Thanks


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