i just replaced my oem fuel pump because it maxed out with my sc setup S50 engine.
i found a F01 740 intank fuel pump. so i installed it .
the car run but perfect and AFR is ok but today i checked the fuel pressure and i noticed that fuel pressure at idle is 4 bar and it should be 3 bar at idle??? vacuum hose connected to the FPR and there is a 17inhg..
why it happend?? the fuel pressure should stay 3 bar at idle also if i installed a 20bar fuel pump right???
what could cause this problem?!
Too much fuel flow for the FPR to be able to drop the pressure?
Matt Cramer
1997 BMW 328i convertible, 1972 Chevy C10 pickup, 1966 Dodge Dart slant six
BMW - where "Why doesn't everybody build cars the way they do?" meets "Why can't they build a car the same way everyone else does it?"
Yes.
The problem sounds like the FPR can't handle this fuel pump.
Matt Cramer
1997 BMW 328i convertible, 1972 Chevy C10 pickup, 1966 Dodge Dart slant six
BMW - where "Why doesn't everybody build cars the way they do?" meets "Why can't they build a car the same way everyone else does it?"
i installed an adjustable FPR and set the pressure to be 3.5bar with vacuum hose disconnected and 3 bar when the vacuum applied.
but i installed a cheap fpr 30$ from ebay?? anyone tried it???
http://forums.bimmerforums.com/forum...re%20regulator
^^^^Do this and be done!
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