Fuel pressure increased after replacing the fuel pump... amazing

[aimanad]

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?!

[Matt Cramer]

Too much fuel flow for the FPR to be able to drop the pressure?

[aimanad]

Too much fuel flow for the FPR to be able to drop the pressure?

so the problem is fpr or fuel pump?
thanks

[Matt Cramer]

Yes.

The problem sounds like the FPR can't handle this fuel pump.

[aimanad]

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???

[bawareca]

but i installed a cheap fpr 30$ from ebay?? anyone tried it???

You did and obviously it doesnt work.

[aimanad]

You did and obviously it doesnt work.

Until now it working fine but need to know if anybody here tried this cheap fpr

[Cyrix2k]

You either need a better FPR rated for more fuel flow OR a smaller fuel pump.

[NY98M3]

http://forums.bimmerforums.com/forum...re%20regulator

^^^^Do this and be done!

[aimanad]

http://forums.bimmerforums.com/forum...re%20regulator

^^^^Do this and be done!

Thank you its the same problem .
Got solved by installing adjustable fpr