You can post accurate info and not get rebuffed. E53 FPR regulates to 50psi.

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There's literally nobody that knows more about e53 fuel supply sorry if it bothers you facts don't care about feelings.

OMG You sure are full of it!

Prove me wrong. I'm correct you are wrong. PSI the same before and after FPR. Nice try. What exactly other than actual facts about e53 fuel supply am I exactly "full of"? My fuel pressure gauge showing 50 psi on the fuel rail of a running e53 is all the facts needed for my case where you said it's set to 40 is incorrect. I'm going to correct errors like that. People correct me if I make a mistake it doesn't get me bent out of shape. Happened a month ago and my reply was "nice catch" not an ignorant ad hominem. When I know what I know I'm going to represent with confidence. I've spent at least 50-60 hours studying the e53 fuel supply and "wrote the book". If you find an actual error I will update my book. Unless you have something correct and positive to say what's exactly your point?

I have explained how the system works to you before but you are too full of yourself to admit that you are wrong. What ever the gauge reading is when the pump shuts off is what the regulator is set to--that's a fact.

Pressure at the pump and at the rail are the same unless there is flow and some restriction at the fuel filter--- that's a fact.

The return from the regulator feeds the syphon jet so any pressure that adds gets added to the regulator pressure--- that's a fact.

If you have a look at the syphon jet relief you will see that there will be fuel coming out of that because in order to have the syphon jets working reliably there needs to be more than enough flow when everything is new--- that's a fact.

No one knows more than you about the E53 fuel system--- BS

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Care to explain why Bosch doesn't agree with you?

3.5 bar is 50.8 psi. The value you will see while the pump is running and definitely NOT the ≈ 45 psi you'll see immediately after turning off the pump.

That value is just what remains when the check valve closes after the pump turns off. Where do you get this stuff?


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Pressure before the FPR is absolutely more than after the FPR. Also the return line is only about 20 psi.

If you were correct about the pressure relief on the return/siphon then cars wouldn't starve of fuel from the return gas going to the left tank. I've never seen evidence of flow from the pressure relief under normal n conditions. You have actual proof I'll update "the book".

When fuel is below 1/3 tank the return line goes to feed the siphon jet. If it went directly to the pressure relief you'd never get the gas from the left tank.

Even if all the fuel pumped (minus the fuel the engine used) went back to the pump the car would starve without the syphon jets working. The syphon jets are fed all the time not just below 1/3 tank. Are you serious?

Above 1/3 tank the two sides of the tank are connected so it doesn't matter if the fuel goes to right or left. So yes, for real.