IN tank fuel pump upgrade questions

E28 technical advice asked and given! Troubleshooting, modifications and more.
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EE TWO EIGHT
Posts: 267
Joined: Aug 10, 2010 5:20 PM
Location: The outback of the southwest

IN tank fuel pump upgrade questions

Post by EE TWO EIGHT »

So I have done the upgrade of the in tank pump based on reading and or watching some do it. All I have seen are a tad vague on what I do to bypass the external pump. Do I just go directly from the hose from the new in tank pump to the inlet of the new fuel filter, and out of the fuel filter as normal to the line which runs to the FPR? I have yet to try this because I am removing my fuel rail, injectors, and FPR so i can replace the FPR, and service the injectors and replace all the O rings and parts on the injectors.

Thanks in advance.
jayjaya29
Posts: 188
Joined: Jul 30, 2014 12:53 AM
Location: Atlanta, GA

Re: IN tank fuel pump upgrade questions

Post by jayjaya29 »

EE TWO EIGHT wrote: Oct 02, 2022 11:11 PM Do I just go directly from the hose from the new in tank pump to the inlet of the new fuel filter, and out of the fuel filter as normal to the line which runs to the FPR?
Typically, it goes in this order. In tank pump>fuel filter>fuel rail>FPR>tank return

So yes, the in tank pump goes directly to the fuel filter then to the engine.
1st 5er
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Re: IN tank fuel pump upgrade questions

Post by 1st 5er »

Yes.
jc72
Posts: 710
Joined: Aug 16, 2010 11:52 AM
Location: Oakland, CA

Re: IN tank fuel pump upgrade questions

Post by jc72 »

It’s discussed very thoroughly in this thread: viewtopic.php?f=3&t=101410&hilit=Walbor ... 1b21bf4d80
EE TWO EIGHT
Posts: 267
Joined: Aug 10, 2010 5:20 PM
Location: The outback of the southwest

Re: IN tank fuel pump upgrade questions

Post by EE TWO EIGHT »

Thanks guys.
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