Fuel filter is good for a quarter million miles or more. I wouldn't bother replacing unless you have actual problem that is fuel pressure related after pump is replaced.


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Hi all,
The last part arrived today, O ring, put it all together and works fine. Glad I bought the OEM pump instead of after market, should be the last pump needed for this car.
Thanks for all your support!

Did you get the Pierburg fuel pump ONLY or the whole assembly?
I think the pump alone is good enough. But it should be Pierburg, which is only $150. The whole assembly costs more.

Re fuel filter, I replace every 100K miles.

I bought the Pierburg pump only, and replaced the filter.

Now that I replaced the pump, and siphon pump O ring (with the "improved O ring") and teflon tape, my car ran out of gas at 1/4 tank. What's with that? I thought what I did with the siphon pump would prevent that.

You have to determine if the l problem is actually siphon related. Use test six to read how much fuel is left and right. If there is fuel right you might have a quick fail Electric pump or you could have a major leak l elsewhere like a hose came off


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What's test 6? It ran out of gas at about the right amount of miles per tank, so I think one of the floats may be stuck. I read something about bending one of the float arms a bit so it doesn't hit the side of the tank. Does this make sense? I was careful removing and replacing items in the tank, trying not to bend the float arms.

Search for BMW hidden menu to learn how to use the system. By reading the values live you can determine if a float is stuck etc.

Test 6 Video...


https://www.youtube.com/watch?v=cO_tBe58ew8

In your original post, did the car die when the tank was at 1/4?