2005 X5 4.4 fuel pump question

[andrewwynn]

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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[pghguy517]

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!

[cn90]

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.

[pghguy517]

Originally Posted by cn90

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.

[pghguy517]

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.

[andrewwynn]

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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[pghguy517]

Originally Posted by andrewwynn

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.

[andrewwynn]

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.

[cn90]

Test 6 Video...


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

[cn90]

Originally Posted by pghguy517

Car died today, 163K miles, I think it's the fuel pump but need to verify. I see that most fuel pumps being sold include the sending unit assembly. Should I buy the assembly or just the pump? Makes me think there's a reason why most are sold as an assembly.
Thanks

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