which fuel pump to change
 

long story short wife gut stuck last night on way home from work gas gauge showing a tad over 1/4 of a tank but was starving for gas as to when key on push in shrader valve i would hear air but no fuel at all put 5 gallons in started right up. my question which fuel pump meaning pushes fuel from one tank to the other.when low.??? thanks
02 x5 3.0

Transfer pump.

But try unplugging it from the driver's side fuel level sending unit and replacing the o-ring first.

Thanks will try that is the oring available at regular auto parts stores.also what about the transfer tube.??

Your siphon pump (aka transfer pump) fails.

The work-around solution is to keep fuel ALWAYS above 1/4.

Ditto g3ood...the syphon jet is on the left side (driver's side LHD):

Ok thanks for the replies where would be a good source to get a new pump besides the stealer

Siphon Pump is PN 16111184427:

RealOEM.com - Online BMW Parts Catalog


About $86 at dealer...

BMW Parts - Chevrolet GMC Cadillac BMW Mercedes Benz Parts and Accessories

thanks for all the replies will look into this tomorrow $86.00 not bad price

I'm not sure on the size of the o-ring but it shouldnt be hard to find.

Pump has no moving parts, it stops pumping if it develops a leak that breaks vacuum, usually at the o-ring where it plugs into the left tank fuel level sender.

I developed the same problem and it turned out that the locking clip of the siphon pump was damaged when I replaced the fuel level sending unit previously. The siphon pump connection would work its way loose and stop pumping.

Fixing the locking tab solved the problem and I didnt have to change the pump.

Others have found the connections fine but have seen the o-rings hardened and brittle.

Worth a try to check first IMHO. Potentially a few cents vs $86. :)

thanks where can i get a better picture to look at i was able to take pump out 1/2 way but could see how to disconnect the hoses thanks