which fuel pump to change

[1iwilly]

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

[g300d]

Transfer pump.

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

[1iwilly]

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

[cn90]

Your siphon pump (aka transfer pump) fails.

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

[Qsilver7]

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

(and the silver fuel filter/pressure regulator can be seen in the pic below...which is also located on the exterior left (driver's side LHD) of the tank)

[1iwilly]

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

[cn90]

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

[1iwilly]

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

[g300d]

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.

[1iwilly]

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