2005 X5 4.4 fuel pump question

[andrewwynn]

I bought the assembly but the float doesn't match the original oe (reads different value at the baseline) I recommend getting a pierburg pump only when replacing the Electric pump as long as your gauge is working properly. Much better quality.

You already did just that so as you suggested you might have a caught up float. You need to pull up test six and determine what's going on. The right side float is not likely to show more than a few liters even if it gets caught so most likely the left side would be the culprit.

You can pour in a few gallons to get car running if the gauge just reads wrong.

[jsoto]

I'll have to read this thread in whole. When I looked at the raw #'s on proactive maintenance, I just did the whole assembly. It wasn't that much more on the grand scheme....if my memory recalls.

[andrewwynn]

OE assembly is $350-400 vs pump only $150. I bought a knock off $120 whole assembly.

[jsoto]

HEH, AW. I know roughly the#'s. Between fatigued plastic, and TIME, the cost differential was the the ~same~ to me.

[Overboost]

At 163,000 miles I know my FP should be worn at best and should be making its way onto my list of things to do. I did the PM replacement on my E46 with a Siemens/VDO assembly but it was only $115. What is the consensus here for PM on the X5? Pierburg pump only or complete assembly? (aftermarket or OEM)

[jsoto]

For twice the price of the pump, I'd go for the assembly IMO. No messing with a fuel drenched apparatus on whatever work surface. 12+ year old plastic vs. new plastic. It really is a no brainer for me

On the flipside, that extra cost can also be applied to the maintenance rainy day funds stash as well

[80stech]

I went with Bosch/Pierburg pump only. I don't have the degraded plastic problem like some others seem to. I did spend a bit of time trying to figure out if the arrow should go up or down on the rubber mounts go though!

[pghguy517]

Originally Posted by cn90

Test 6 Video...


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

Thank you! I had no idea this was something available on dashboard. Was thinking it was something in OBDII reader.

My gauge reads almost full, about 50 miles since fill up, and the test 6 readings are 54.3/25.4/79.7L I'm assuming the 79.7 is the total of the fist 2 numbers. What am I looking for in these numbers?

[cn90]

The numbers above are L (driver side), R, and sum (total).

You cannot test the functionality of the siphon pump until the L side is about 30L.

So drive until you are down to just above 1/4 tank, then drive around with Test 6 on and take note:
- If L side is 30L and R side is 0 and car stalls, then the siphon pump does not function as designed (check the O-ring, Teflon installation etc.)

Take your time to read the thread below for detail:

https://xoutpost.com/bmw-sav-forums/...flon-wrap.html

[andrewwynn]

Driver side is RIGHT In UK and other place. Best to stick left/right not driver/passenger on International forum.


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