Quote:
Originally Posted by andrewwynn
200/6=33.333 mph average. If you drive a lot of highway miles it will not be hard to achieve 250-300,000 miles.
On an X5 the "more than 1/4 tank" has no bearing whatsoever on fuel pump wear and actually greatly increases your chance of getting stranded due to the more likely failure of the siphon jet.
The X5 fuel tank sump holds about 5.0L of fuel that's it. Any more spills over to the left side of the tank once you are below about 27L ( well above 1/4).
On other cars even BMW models that have a design to encourage gas to stay near the pump do not have the actual sump like x5 tanks just a skirt around the pump to keep gas from sloshing to the sides during turns.
Pumps no matter how well treated have brushes that slowly wear out and will last 5-6000 hours on average. (with e-10 gas; 4-5000 hours with e-0 unpolluted gas).
I'm not against picking up a replacement pump in the 150-180,000 mile range but it's one of the easiest repairs to perform I would wait for failure or at least until you get over 5000 hours estimated on the pump before replacing.
Unless wife actually ran the pump dry, the whole 1/4 tank thing is a myth from the 50s and 60s.
250/5=50 250/6=41.667. if wife's average speed is between 41 and 50, 250k miles is the expected life of a fuel pump.
At 400k, 400/6=66.667 means almost exclusively highway miles: a pump that age is going to be almost out of brushes and bordering on miraculous. (unless you run e85); apparently more ethanol adds lifespan.
You don't live in an alternate reality where you can treat a pump nicer and get the brushes to not wear. The pump is running 100% of the time that the engine is on it doesn't matter the speed etc.
That said just like the E10 will improve lifespan, you might be using gas with another additive that will add even more lifespan but it will not double the life. I'm sure there are outlier that will last 8000 or even 9000 hours as a fluke that's why I don't recommend preemptive replacement
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On the low fuel part your thinking of the oh its got an 1/8th left or so.
Im talking nothing showing on the gauge most of the time. Even with the sump its going to run dry at times. Ive had to push the thing to the pump for her before because she ran it OUT of gas at the GAS station.
I cannot fathom why she thinks it takes more effort to keep it full and never let it get under a 1/4 vs praying you get to the gas station and having to schedule what time she leaves for work so she can get gas.
As for the 323i, yep it will run out of brushes eventually but since its more or less a toy now and isnt used anymore Im more interested in seeing how far it will go now
Need to sell it but its more trouble than its worth to try to sell it around here. Paints fading but otherwise its mint.