Refill tank before it's three fourths empty

YWGT3 · 06-17-2015, 11:35 PM

FYI never let the gas level in your vehicle drop below a quarter tank since the gasoline not only serves as fuel but also as a coolant to the electric fuel pump. Insufficient gas within the fuel tank will lead to degenerative performance and premature wear and potential fuel pump failure due to overheating.

WingZeroX5 · 06-18-2015, 12:18 AM

ok

GlobalScientist · 06-18-2015, 05:54 AM

Hmmm. Skeptical about that. Can you show proof or a link?

overcoil · 06-18-2015, 06:25 AM

I had read similar recommendation from some type of tech article/forum - can't remember if it was direct fuel injection specific or BMW specific.

MightyMouseTech · 06-18-2015, 06:48 AM

I also heard if you drive at speeds below three fourths top speed, the lack of pressure on the windshield will cause it to pop out prematurely.

alz0rz · 06-18-2015, 07:36 AM

no

Cloud9blue · 06-18-2015, 08:19 AM

All modern bmw has the fuel pump submerged in a fuel bucket that is suspended in the tank. Unless you are running the tank to the last liter of gas, the pump will always be surrounded and cooled by the gasoline around it in that bucket.

Love it when people posts up "facts" when they have no facts to back it up...

chillindrdude · 06-18-2015, 08:28 AM

i see you are a pessimist.

three-quarters empty....i see it as a quarter full!

USC2000 · 06-18-2015, 08:34 AM

Quote:

Originally Posted by chillindrdude

i see you are a pessimist.

three-quarters empty....i see it as a quarter full!

Which means two more days of driving!

bradleyland · 06-18-2015, 08:40 AM

Delta0311 · 06-18-2015, 08:46 AM

Quote:

Originally Posted by chillindrdude

i see you are a pessimist.

three-quarters empty....i see it as a quarter full!

YWGT3 · 06-18-2015, 10:16 AM

Quote:

Originally Posted by GlobalScientist

Hmmm. Skeptical about that. Can you show proof or a link?

The advice came from an ex-fleet manager whose hobby is collecting and rebuilding BMW 2002tiis. Perhaps his experience stems from older BMW models whereas newer models could be different.

tc535i · 06-18-2015, 10:20 AM

Quote:

Originally Posted by yw

FYI never let the gas level in your vehicle drop below a quarter tank since the gasoline not only serves as fuel but also as a coolant to the electric fuel pump. Insufficient gas within the fuel tank will lead to degenerative performance and premature wear and potential fuel pump failure due to overheating.

these cars have a much better pump design than your average 70's chevy, if there's 1/4 gal left you can be sure it's in the pump basket. I was impressed when I pulled it out, much better engineering than my e36 and e46

birdcatcher · 06-18-2015, 10:44 AM

Quote:

Originally Posted by MightyMouseTech

I also heard if you drive at speeds below three fourths top speed, the lack of pressure on the windshield will cause it to pop out prematurely.

+1

Buratino117 · 06-18-2015, 11:04 AM

Quote:

Originally Posted by Cloud9blue

All modern bmw has the fuel pump submerged in a fuel bucket that is suspended in the tank. Unless you are running the tank to the last liter of gas, the pump will always be surrounded and cooled by the gasoline around it in that bucket.

Love it when people posts up "facts" when they have no facts to back it up...

That is almost a falacy..

swestall · 06-18-2015, 11:18 AM

My rule is not below a 1/4 tank, that's because I don't want to get stuck by not paying full attention. (which I am often guilty of).

Has worked for many years, so far no run outs.

Delta0311 · 06-18-2015, 11:30 AM

Took lunch and refilled my tank. Was a bit less than a quarter empty though.

bradleyland · 06-18-2015, 12:16 PM

Quote:

Originally Posted by swestall

My rule is not below a 1/4 tank, that's because I don't want to get stuck by not paying full attention. (which I am often guilty of).

Heh, can't really fault you, given the range of the E92 M3.

I propose a revision to the OP's advice:

FYI never let the gas level in your vehicle drop below a quarter tank since this mother drinks fuel like it's 1969, and yo' ass will run out at the least opportune moment.

casper83 · 06-18-2015, 01:31 PM

Quote:

Originally Posted by chillindrdude

i see you are a pessimist.

three-quarters empty....i see it as a quarter full!

The engineer in me says it's completely full. 1/4 full of fuel, 3/4 full of air

MightyMouseTech · 06-18-2015, 02:15 PM

Quote:

Originally Posted by casper83

The engineer in me says it's completely full. 1/4 full of fuel, 3/4 full of air

It should be completely fuel, 25% liquid, 75% vapour.

RJVIII · 06-18-2015, 02:30 PM

Quote:

Originally Posted by MightyMouseTech

I also heard if you drive at speeds below three fourths top speed, the lack of pressure on the windshield will cause it to pop out prematurely.

I'm always popping prematurely.

BwoodBMW · 06-18-2015, 02:33 PM

hmmm so you are telling me the game I play where I try to get miles to empty to zero before I fill up is not good?

06-17-2015, 11:35 PM	#1
YWGT3 iDriver 363 Rep 595 Posts Drives: i8, Porsche Taycan T, MB EQE Join Date: Mar 2015 Location: California iTrader: (0)	Refill tank before it's three fourths empty FYI never let the gas level in your vehicle drop below a quarter tank since the gasoline not only serves as fuel but also as a coolant to the electric fuel pump. Insufficient gas within the fuel tank will lead to degenerative performance and premature wear and potential fuel pump failure due to overheating.
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06-18-2015, 12:18 AM	#2
WingZeroX5 Colonel 766 Rep 2,361 Posts Drives: F80 / F30 Join Date: Mar 2010 Location: New Hampshire iTrader: (14)	ok
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06-18-2015, 05:54 AM	#3
GlobalScientist Second Lieutenant 86 Rep 278 Posts Drives: M4 Vert Join Date: Jun 2014 Location: USA iTrader: (0)	Hmmm. Skeptical about that. Can you show proof or a link?
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06-18-2015, 06:25 AM	#4
overcoil Major General 3074 Rep 5,577 Posts Drives: M235i 6spd Join Date: Dec 2013 Location: Mid-Atlantic iTrader: (0)	I had read similar recommendation from some type of tech article/forum - can't remember if it was direct fuel injection specific or BMW specific.
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06-18-2015, 06:48 AM	#5
MightyMouseTech Major General 4338 Rep 6,196 Posts Drives: 13 135i 6MT LeMans Blue MSport Join Date: Feb 2013 Location: Ottawa, Canada iTrader: (0)	I also heard if you drive at speeds below three fourths top speed, the lack of pressure on the windshield will cause it to pop out prematurely.
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06-18-2015, 07:36 AM	#6
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06-18-2015, 08:19 AM	#7
Cloud9blue Brigadier General 711 Rep 3,251 Posts Drives: around the potholes Join Date: Aug 2008 Location: NY/NJ/MA iTrader: (13)	All modern bmw has the fuel pump submerged in a fuel bucket that is suspended in the tank. Unless you are running the tank to the last liter of gas, the pump will always be surrounded and cooled by the gasoline around it in that bucket. Love it when people posts up "facts" when they have no facts to back it up... __________________ 09 BMW E92 335i: Top Mount EFR 7670 / Dinan / AP Racing / Wavetrac / TC Kline [Full Mod List] 07 BMW R1200S: Shine Yellow / Akrapovic / Ohlins 19 Volvo V90 T6: R-Design / Bowers & Wilkins / Polestar Optimization
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06-18-2015, 08:28 AM	#8
chillindrdude Lieutenant Colonel 1161 Rep 1,726 Posts Drives: anything with 4 wheels Join Date: Feb 2015 Location: Virginia iTrader: (1)	i see you are a pessimist. three-quarters empty....i see it as a quarter full! __________________ My Trackable Street Car 2016 BMW M4 GTS
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06-18-2015, 08:40 AM	#10
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06-18-2015, 11:18 AM	#16
swestall Registered 2 Rep 1 Posts Drives: 535iX Join Date: Jun 2015 Location: Connecticut iTrader: (0)	My rule is not below a 1/4 tank, that's because I don't want to get stuck by not paying full attention. (which I am often guilty of). Has worked for many years, so far no run outs.
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06-18-2015, 11:30 AM	#17
Delta0311 Banned 7478 Rep 10,120 Posts Drives: 2011 BMW 335xi E92 2016 228xi Join Date: Apr 2009 Location: NJ iTrader: (1)	Took lunch and refilled my tank. Was a bit less than a quarter empty though.
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06-18-2015, 02:33 PM	#22
BwoodBMW Colonel 1861 Rep 2,536 Posts Drives: EFFEIGHTY Join Date: Apr 2010 Location: LA LA land iTrader: (0)	hmmm so you are telling me the game I play where I try to get miles to empty to zero before I fill up is not good?
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