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  #1  
Old 09-20-2019, 07:37 AM
9milligohard 9milligohard is offline
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F30 wont start w low gas

I got a message that I was low on gas and on way to gas station car died. It said 29miles to go at the time. Called AAA for some gas but car still will not fire. It just turns and turns.
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  #2  
Old 09-20-2019, 08:30 AM
namelessman namelessman is online now
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With such low amount of fuel, it is possible that the low pressure fuel pump(LPFP)@fuel tank is broken. Do note AAA suggests not going below 3/8th fuel level, as modern LPFP is submerged in gasoline to cool down. Being only 29 miles left is not good for LPFP.

Ask AAA to town to indies/dealers to fix.
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  #3  
Old 09-20-2019, 08:41 AM
9milligohard 9milligohard is offline
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Thank you. I'll look into that. If I pit more gas will it pressurize enough to atleast get it started?
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  #4  
Old 09-20-2019, 09:19 AM
namelessman namelessman is online now
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Is there any fault code/CEL? It depends of LPFP is already burnt or not. 3/8th tank is about 6 gallons, it may be worth a try.
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  #5  
Old 09-20-2019, 10:48 AM
9milligohard 9milligohard is offline
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I didnt run the code on the OBD reader yet but the car says sumn is up witht the fuel system and to drive moderately.
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  #6  
Old 09-20-2019, 02:56 PM
Michael Schott Michael Schott is offline
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Can't say what's wrong but I put 65,000 miles on an N20 and there were plenty of times when I was well below 50 miles to empty with no ill effects.
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  #7  
Old 09-20-2019, 04:27 PM
Autoputzer Autoputzer is online now
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I regularly run my cars down to one to 1.5 gallons left in the tank. All's well at 123k miles (2007 Chevy Cobalt SS), 61k miles (2014 535i), and 15k miles (2018 X3).

I reset my OBC MPG and trip odometer when I fill-up the cars. From this, I can reliably calculate the amount of fuel I've burned since the last fill-up (trip miles/MPG), and therefore how much gas I have left in the tank. You can't trust the fuel gauge or the OBC's "miles to empty."

Last edited by Autoputzer; 09-20-2019 at 04:43 PM.
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  #8  
Old 09-20-2019, 05:30 PM
namelessman namelessman is online now
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This issue is seldom discussed on this sub-forums, but others have experienced this, e.g.

https://www.bimmerfest.com/forums/sh...d.php?t=538526
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  #9  
Old 09-20-2019, 07:54 PM
adhrp adhrp is offline
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Yeah not sure about the 6 gallon thing. I routinely run my car below that and haven't had an issue through 97k miles.
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  #10  
Old 09-20-2019, 11:39 PM
namelessman namelessman is online now
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None of my cars ever sees less than 1/4th tank except rentals.

https://www.consumerreports.org/cro/...stly/index.htm
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  #11  
Old 09-21-2019, 04:21 AM
Michael Schott Michael Schott is offline
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Quote:
Originally Posted by namelessman View Post
None of my cars ever sees less than 1/4th tank except rentals.

https://www.consumerreports.org/cro/...stly/index.htm
My 86 year old mother never lets her tank get low.
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  #12  
Old 09-21-2019, 08:27 AM
namelessman namelessman is online now
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Quote:
Originally Posted by Michael Schott View Post
My 86 year old mother never lets her tank get low.
Very wise, just like AAA.
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  #13  
Old 09-21-2019, 08:31 AM
namelessman namelessman is online now
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Quote:
Originally Posted by adhrp View Post
Yeah not sure about the 6 gallon thing. I routinely run my car below that and haven't had an issue through 97k miles.
The failure mode is that LPFP is not submerged and hence becomes overheated, so if LPFP is not working hard and/or without fuel submerging it for long then it should be OK.
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  #14  
Old 09-21-2019, 03:09 PM
Michael Schott Michael Schott is offline
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Quote:
Originally Posted by namelessman View Post
The failure mode is that LPFP is not submerged and hence becomes overheated, so if LPFP is not working hard and/or without fuel submerging it for long then it should be OK.
How do you explain those of us who have run our tanks low numerous times with no issues? Itís not luck.
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  #15  
Old 09-21-2019, 03:18 PM
pshovest pshovest is offline
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I never fill up until red light is on. 38 yrs of Bimmer ownership, including (6) w/ over 175K, and I've never replaced a LP fuel pump.

Last edited by pshovest; 09-21-2019 at 03:19 PM.
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  #16  
Old 09-21-2019, 03:24 PM
Autoputzer Autoputzer is online now
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Not all low-pressure fuel pumps are in the bottom of the tank.

I had a '92 Sentra SE-R that wouldn't start if it was turned off with less than a 1/4 tank left. It was probably a leak in the tube going from the bottom of the tank to the fuel pump.
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  #17  
Old 09-21-2019, 05:12 PM
Michael Schott Michael Schott is offline
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I've done some research online and I couldn't find a video specific to the F30 but it appears the LPFP is under the rear seat, not in the gas tank.
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  #18  
Old 09-21-2019, 06:36 PM
Autoputzer Autoputzer is online now
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Frau Putzer's two Honda's didn't have an on-board computer. We usually ran them down until the LOW FUEL light came on. They were fine when we sold them, 104k miles and 147k miles.
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  #19  
Old 09-21-2019, 09:00 PM
namelessman namelessman is online now
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Quote:
Originally Posted by Michael Schott View Post
How do you explain those of us who have run our tanks low numerous times with no issues? It's not luck.
The clues are from OP's post#1 that described the sequence of events, the incident was related to low fuel on a F30.

The next thought process is that, in your 65k miles of your lease, in 3 years(almost 22k a year), how many times your running tank low is at sustained high rpm?

Also note the issue is LPFP overheating, so cold temp actually can help to mitigate heating up when fuel is low.

Another clue is that, not common knowledge of those who lease and don't own F30 beyond first 3 years, or don't currently have a F30, that F30 actually has an ELW on LPFP.

Last edited by namelessman; 09-21-2019 at 11:52 PM.
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  #20  
Old 09-21-2019, 11:56 PM
dzlbimmer dzlbimmer is offline
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The LPFP is under the rear seat, in the gas tank.

Last edited by dzlbimmer; 09-21-2019 at 11:57 PM.
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  #21  
Old 09-22-2019, 12:13 AM
Michael Schott Michael Schott is offline
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Quote:
Originally Posted by dzlbimmer View Post
The LPFP is under the rear seat, in the gas tank.
But not in the bottom of the tank.
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  #22  
Old 09-22-2019, 12:17 AM
Michael Schott Michael Schott is offline
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Quote:
Originally Posted by namelessman View Post
The clues are from OP's post#1 that described the sequence of events, the incident was related to low fuel on a F30.

The next thought process is that, in your 65k miles of your lease, in 3 years(almost 22k a year), how many times your running tank low is at sustained high rpm?

Also note the issue is LPFP overheating, so cold temp actually can help to mitigate heating up when fuel is low.

Another clue is that, not common knowledge of those who lease and don't own F30 beyond first 3 years, or don't currently have a F30, that F30 actually has an ELW on LPFP.
Why are you adding a new variable? First of all itís conjecture not fact that the LPFP is the OPís problem.
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  #23  
Old 09-22-2019, 12:21 AM
namelessman namelessman is online now
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Quote:
Originally Posted by Michael Schott View Post
But not in the bottom of the tank.
Check out this video, 3:35-5:45 gives some clues how far down the F-series LPFP assembly reaches into fuel tank.

Also low fuel supposedly is 50 miles, or 2 gallons, which should still have some buffer to cool LPFP.

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  #24  
Old 09-22-2019, 12:21 AM
namelessman namelessman is online now
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Quote:
Originally Posted by Michael Schott View Post
Why are you adding a new variable? First of all itís conjecture not fact that the LPFP is the OPís problem.
Which is the new variable?
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  #25  
Old 09-22-2019, 06:35 AM
khammack khammack is offline
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This thread is very interesting and a perfect example of why everything on the web should be taken with a grain of salt.

Just because something has not happened to you doesn't mean it is not a thing. If you own an I4 and have not had an issue with the timing chain doesn't mean there isn't a problem with some engines, it just means that you haven't had the problem. I don't know it the low fuel level can cause a fuel pump failure or not, but it would seem reasonable based on the fuel cooling the pump discussion. I wouldn't expect everyone who runs their fuel down to almost empty to have the fuel pump to fail, just some of them.
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