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Fuel leak help #663061
19/09/20 02:03 PM
19/09/20 02:03 PM
Joined: Aug 2009
Posts: 472
Rio Del Mar, CA
kankeL Offline OP
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Rio Del Mar, CA
Guys,

I’ve been trying to locate a fuel leak for a month now with no success. My garage would smell like a gas station overnight. Even when the car sits for a week without starting. I do not smell fuel while driving. Here is what I’ve tried so far:

- added UV dye into my gas tanks, inspected everything like 10 times - there are no visible leaks anywhere
- plugged fuel pump inlet/outlet, pressure tested the tanks through the vent hose: gas tanks hold 10 pounds of pressure for 5+ minutes
- changed fuel injectors
- changed all fuel lines
- changed the vent line
- plugged vents and removed the charcoal canister overnight
- sealed the gas tank cap
- sealed the airfilter
- sealed exhaust outlets

Still smells like a gas station overnight. I am at a loss here, please help!


2016 M3W, Army Green Matte/Tan Leather, 15k miles
Re: Fuel leak help [Re: kankeL] #663065
19/09/20 02:16 PM
19/09/20 02:16 PM
Joined: May 2019
Posts: 196
Hampshire, UK
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Hampshire, UK
That’s a toughie. Mind you I had a similar moment but thankfully discovered it was my lawn mower (also kept in the garage) petrol cap that was cracked. I’m not being funny here but given all the checks you have done, I take it that if the car isn’t in the garage then the smell in the garage disappears.


M3W Brooklands (2015)
Moody 41 (2013)
Re: Fuel leak help [Re: kankeL] #663066
19/09/20 02:16 PM
19/09/20 02:16 PM
Joined: Feb 2018
Posts: 441
SW Iowa, U.S.A.
Bitsobrits Offline
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SW Iowa, U.S.A.
Any other vehicles parked nearby?


Steve
2012 M3W



Re: Fuel leak help [Re: kankeL] #663068
19/09/20 02:25 PM
19/09/20 02:25 PM
Joined: Mar 2014
Posts: 1,114
Leicestershire, UK
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Leicestershire, UK
Originally Posted by kankeL
Guys,
I’ve been trying to locate a fuel leak for a month now with no success.
Still smells like a gas station overnight. I am at a loss here, please help!
My leak turned out to be a fractured weld where the filler tube meets the fuel tank - you had to look very carefully to see where the problem was and I could only smell fuel when I'd brimmed the tank. Some PU sealant around the weld sorted it out.

Last edited by Bunny; 19/09/20 02:26 PM.

Andy
Re: Fuel leak help [Re: kankeL] #663072
19/09/20 02:43 PM
19/09/20 02:43 PM
Joined: Aug 2009
Posts: 472
Rio Del Mar, CA
kankeL Offline OP
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Rio Del Mar, CA
No other sources of gas in the garage, I would I assume the pressure test would reveal the crack in the filler neck?


2016 M3W, Army Green Matte/Tan Leather, 15k miles
Re: Fuel leak help [Re: kankeL] #663090
19/09/20 05:02 PM
19/09/20 05:02 PM
Joined: Feb 2019
Posts: 2,609
Port Orchard, WA.
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Posts: 2,609
Port Orchard, WA.
What year M3W is your Alex?


Stephen
2019 M3W leaking oil right off the showroom floor

Re: Fuel leak help [Re: kankeL] #663103
19/09/20 05:42 PM
19/09/20 05:42 PM
Joined: Apr 2019
Posts: 285
Hertfordshire
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Hertfordshire
Fuel filter can corrode under mounting bracket.
But then i guess you would have fuel spraying out when under pressure so probably not that.

Last edited by Obie; 19/09/20 05:47 PM.
Re: Fuel leak help [Re: Obie] #663110
19/09/20 06:18 PM
19/09/20 06:18 PM
Joined: Oct 2012
Posts: 2,442
Furry Boots City
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Furry Boots City
Originally Posted by Obie
Fuel filter can corrode under mounting bracket.
But then i guess you would have fuel spraying out when under pressure so probably not that.

+1 on this, if you haven't already checked the body of the filter you could have a really small pinhole leak under the bracket and the filter will take a while to drop to ambient pressure from running pressure after the pump is shut down. Worth a look and it takes a tiny amount of petrol to stink out a garage.

Re: Fuel leak help [Re: kankeL] #663115
19/09/20 07:14 PM
19/09/20 07:14 PM
Joined: Feb 2018
Posts: 205
Seattle, WA.
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Seattle, WA.
My leak took a full tank to leak visibly; shop had to use a bit of pressure to find it too. I think with the less fuel, the leaked petrol would evaporate before it became visible.

It was the common cracked forward mount issue and would smell most on the back & bottom of the drivers seat (LHD).

Re: Fuel leak help [Re: kankeL] #663148
20/09/20 06:10 AM
20/09/20 06:10 AM
Joined: May 2019
Posts: 196
Hampshire, UK
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Hampshire, UK
How about a leaking fuel injector?


M3W Brooklands (2015)
Moody 41 (2013)
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