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New fuel leak #576624
15/05/19 08:30 AM
15/05/19 08:30 AM
Joined: Mar 2014
Posts: 896
Leicestershire, UK
Bunny Offline OP
Talk Morgan Regular
Bunny  Offline OP
Talk Morgan Regular

Joined: Mar 2014
Posts: 896
Leicestershire, UK
Yesterday, after filling up with fuel, there was a noticable whiff of petrol while driving along. There followed a forensic inspection of all the usual places leaks may occur: hoses around injectors; hoses behind engine; hoses on fuel tank link pipe; fuel tank brackets; etc. In the end, I noticed signs of fuel weeping from where the filler pipe meets the left hand fuel tank. It appears that the weld has cracked where it meets the tank.



In retrospect, this is not too surprising because we know that the tanks move up and down and we also know that aluminium is fairly brittle and doesn't flex too well.

My plan is to seal the area with fuel compatible PU sealant but I couldn't help wondering if a flexible section of pipe in the region shown might have prevented the problem in the first place.

My car has covered just over 10,000 miles. It's possible that the crack may have been there for some time and I've only just noticed it. I did give the car a particularly generous fuel fill on this occasion!


Last edited by Bunny; 15/05/19 08:35 AM.

Andy
Re: New fuel leak [Re: Bunny] #576637
15/05/19 10:46 AM
15/05/19 10:46 AM
Joined: Apr 2015
Posts: 325
Lancaster
Phil Bleazey Offline
Learner Plates Off!
Phil Bleazey  Offline
Learner Plates Off!

Joined: Apr 2015
Posts: 325
Lancaster
Seems to be another case of the convenience of " just weld it all together" being overpowered by the reality of needing less stress on the welds. Yes, your flexible connection near the tank will do the trick - good luck.
Phil


2013 M3W www.bleazey.co.uk - Builder of upgrade kits for the Centa coupling and BB mounts for M3W
Re: New fuel leak [Re: Bunny] #576641
15/05/19 11:12 AM
15/05/19 11:12 AM
Joined: Oct 2016
Posts: 95
Nr Haverhill UK
P
PaulR Offline
Just Getting Started
PaulR  Offline
Just Getting Started
P

Joined: Oct 2016
Posts: 95
Nr Haverhill UK
Hi
Looks like bad weld penetration at that start and stop point,
maybe grounds for a no charge replacement


PaulR

2016 M3W
Re: New fuel leak [Re: PaulR] #576644
15/05/19 11:30 AM
15/05/19 11:30 AM
Joined: Feb 2019
Posts: 1,383
West of Seattle, USA
LightSpeed Offline
Has a lot to Say!
LightSpeed  Offline
Has a lot to Say!

Joined: Feb 2019
Posts: 1,383
West of Seattle, USA
Originally Posted By PaulR
Hi
Looks like bad weld penetration at that start and stop point,
maybe grounds for a no charge replacement


+1 for the very poor weld. I too think it should be replaced for free.

Your idea of adding a flexible section seems reasonable, but why not just replace the entire metal tube with a flex tube?


Stephen
2019 M3W

Re: New fuel leak [Re: Bunny] #576653
15/05/19 12:25 PM
15/05/19 12:25 PM
Joined: Jan 2014
Posts: 952
O'Fallon, Missouri USA
D
Dan_Lockwood Offline
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Dan_Lockwood  Offline
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D

Joined: Jan 2014
Posts: 952
O'Fallon, Missouri USA
Just a word to the wise, it takes a special rubber tube for petrol/gas. Using radiator type hose will not last long for petrol.

So just make sure you purchase the correct hose and you should be good to go.

Re: New fuel leak [Re: Bunny] #576654
15/05/19 12:29 PM
15/05/19 12:29 PM
Joined: Feb 2019
Posts: 1,383
West of Seattle, USA
LightSpeed Offline
Has a lot to Say!
LightSpeed  Offline
Has a lot to Say!

Joined: Feb 2019
Posts: 1,383
West of Seattle, USA
MiniCooper has twin tanks and a long path from the cap to the tank. Worth checking out.


Stephen
2019 M3W

Re: New fuel leak [Re: Bunny] #576688
15/05/19 04:53 PM
15/05/19 04:53 PM
Joined: Mar 2014
Posts: 896
Leicestershire, UK
Bunny Offline OP
Talk Morgan Regular
Bunny  Offline OP
Talk Morgan Regular

Joined: Mar 2014
Posts: 896
Leicestershire, UK
Thanks for everyone's thoughts on this. If the car was under warranty then the tank may have been replaced f.o.c., however at seven years old (and with the benefit of past experience) I don't even think it's worth asking! What worries me is that, as far as we know, they are still fitting the same design of fuel tanks to new cars, design faults & all.

Oh, and remember to double check the tension of your fuel tank webbing straps folks! If you can move the rear of the tanks up and down by hand the straps are too loose. soapbox

Last edited by Bunny; 15/05/19 04:58 PM.

Andy
Re: New fuel leak [Re: Bunny] #576690
15/05/19 05:03 PM
15/05/19 05:03 PM
Joined: Feb 2019
Posts: 763
New River Valley, VA
rcmatt Offline
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rcmatt  Offline
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Joined: Feb 2019
Posts: 763
New River Valley, VA
It sure looks like a poor weld. But I agree with everyone. A short pipe and then flex hose would have been better.... of course then I remember I have occasionally filled to the tip top of the piping pantsdown


Rodger
2018 M3W "Dreamers on the Rise"
2004 Plus 8 (wife's)
old Goldwings and a couple of Harleys

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