MK-I MK-II MK-III MK-IV GULF MIRAGE J-CAR LOLA
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Why not start with your first post today and become an active part of GT40s.com now! And, if you find you enjoy GT40s.com think about becoming a Forum Supporter. | | GT40 Tech - Fueling and Electrics Petrol and Electrons. | 
03-19-07, 04:47 AM
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 #1 (permalink)
| | simonjrwinter serial GT40 owner
Join Date: Jan 2002 Location: Essex, UK GT40: GTD
Posts: 1,768
Rep Power: 24  | Welding fuel tanks
Now I'm not capable enough to do this myself, but the inlet for my fuel tanks come straight out the front of the tanks for about 3-4 inches then stop. I'd rather they turned upwards. I'm thinking of getting an aluminium fabricator to weld some tube so they point upwards.
Now I know how dangerous this can be, but how about if the tanks were turned on end and filled right up to the neck with water? The only petrol fumes would be in the 2-3 inches of pipe sticking out. Would this be safe to weld?
Like I say, not something I will be tackling, just interested to find out.
Simon
__________________
GTD with Southern GT rear end. Lowered engine and gearbox. 302, R21T gearbox with LSD. | 
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03-19-07, 05:02 AM
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#2 (permalink)
| | Russ Noble Lifetime Premier Supporter
Join Date: Jul 2004 Location: Christchurch,NZ GT40: Building scratc
Posts: 1,341
Rep Power: 20 | Re: Welding fuel tanks
Simon, water helps, but a better way is to purge the tanks with exhaust gases. Hook a hose up from the tailpipe of a car into the tank/s and run it at moderate speed until the tanks are almost too hot to touch. This will completely purge all the fumes out of the tank and also evaporate any small residues of fuel trapped in seams etc. This method is the best I have used. No problems.
Cheers
__________________ Russ
° Scratchbuild. Spaceframe Mk1 wide body. Dry sumped, forged, 351W. LSD930. 10's & 14's.
Most parts now sourced. Body 80% done. Chassis, rollcage 95% finished. Suspension 70% built. Engine starting to build, and trans in a million pieces.  http://www.gt40s.com/forum/gt40-buil...atchbuilt.html | |
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03-19-07, 05:09 AM
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#3 (permalink)
| | wealdenengineer 10 tenths
Join Date: Oct 2001 Location: East Sussex, UK
Posts: 1,041
Rep Power: 17 | Re: Welding fuel tanks
Russ, thats the way we do it too, Frank | 
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03-19-07, 03:29 PM
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#4 (permalink)
| | Scott Calabro Supporting Vendor
Join Date: Oct 2006 Location: New England GT40: TS40 # 875
Posts: 725
Rep Power: 9 | Re: Welding fuel tanks
Brilliant !!!!
And to think I wasted a whole bottle of Dry Nitrogen last time 
Brilliant !!!!
Best,
S | |
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03-19-07, 06:25 PM
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#5 (permalink)
| | Malcolm Gold Supporter
Join Date: Jun 2003 Location: Surrey, UK GT40: GTD
Posts: 1,502
| Re: Welding fuel tanks
If you are to muck about with your fuel tank, consider runing a better air breather line from the rear of the tank to the filler cap instead of the one from the front of the tank. It will help you when you fill her up with petrol.
__________________
Malcolm
GTD40, Prosport 3000 Spyder, Lotus 51c, Mazda MAX5 MX5 (Spec Miata) and Porsche 996 C4S | |
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03-19-07, 06:34 PM
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#6 (permalink)
| | simonjrwinter serial GT40 owner
Join Date: Jan 2002 Location: Essex, UK GT40: GTD
Posts: 1,768
Rep Power: 24 | Re: Welding fuel tanks
Thanks Malcom. The car originally had a fuel and return connection in the rear of the tank so I suppose I could now use the redundant return fitting.
Simon
__________________
GTD with Southern GT rear end. Lowered engine and gearbox. 302, R21T gearbox with LSD. | |
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03-21-07, 11:31 PM
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#7 (permalink)
| | Phil 3 Tenths
Join Date: Feb 2004 Location: New Jersey GT40: scratch built Mk1
Posts: 342
Rep Power: 8 | Re: Welding fuel tanks
Simon
I am assuming that whoever welds your tanks will be using TIG process with argon, or argon/helium mix. Its easy to just purge with argon and leave the highest point open...or if you need to manuever the tank around to weld it properly leave a small bleed hole and weld away. I do a lot of tanks this way and never have a problem. Just let if purge for a few minutes to make sure you have a complete inert atmosphere.
Cheers
Phil | |
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