Plastic Fuel Tank Welding
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  1. #1
    1000+ Posts pgti6's Avatar
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    Default Plastic Fuel Tank Welding

    I need some help in trying to find a competent company who can do plastic welding on a fuel tank.

    This is for my track car & I want to reduce the tank capacity from the std 70 litres to about 40 litres. Easiest way would be to cut each side off & weld in new endplates.

    I'm sure there was a reference to it sometime before we lost our recent history but a search didn't turn up anything.

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  2. #2
    Fellow Frogger! dieselman's Avatar
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    BobD is the expert on getting plastic fuel tank repairs.

  3. #3
    Fellow Frogger!
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    I would think about this a bit. What are you trying to achieve? If it is weight loss, most of the weight is in the fuel, not the plastic. Agreed, if you just run the tank half full, you may suffer from fuel surge, but you could address this by putting foam in the tank, or building a surge tank.

    I would give serious consideration to fitting a bag in the tank. I was hit from behind on a race track, which split the tank, which did NOT have a bag in it, resulting in a big fuel spill, and a fireball that was higher than the grandstand. The only reason I am sitting here is blind luck.

    Tim

  4. #4
    1000+ Posts PeterT's Avatar
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    I've used Robbo's Plastic Surgery, St Marys, 02 9673 4413, several times for 205 tanks. The 205 is a bit different in that it's more difficult to fit a surge tank in a seperate compartment, like the boot in a 405. I'd probably fit a small cell and surge tank in the boot if I was running a 405.

    '92 205 Mi16
    '90 Mi16x4

  5. #5
    1000+ Posts pgti6's Avatar
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    Tim the objective was to prevent surge & save weight with a smaller tank. I checked your suggestion of filling the tank with foam and the only downside seems to be that it needs replacing every couple of years as the additives in the fuel begin to break it down & cause blockage issues. What are these internal bags you mention? Can they be fitted to the existing tank or only a boot mounted type?

    Wouldn't the standard position, ie: in front of the rear axle be preferrable to being boot mounted-lower C of G & less chance of it bursting?

    I'll give Robbo's a call & find out what they recommend-bag, foam, baffle/s.

    Thanks
    405 Mi16 2.2 litre race car for sale.
    http://www.aussiefrogs.com/forum/car...-car-sale.html
    https://www.my105.com/ListingDetails...d/518/id/22164


    Lap times- Sandown 1 27.9
    Phillip Island 1 53.8

    Previous Frenchies-
    1988 205 Gti
    1998 306 GTi6
    1997 306 N5 sedan
    1996 306 N3 XT hatch
    1976 Renault R16TS manual in Avocado
    1976 Renault R16TS manual in Trak Yellow
    1975 Renault 5 Guernsey, Channel Islands
    1972 Renault 4 Guernsey, Channel Islands

  6. #6
    Fellow Frogger!
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    I was thinking 205, sort of naturally enough, and didn't pick up that this is a 405, with a sealable boot. Armed with this information, I agree 100% with Peter. A fuel cell will have a bag in it already. If C of G is a real consideration, you could hang it underneath - remember the "drop tanks" on all those Toranas?

    I honestly don't know about fitting a bag in the existing tank. It is obviously possible, but whether it is practicable I can't say. You would have to talk to the manufacturers. A ready made fuel cell certainly simplifies matters. I just wish I had had one!

    Motor sport, done properly, is amazingly expensive, isn't it?

    Tim

  7. #7
    1000+ Posts pgti6's Avatar
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    Having a boot does make a fuel cell more practical although I was also trying to keep costs down hence the idea of cutting down the original tank.

    As for the cost of it. Worse than having an expensive habit/woman/kids.
    405 Mi16 2.2 litre race car for sale.
    http://www.aussiefrogs.com/forum/car...-car-sale.html
    https://www.my105.com/ListingDetails...d/518/id/22164


    Lap times- Sandown 1 27.9
    Phillip Island 1 53.8

    Previous Frenchies-
    1988 205 Gti
    1998 306 GTi6
    1997 306 N5 sedan
    1996 306 N3 XT hatch
    1976 Renault R16TS manual in Avocado
    1976 Renault R16TS manual in Trak Yellow
    1975 Renault 5 Guernsey, Channel Islands
    1972 Renault 4 Guernsey, Channel Islands

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