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Old 07-23-2009, 02:29 PM   #1
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Default Expanding the fuel tank

Hi Guys,

Thought i would ask the question on here as i have been told they used to do this alot.
My questions is how do you blow out your tank to get more volume.
I was told years ago how to do it but i wasnt sure.

Does anyone know how this can be done, as my tank is under volume like to get that bit extra out of it

Thanks
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Old 07-23-2009, 02:40 PM   #2
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If you did heat it up and expand it the wouldnt that hurt the seams on the fuel tank? Maybe more fuel line would be a better solution
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Old 07-23-2009, 02:59 PM   #3
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Default expanding fuel tank

Quote:
Originally Posted by carlin View Post
Hi Guys,

Thought i would ask the question on here as i have been told they used to do this alot.
My questions is how do you blow out your tank to get more volume.
I was told years ago how to do it but i wasnt sure.

Does anyone know how this can be done, as my tank is under volume like to get that bit extra out of it

Thanks
What kind of chassis are you talking about. If you heat the seam, it will most likely leak, just as the other post says.
Many tanks are interchangeable with other manufacturers.
I have changed tanks in my on-road cars with ohter makes for longer run times. Just be sure if you race the car, you do not exceed the max. volume allowed
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Old 07-23-2009, 03:13 PM   #4
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Just heat up the tank with a paint removal gun and blow on the tank or use some tools to bend it outwards from the inside.

Just find the spots where you have some room to shape the tank more outwards.
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Old 07-23-2009, 04:24 PM   #5
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Quote:
Originally Posted by Roelof View Post
Just heat up the tank with a paint removal gun and blow on the tank or use some tools to bend it outwards from the inside.

Just find the spots where you have some room to shape the tank more outwards.
What he said, or as also suggested, you can add fuel line and/or an external filter.
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Old 07-23-2009, 04:40 PM   #6
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If you have an air compressor with a fine point nozzle this method works pretty well. Block the fuel outlet with a small piece of fuel tubing. I generally use a 3mm screw screwed into the fuel tubing and then put over output fitting. I then attach a longer length of fuel tubing to the pressure intake fitting of the tank. I turn on the air compressor to about 10 to 15 lbs of air pressure. NO MORE than this. You will see the tank expand slightly. With a heat gun I very gradually heat the area I want to expand. You will see the area soften. Allow to cool..... and your done.
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Old 07-23-2009, 05:23 PM   #7
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Quote:
Originally Posted by RayJ View Post
If you have an air compressor with a fine point nozzle this method works pretty well. Block the fuel outlet with a small piece of fuel tubing. I generally use a 3mm screw screwed into the fuel tubing and then put over output fitting. I then attach a longer length of fuel tubing to the pressure intake fitting of the tank. I turn on the air compressor to about 10 to 15 lbs of air pressure. NO MORE than this. You will see the tank expand slightly. With a heat gun I very gradually heat the area I want to expand. You will see the area soften. Allow to cool..... and your done.
This is exactly how I have done it before but you have to be very careful with the heat. It's very easy to blow a hole in the tank if you get a spot too hot.
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Old 07-23-2009, 11:52 PM   #8
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What is your car, carlin ?

Boil the tank in boiled water and you blow some pressure through a long silicone tube with your mouth. Use zip ties to lock the nipple and silicone tubes. Keep the lid opener on top, above water. Becareful when doing this acrobats.... ---> hot water and your skins.
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Old 07-24-2009, 07:00 AM   #9
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go for extra fuel tube. just wind excess tubing properly with a tube clip. maybe 3/4ft length would do.
seen my cousin doing this experiment with his mtx4 tank and boiling water long time ago. seems ok at the begining, expended tank 80cc which is reasonable. turns out, he made it fragile maybe somewhat brittle. all it need is just a stupid flip and it cracks open.
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Old 07-24-2009, 08:40 AM   #10
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Hi Guys,

Thanks for the reply, thats the method using boiling water.

It's for 1/8th rallycross not onroad.

It's for Kyosho MP9 fuel tank.

Just i know loads of onroad guys do this not many ppl in rallycross do.

Try putting alot of fuel tubing just gets messy & i like having tidy car though.
Also it has plenty of fuel tubing already.

Thanks for the replies though guys.
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Old 07-24-2009, 03:12 PM   #11
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I can say that with the extra fuel tubing, when I've tried it, the engine does not perform the same. Blowing the tank out is the better way to go...JUST TAKE YOUR TIME!
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