My fuel tank seems to be a "bit" off and accepts only ~105-110ml of fuel
(including fuel lines).
The legal is 125ml, how can i increase the capacity of the tank without using feets of fuel line?!!!!
I already have a fuel filter and don't want to use another one.
I will if i have to eventually but how much volume does those large Kyosho fuel filters have?

new tank! more fuel line! run 2 fuel filters in the line that goes from the tank to the carb

i agree on the new tank, but he already stated that he didn't wanna run more fuel line or 2 fuel filters if he didn't have to. I say just get an 8ight fuel tank, it's the perfect size and it could be adjusted to run more fuel for club races.

well theres only so much that can be done to increase capacity and he doesnt want to do most of them so new fuel tank is really the only other option

but you gotta remember, the ROAR rules state that there can only be so much fuel line and running 2 fuel filters is illegal also, so i'd say the ONLY option would be to upgrade to a legal 125ml tank

If he wants to run 7 filter he can, even roar events, just as long as hes not over the 125cc mark. Page 60 rule book, rc pro series is the same way. Tanks that are listed at 125cc are only 118cc at best, add in the fuel line and filter youll end up at the 125cc mark, mines tecked at 124cc.

I'll try to see what fuel filters i have and see what i can do.
In Europe there is also a limit to how long fuel line you have.
If i'm not mistaken is around 30cm(12inch)

Compressed Air and a Heat gun. Not sure how far you would be able to
swell one of these tanks but it might be worth a shot.

Can i use a hairdryer and use the back end of a screwdriver to push the tank from the inside in order for it to swell??

yes that would work, you might need something hotter than a hairdryer though

WHAT!!!!!! are u guys Kidding me ? that has to be the Dumbest idea ive even heard....all your askin for is a cracked tank and MORE problems down the road....buy a new tank and be done with it.....that is if u can even Fit another tank on to your mounts.

Just get a helicopter tank and duct tape that thing to the buggy!!!![&:]

haha then get a perminant marker and write 125CC on the side so as to fool any suspicious people?!
'dang that kids driving an hour main on one tank of fuel! [&:]'

increase the fuel line length and add a inline reservoir from a caster or Mugen.
benefits of longer fuel line is more consistent fuel pressure and tune as well allows the buggy to run better when on its lid.
Fuel line length is shortened when you add a reservoir.

If your bugy is more a basher and has a odd size tank it may be a good idea to buy a tank that fits from another brand.

I tried this. It swelled the bottom of the tank too much making it hit the chassis, then after I spaced it off the chassis, it would never seal around the lid again. I guess there is some possibility to making this idea work, but gambling one tank is enough for me.

I thought of that as well.
Heating the tank might cause air leaks from the lid due to deformation.