Using body filler.

[CookMySock]

In the end there is no point in pulling the dent out, except to give you some more space for fuel, unless you are worried about the lump of bog falling out. The problem with polyester bog, is it shrinks when it cures. Epoxy is a lot better in this respect.

What we really need, is a large dildo-like thing, with a fat knob on the end that nods back and forth with some force, kinda a cross between a ladies toy and an air hammer. Poke it into the tank and nudge it against the dent and let it belt away at it for a while until the dent cums out, so to speak.

Steve

[hayd3n]

i also have a dent or 2 to remove ,one ive hit a few times with a rubber mellet as it is a inny/outie dent not much improvement yet:<
gotaa get rid of the outie one them ill just sand/newtech it

[motorbyclist]

Vapour lock. A "bubble" of petrolly air trapped inside in a crevice of the tank. Just think how hard it is to get all the air bubbles out of a hydraulic systenm when you bleed it. And a tank has lots more blind spots and dead ends than a brake system.

but how does that affect an open tank?!

idea behind water is not only denial of oxygen to the little fuel bubbles at the bottom, but it carries heat quite well too - fuel has a hard time igniting when it can't exceed 100 degrees. leave it open at the top (and brimming with water) and there's (surely) not much to go wrong...


either way, using argon from you welding gear is a pretty clever idea


and saves the hassle of getting all the water out too