cleaning out my fuel tank

The fuel tank for my Mazda has been sitting for a long time.
I pulled this truck from the woods where it had sat for like 6 yrs.
Neadless to say the fuel is bad and has turned to gum.
Anyone got any ideas how to disolve this stuff.

So far 2 gallons of Purple Power, and 2 gallons of Clorox has yet to do the job.

get a POR 15 kit, it comes with 3 different stepes, the first two are cleaning and the last one is the sealer, I used it on a friends truck and it worked great.

might wanna be careful putting chemicals in there....end up with a bomb

ole varnish in the tank aye? try some pain thinner to clean it out, but like lucky13 said after its clean you need to use a sealer of some sort
after you get the varnish out.

took mine to a car wash and pressure washed the shit out of it. haha. that is how we do helicopters too. it works.

Worked for me too...

I removed the tank from the frame, cleaned up the outside (there was some corrosion) and discovered 6 pinholes in the tank, all in the forward section. I guess it's from rocks and debris hitting there first??

I went to the local carwash and spent $5 (3 washes with soap and 2 washes to rinse). The tank looked pretty clean to me so I brought it home and let it air out for a week before I reinstalled.

I thought about buying an internal tank sealing kit but the price in Canada is prohibitive. As for the price charged by garages that "recondition" gas tanks, I can almost buy a new tank for the price.

Anyhow, I went to Canadian Tire and bought some pinhole sealing putty for $4 and I haven't had a leak since.

The weather was finally nice enough yesterday to swap my faulty carb for an eBay special and the truck started on the second try. Now all I have to do is check the idle and she'll be fine.

No shit - finnaly some real nice weather -