How about a fuel tank sealer? I've used the POR-15 sealer successfully on a couple of rusted steel tanks. My only concern would be whether it would adhere to a plastic tank.
Originally Posted By: expat
What I might try if the leak is a split:
Remove the tank and clean it inside and out with hot soapy water, let it dry.
Melt the plastic to seal the tank with a hot Iron. Then reinforce the outside of the repair with a flexable adhesive like Goop.
But it would be so much easier to replace. OP says he can't replace it, but I don't understand why. If you can't find a direct replacement I think I could find one close enough to make it work much better than trying to fix a cracked one.
If it were me I would take the tank off the snow blower and find out what type of plastic it's made from. Usually there are markings saying what type of plastic it is. After you know what the tank is made of find a scrap piece of the same type of plastic. Now with a soldering iron you can melt the plastic tank while feeding in the scrap piece of plastic almost like tig welding. I welded my plastic washer fluid tank and it's holding great.
I've seen a product called Seal-All which advertises for fuel tank repairs and will cure in wet/moist/fuel/etc. Haven't used it for such but have used it a general purpose adhesive and can tell you its quite tenacious and cures rock hard.
The only viable repair I've ever seen to a true plastic gas tank is to cut out the crack. Fabricate 2 round metal plates that screw together, and install with PRC 1422 sealant or a cork gasket.
In much the same way as a fuel tank sending unit fits.
Waiting for the follow up post where the OP ask where to buy a plastic tank because his "fix" wasn't actually a fix. You are not fixing a plastic gas tank on OPE with what I would call a satisfactory repair.