Is it possible to modify a plastic gas tank?

I finshed bagging my 03 Envoy and after countless hours of work, almost everything seems to be working great. My only issue is the stock gas tank, which tucks nicely up above the frame, has a stub on it that the filler neck connects to, which gets smashed by the axle when the envoy lays out. I have taken off the long section of metal and additional hose, but the stub out on the tank is too close to even throw a 90 on and reroute. I want to remove that stub and put it on the top of the tank. I'm thinking epoxy... maybe some 3M 40/40 or 40/50 stuff? Suggestions? Worse case I guess I'll get a fuel cell.

I would think an epoxy like Speedgrip would be your best bet. Try it out. Like you said, worst case u need a cell anyways.

can you dent the part of the tank so you don't have to cut it?, or possibly move the tank mounts over a bit and/or forward. I wouldn't trust any kind of plastic welding or glue mods. To dent, drain and clean, hook up a a shop vacuum to the filler neck, seal with duck tape, and wack it with a rubber mallat. Sounds crazy, but it might work.

any other suggestion? I'd rather use the plastic tank than a fuel cell

junkyard? find a factory plastic cell from a different vehicle that is smaller if you reallly want to use plastic...

to patch the old hole, id use 2 pieces of sheetmetal and sandwich the plastic together using some sort of sealant and bolts. for the new hole, check out the accessories for fuel cells in Summit, there is a filler neck kit for plastci cells that you could use.

Well I used some 40/58 adhesive. This stuff is awesome. It seems top have worked. Had it on there for about a week. Everything worked good, just coveer the old hole up with some plastic similar to the factory tank's plastic. Only problem was my brother forgot to hook up the return line when we put it all back together, but I figured that out real quick. ( 3 gallons of fuel on a shop floor es no bueno)Thanks for everyone's input.