Fiberglass as a fuel tank?

[ragulka]

I had this idea about using fiberglass to build a fuel tank for my veggie oil conversion. Do you think this is a good idea? Will fiberglass break more easily than regular plastic?

[truckinwagen]

fiberglass will crack more readily than plastic, but is much stronger than a plastic tank(the plastic one will deform and crush easier)

I would say that if you build a tank out of fiberglass go ahead and make it good and thick, and then treat the inside with some of that tank repair coating, it will give you a safe, sealed, light tank exactly the shape you want.

[ragulka]

Yeah, i was thinking that I should make it thick and cover the inside with something that'll make it real tight. I don't know itf it's possible to add some kind of elastic stuff to the fiberglass? no? I'm kinda worried about drilling all the holes i need to have on the tank for connections...

[truckinwagen]

I would mold the connections in, put a piece of tubing into the mold where you want an outlet, and fiberglass it in, that way it is part of the tank and gives you a good place to clamp your hoses onto.

[VWSmokr]

Once you're totally satisfied with your tank and fittings, you can have it all sealed with aircraft "sloshing" compound. It totally coats the interior and should alleviate any concerns about the effects of fuel on the fiberglass.

Had a steel 26.5-gallon auxiliary tank custom made (for a favorite non-VW) & the fabricator "sloshed" it, just as a precaution against any future leaks. Leak proof for over 30 years so far! (Also eliminates any internal rust on a steel tank)

Outside of your fiberglass tank can be sprayed with truck bedliner coating, further toughening it against the elements.

Sounds like a neat idea for a custom tank. Best wishes.