ROFL, yeah, I know.. water freezing in there seems unlikely since the boat is from the LA area. But what the hell, it might have seen freezing temps in the last 15 years. I don't remember any, but maybe it did. Thermal shock? Hmm.. maybe. 

Lol, Hi everyone. Just joined the forum cuz I just bought an old jet boat, woohoo! I'm not particularly new to boating, but I've never had a jet before, and never had a boat quite this old either, its a 1974 Sleekcraft mini daycruiser. I hasn't run in quite some time as far as I can tell and I think I'm ok with prepping the olds 455 before attempting to fire it up, but I'm a little concerned about the fuel tank. A buddy of mine has an older jet and I guess the fuel tank is molded fiberglass??? It was leaking, flooded his bilge with gas and cooked his engine compartment when it went off.

Are fiberglass tanks common? I've had stainless, galvanized and plastic, but never heard of fiberglass tanks before. If it does have a glass tank, how can I tell, and is there a way to test it for leaks before I assume everything is hunky dory and take it out for a spin?

Been there, done that with old rotton steel tanks before. Great site by the way, I've learned a lot already in the short time I've been looking around here.

Regards,
Cal