Gas tank questions

[flyingfrizzle]

The only way to test in place is to pressure test it with about 3-5 psi of air pressure. If it hold pressure over night you may be good for now but still on borrowed time. Better off to just replace it. It could be pitted badly and still hold air but if you have one little pin hole the air will work its way out overnight. You don't want to have to come back a few years latter from now so best to change it out while in there. Even if it hold pressure it may be full of varnish. I have cut open good looking clean tanks to find a brown/yellow coating on the inside. You can run dual filters / water separators but better off to install a new clean un-corroded tank that you know is varnish free.