Gas leaking from middle stern below drain plug

[thunderbug]

OK, how 'bout this: a piece of, say latex glove, clamped on hose fittings. Put air in tank & latex should expand slightly. If it doesn't hold, I've got a leak. (I don't have a pressure gauge that will measure 3PSI)

[Richie Rich]

I don't think latex will hold up to the fumes if there are any....I bet if you can find a ball pressure gauge with low psi increments that you can somehow mount or screw into a fitting, it will work...especially if its digital.