I'm guessing something's not quite right

[StevL]

You should be able to drain about a quart or a little more into a glass or clear container and let it sit for a few minutes. You will see the water and fuel separate if that is the problem. I would pull the fuel from the actual fuel line to the engine and then a quart from the bottom of the fuel tank. You can then tell if it's the water separator or if the fuel tank is contaminated too. Even if it's only the filter I would drain the tank.

And maybe it's something else...

Good luck!

Steve

 

[Noah Genda]

"Couldn't you just substitute a portable 5g tank just to see if that's the problem?"

That is an excellent idea!  I'll call today and see if we can make it happen.