motor issues, carbs dirty maybe?

[Bushwacker]

A lot of the 6 gallon tanks were set up for smaller motors (like V-4's) with 5/16 dia. fuel lines. Wouldn't use one of those for a V-6. I think you'd be better off with a jerry jug.

If it acts up again, try pumping the bulb. It's behavior will give you some good clues. If it stays flat after squeezing, there is a restriction up stream, between bulb and fuel supply. If you can't pump it much before it gets hard and motor doesn't pick up speed, there's a restriction between the bulb and carbs. If doesn't get real hard and motor picks up speed, you may have a weak fuel pump or a blockage that pump suction can't overcome but pressure will at least partially overcome. Be careful not to run long in lean condition because lean combustion produces very high temperatures that can either burn a piston, cause it to expand so much that it can score the cylinder or even seize up!