The auto shut off is to stop you from ruining your charcoal evap canister by over filling and flooding it with gas.
That’s my guess… only because you said 3/4 full + 1-2 gal = full. It’s a 19 gallon tank. Your really at 17-18 gallons when the pump shuts off.
That’s my guess… only because you said 3/4 full + 1-2 gal = full. It’s a 19 gallon tank. Your really at 17-18 gallons when the pump shuts off.