The bottom petcock on the front of the tank is a problem and incorrect for GMC - Chevy has the front petcock on the bottom tank but on a GMC, that makes the petcock completely inaccessible. You'll have to just crack the bottom hose open to drain the tank
The bottom petcock on the front of the tank is a problem and incorrect for GMC - Chevy has the front petcock on the bottom tank but on a GMC, that makes the petcock completely inaccessible. You'll have to just crack the bottom hose open to drain the tank