It's hard to write this without chuckling about your 753 "resting peacefully on our access road", that's a funny intro to a post. I'd bet you've dropped your fuel tank pick up line. On your fuel tank there's two elbow fittings. One for fuel pick up and one for fuel return. Pull on your fuel supply line to the primer bulb to determine which one is you fuel pick up line at the tank. When you determine which one is the pick up line, remove it from the tank. It will be a elbow fitting installed in a rubber grommet at the tank. I'd bet you'll find there's no line attached to the fitting, or a cracked line fixed to the fitting. Bobcat uses a vinyl tube in the fuel tank to pick up fuel. One end is attached to the grommet fitting on the tank, the other end had a screen fitting with a check ball at the bottom of the tank. Over time, the vinyl tubing gets hard, and with fuel sloshing in the tank, it breaks the tubing where it connects to the grommet fitting. Pull the grommet fitting out of the tank, install a new vinyl pick up tube and check ball screen (from Bobcat), and re-install, using a new rubber grommet. That should fix your problem.