Turns over, not starting, has full tank

There is a fuel return hose located at the rear of the engine near the right side of the cylinder head. If this hose is leaking, Hard Starting or no start is the result. The fuel transfer pump (fuel lift pump) is located on the left-rear side of the engine cylinder block above the starter motor Fuel System Components. The purpose of the fuel transfer pump is to supply (transfer) a low-pressure fuel source of approximately (25 psi) to the injection pump and fuel filter/water separator from the fuel tank. Here, the low-pressure is raised by the fuel injection pump for operation of the high-pressure fuel injectors. The transfer pump is driven by an eccentric on the engine camshaft that actuates a spring loaded piston within the pump Transfer Pump Operation Check valves within the pump, control direction of fuel flow and prevent fuel bleed-back during engine shut down. If the check valves become unseated during shut down, the fuel will bleed back to the fuel tank and hard starting will result. It may be necessary to prime the lift pump which is very time consuming.