Tandem Fuel Pump Inlet Restriction
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Remove the short rubber hose at the fuel inlet line (left side of engine close to the frame rail). The larger of the two fuel lines is the fuel inlet. The smaller line is fuel return. Install Rotunda Low Fuel Pressure Adapter (014-00931-2) to the fuel inlet line and connect to a fuel restriction gauge (0-30 in. Hg vacuum). Measure restriction at WOT (maximum engine speed out of gear with the brakes set and the wheels blocked). If restriction measures more than 6 in. Hg., there is a blockage between the engine and the tank.