Disconnect the fuel supply line quick connect from the inlet to the gear pump.
Install a pressure gauge adapter between the fuel supply line and the inlet to the gear pump.
โข Pressure gauge adapter, Part Number 4918462, for 5/16 inch fittings
โข Pressure gauge adapter, Part Number 4918696, for 3/8 inch fittings
Install a vacuum gauge that has a range of at least 0 to 762 mm-Hg [0 to 30 in-Hg] onto the pressure gauge adapter.
NOTE: The pressure gauge adapter can also be installed at the priming pump outlet. Install the line between the fuel
supply line and the outlet of the suction side fuel filter head quick disconnect fitting.
