Allow motor to reach full speed. 4. Adjust pressure to 6.0 PSI. Turn relief valve to right to increase pressure. Turn relief valve to left to decrease pressure. See Figure 9. 5. Stop heater. Remove pressure gauge. Replace pressure gauge plug in filter end cover. Relief Valve Pressure Gauge Plug Figure 8 - Pressure Gauge Plug Removal Pressure Gauge Figure 9 - Adjusting Pump Pressure 8 OWNER’S MANUAL Bushing, Lower Fuel Line, and Fuel Filter SERVICE PROCEDURES Continued FUEL FILTER 1. Remove side