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earth safe
Fuel Systems for Critical Power
Startup
1. Prime the suction line. Remove the threaded plug on the pump inlet piping and place
diesel fuel into the piping until full. Reinstall the threaded plug. Operate the pump for
60 seconds maximum. Observe the inlet and outlet gauges to confirm pump rotation and
progress of eliminating any remaining air from the suction piping. A fully primed suction
pipe will be demonstrated by a steady vacuum gauge reading on the pump inlet.
2. Open all inlet and outlet valves and confirm that there is a clear flow path from the fuel
source to the destination.
3.
Manually start pump to confirm pump prime. Operate the pump for 60 seconds
maximum. Observe the inlet and outlet gauges to confirm pump rotation and progress of
eliminating any remaining air from the suction piping. A fully primed suction pipe will be
demonstrated by a steady vacuum gauge reading on the pump inlet.
4. If the pump still does not deliver, the cause may be one or more of the following:
a. Suction line air leaks
b. Suction line obstructions
c. Suction tube or foot valve in tank is not installed.
d. Suction lift is too great or the suction piping is too small.
e. Anti-siphon or check valve setting in suction line is excessive.
5. Adjust pressure relief valve to required setting. Adjust the pump pressure relief valve to the
maximum design pressure of the system. This is done by removing the cap from the valve
and adjusting the spring bolt. The valve adjustment should result in the pump being able to
operate against closed discharge valves, without overload trip to the motor.
6. Check pressure and vacuum operating ranges. Confirm that the vacuum and pressure
gauge readings are in conformance with the design requirements.
7. Check for leaks and correct any loose flanges or threaded fittings.
8. Check motor starter overload settings. Confirm that the motor starter overload settings
match the full load amps indicated on the pump motor.
9. Clean inlet strainer. Close the inlet valve to isolate the strainer. Remove the threaded plug.
Clean any debris from the strainer screen.
EMERGENCY POWER FUEL SYSTEMS
Model M20
Duplex Fuel Pump
INSTALLATION, OPERATION, AND MAINTENANCE
