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Priming the System
PRIMING
The pump supplied with the SFM 1080 is NOT automatically self-priming and must not be run dry.
!WARNING! If the pump is allowed to run without fuel, pump damage will occur.
The pump head of the SFM 1080 unit is shipped from the factory filled with #2 Diesel to facilitate initial lubrication. This will
not eliminate the necessity to prime the complete system. The SFM 1080 is primed by using the externally installed priming
tee (not provided) on the suction side of the system. Also, the primary filter, as well as the suction line, has to be completely
filled with fuel prior to the initial system start-up.
Priming Procedure
1.
Ensure the pump is filled with #2 Diesel fuel
2. Ensure that the inlet ball valve is in the open and the outlet ball valve is in the closed position
3.
Open the externally installed priming tee (located at the highest point of the suction plumbing), fill the line with fuel.
4.
Make sure to completely fill suction line to its highest point with fuel (no trapped air), in particular when the suction line
exits the tank top and the SFM 1080 is located below that level
5. Open the outlet ball valve and ensure the inlet ball valve is also in open position
6.
Switch on the pump and observe fuel flow
The system is equipped with a vacuum switch on the input side of the pump. When the pump inlet vacuum reaches 12”
HG, the system will shutdown and activate the high vacuum alarm. This indicates excessive debris in the strainer (or a flow
restriction, or too high suction height and therefore pressure drop in the suction line).
Note: 12” HG vacuum = clogged primary filter or suction line flow restriction / excessive lift.
The system’s pressure gauge on the fine filter should show 15 PSI maximum pressure under normal conditions (.433 PSI =
1’ vertical head pressure). Pressure gauge readings in excess of 15 PSI indicate excessive filter, or fuel line restrictions and/
or friction and will trigger the high-pressure alarm, automatically shutting down the pump.
