REV03016704010220
16
Priming the System
The pump supplied with the system is NOT automatically self-priming and must not be run dry.
!WARNING! If the pump is allowed to run without fuel, pump damage can occur.
Priming Procedure
The head of the pump on the system is shipped from the factory filled with No. 2 Diesel Fuel Oil in it to facilitate initial
lubrication. This will not eliminate the necessity to prime completely the system. An externally installed priming tee (not
provided) should be utilized to prime the system. Additionally, the lid of the primary filter can be removed, and the filter
housing and suction plumbing can be filled through that method, as well. The primary filter along with the suction line(s)
must be completely filled with fuel (no trapped air) prior to initial system start-up.
The system is equipped with a vacuum gauge on the input side of the pump. The gauge should read no more than 15” HG
vacuum maximum under normal conditions. Vacuum gauge readings reaching 16” HG indicate excessive debris in the
primary filter/water separator. Also, it could be derived from above average flow restriction or too high suction height. This
will likely result in pump shutdown and activate the high vacuum alarm.
Note: 16” HG vacuum = clogged primary filter or suction line flow restriction/excessive lift.
The system’s pressure gauge should show 22 PSI maximum pressure under normal conditions (.433 PSI = 1’ vertical
head pressure). Pressure gauge readings in excess of 22 PSI pressure indicate the need for filter replacement, or fuel line
restrictions and/or friction.
System pressure over 22 PSI indicates a high-pressure alarm and will automatically shut down the pump.
The pump pressure relief valve has a 48-50 PSI set point. System pressure in excess of 48-50 PSI will cause the
pressure relief valve to open and vent fuel back to the fuel transfer pump inlet side.
Summary of Contents for STS 6004
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