4 PRIMING THE SYSTEM
The pumps supplied with Simplex Pump Set are not self-
priming. If a pump is allowed to run without fuel, pump
damage will occur. Pump Sets are shipped from the factory
filled with #30 oil to facilitate system priming. On
systems that contain a hand pump the hand pump may
be utilized to lift the fuel into the pump set cabinet.
This will not eliminate the need to prime the system at
the pump.
The Pump Set may be primed by installing a priming
tee on the inlet side of the pump. An alternative is to
disconnect the inlet line at the pump and fill the line
with fuel. If the system contains a fuel strainer the
strainer must be disassembled, filled with fuel, and
reassembled.
1. Ensure the Pump is filled with #30 priming oil.
2. Ensure that all ball valves are in the open position.
3. Use hand pump to lift fuel to fuel manifold level.
4. Open the pump inlet line or priming tee, fi ll the line with fuel,
close the line (it is recommended that a foot valve be installed at the
main fuel tank to hold the fuel column.)
5. If the system contains a fuel strainer, fi ll the strainer with fuel.
6. Energize the pump and observe fuel fl ow. If it is a duplex
system, operate both pumps simultaneously.
If the system contains a vacuum gauge on the input side of the
pump, the gauge should read 15" vacuum maximum under normal
conditions (15" vacuum = 20' vertical lift). Vacuum gauge readings
greater than 15" vacuum indicate excessive vertical lift demands or
line restrictions.
If the system contains a pressure gauge on the output side of the
pump the gauge should read 5 PSI minimum pressure 65psi
maximum pressure under normal conditions (.433psi = 1' vertical
head pressure). Pressure gauge readings greater than 65 PSI
pressure indicate excessive line restrictions and/or friction. Pump
Set flow switches have a 5 PSI minimum set point and system
pressure lower than 5 PSI will initiate a loss of fl ow failure.
Pressure relief valves have a 65 PSI set point. System pressure
greater than 65 PSI will cause the pressure relief valve to open and
vent fuel back to the main storage tank.
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