44
Pump Tests
Verifying Relief Pressure
The relief pressure is factory set to 19 to 25 psi (131 - 172 kPa).
There are two methods used to verify the relief pressure setting;
• The pressure reading can be taken from the control unit of an electronic line leak detection system if one is in
operation. Observe the pressure that occurs after the pump turns off - this is the relief pressure.
• Pressure may be observed using a gauge attached at the impact valve or to the pump’s line test port (see
Figure 42. Locating Pump Line Test Port
Checking Relief Pressure at the Pump
Disconnect, lock out, and tag power at the panel before starting to
service the pump.
When servicing unit use non-sparking tools and use caution when removing or installing
equipment to avoid generating a spark.
enerating a spark.
Equipment Required:
• Pressure gauge with appropriate fittings to connect to the 1/4’’ NPT line test port
Procedure:
1.
If a ball valve is installed down line from the pump, close it.
2.
Remove and save the protective plug over the service screw and turn the screw clockwise (see Figure 42). As
the screw approaches its bottom position, you will hear the system depressurizing. Continue turning the screw
until it can go no further. When the screw is all the way down, back off the screw 4 turns to lift the check valve
and let the fuel drain out of the manifold’s hydraulic cavities. Continue to turn the screw all the way
counterclockwise. When the screw is almost up, the check valve will drop down into position.
3.
Remove the line test port plug (see Figure 42) and attach test gauge.
4.
Open the air purge screw 2 - 3 turns counterclockwise (see Figure 42).
Air p
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ervice
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1/4'' NPT line te
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/fig4
8
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WARNING
OFF