Gasboy Gilbarco Global Pumping Unit Operation Manual - Manual (Page 27)

MDE-4447A Global Pumping Unit Operation and Service Manual · May 2008 Page 23
Use Gauge Readings to Troubleshoot Self-Contained Dispensers Troubleshooting
4 With the nozzle open, a normal vacuum reading is 6-8 inches of mercury for normal suction.
See
Figure 5-1 .
Figure 5-1: Vacuum Reading - Nozzle Open
5 With the nozzle closed, a normal vacuum reading is 0. See Figure 5-2 .
Figure 5-2: Vacuum Reading - Nozzle Closed
Testing Pump Pressure
To test the pressure of the pump, proceed as follows:
1 Remove the pipe plug in the center of the control valve cover. Covers are marked for easy
identification.
2 Install the pressure gauge.
3 Start the pump and open the nozzle to full flow for a true reading.
4 With the nozzle open, a normal pressure reading is 16-18 PSI pressure.
5 With the nozzle closed, a normal pressure reading is 25-28 PSI pressure. See Figure 5-3 on
page 24 .