Gasboy Gilbarco Global Pumping Unit Operation Manual Uživatelský manuál stáhnout pdf (Strana 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

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.

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Gasboy Gilbarco Global Pumping Unit Operation Manual Uživatelský manuál Strana 27