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MDE-4447A Global Pumping Unit Operation and Service Manual · May 2008 Page 21

General Vacuum and Pressure Information Troubleshooting

5 – Troubleshooting

General Vacuum and Pressure Information

The following components are normally associated with pump pressure:

• Control Valve

• Meter

• Computer or Pulser Drive Linkage

•Hose

• Nozzle

The following components are normally associated with pump vacuum:

•Blades

• Rotor/Stator

• Filter

• Bypass Valve and Seat

• Float (opened)

• Installation piping

• Tank Vent Pipe

• Angle Check Valve or Foot Valve

• Tank burial depth

Vacuum readings can vary with each installation. To calculate pump vacuum, proceed as

follows:

1 An inch of mercury is required to lift gasoline 1-1/2 feet. Divide the total lift by 1-1/2 feet to

obtain vacuum.

2 Allow an inch of mercury for each angle check, foot valve, or vertical check valve.

3 Allow an inch of mercury for each 60 feet of piping.

4 Add the readings obtained in steps 1, 2 and 3 to determine the approximate vacuum reading at

fast flow.

Note: Excessive vacuum indicates a restriction. Low vacuum indicates a leak.

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Gasboy Gilbarco Global Pumping Unit Operation Manual Manual do Utilizador Página 25