Gasboy Gilbarco Global Pumping Unit Operation Manual - Manual (Page 32)

Troubleshooting Resolving Problems on Pumping Units
Page 28 MDE-4447A Global Pumping Unit Operation and Service Manual · May 2008
Problem
The pump runs, but delivery is slow.
Problem
The motor will not run.
Problem
The dispenser does not deliver an accurate amount of product.
*Not recommended.
Cause Action
The fuel supply level is low. Fill the storage tank.
The vent pipe is partially obstructed. Clean the vent pipe.
The strainer screen or filter assembly has a
partial obstruction. Remove obstructions from the screen or filter assembly.
The bypass valve is not seated properly. Check the valve for any obstructions which may cause the valve to
stay open.
The v-belt is loose. Adjust the v-belt.
The voltage is too low. Check the power supply voltage. The dispenser uses a 115 VAC,
60 cycle electrical circuit. Check for many pieces of equipment on
one electrical line.
A blade or blades in the rotary pump will not
move. Check the rotor and blades for damage. Replace the blades and/
or rotor, if necessary.
An automatic nozzle has been installed. Delivery speed will be reduced by 10-25%. If the maximum speed
is desired, replace with a standard nozzle.
The motor is defective. Inspect the motor for loose connections. If no loose connections
are found, the motor is defective. Repair or replace.
There is a slow leak in the suction line or
intake line. Start the pump and open the nozzle. If bursts of air are felt while
holding a finger on the vent tube, the suction line or intake line is
damaged. Repair or replace.
The intake line, foot valve, angle or vertical
check valve is partially obstructed. Connect a vacuum gauge to the 1/4 inch plug on the filter cover.
Turn the pump on and open the nozzle. A reading of 11 to 13
inches of mercury with no flow indicates a partial obstruction in the
suction line. Clean or replace the suction line components.
The control valve is partially obstructed. Check the valve for an obstruction. Replace if necessary.
The nozzle check valve is sticky. Clean or replace the nozzle check valve.
The hose is defective (flattened). Replace the hose.
Cause Action
The power is off. Check the circuit breaker in the station.
The motor is defective. Disconnect the power supply. Inspect the motor for loose
connections. If no loose connections are found, the motor is
defective. Repair or replace.
Cause Action
There is an obstruction in the control
valve. Clean the control valve. It must slide freely in the valve cavity.
There is an obstruction in the air
eliminator vent tube. Clean the vent tube.
Cause Action