Bennett 111103, Operation, Service & Parts Manual

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Bennett T140 Operation, Service, & Parts Manual Troubleshooting
16
HOW TO CORRECT PROBL EMS ON PUMPING UNITS
Use the table in each section to determine the cause and solution.
PROBLEM 1: THE MOTOR STARTS BUT THE PUMP DOES NOT DELIVER FUEL.
Refer to the table below for a description of various causes of the problem and the solution.
Cause Solution
The fuel supply is below the suction stub in the storage tank. Fill the storage tank.
The vent pipe is plugged in the storage tank. Clean the vent pipe.
The strainer screen or filter assembly has an obstruction. Remove obstructions from the screen or filter assembly.
The bypass valve is not seating properly due to the wear or
obstruction. Check the valve for an obstruction causing the valve to stay open, and/or
replace the bypass valve.
The v-belt is loose or broken. Adjust or replace the v-belt.
There is an obstruction in the atmospheric float valve. Clean the float and valve area. Check for swelling and binding in the linkage.
The pump is out of prime. All fuel drained out of suction line
due to fault line check or foot valve. Check for a faulty foot valve in the storage tank or a faulty check valve in the
suction line.
The suction line is leaking. Start the pump and open the nozzle. If bursts of air are felt while holding a
finger on the vent tube, the suction line is damaged. Repair or replace.
The intake line, foot valve, angle check valve, or vertical check
valve has an obstruction. Connect a vacuum gauge to the ¼” plug on the filter cover. Turn the pump on
and open the nozzle. A reading of 15 or more inches of mercury with no flow
indicates a complete blockage in the suction line. Clean the line or replace.
The suction stub in the storage tank is on the bottom of the
tank. Make sure there is a three-inch clearance.
The control valve has an obstruction. Clean the control valve. It must slide freely in the valve cavity.
The nozzle is not working. Replace the nozzle.
*Two pumps are connected to one storage tank with one
suction line. There is a faulty check vale in one of the supply
lines.
* Not recommended Disconnect the vent tube on the idle pump. Install a short copper tube. Place
the end of the copper tube in a container of liquid. If the liquid is drawn out of
the container when the opposite pump is operated with an open nozzle, the
line check valve is faulty. Replace the check valve.
Figure 17