Gasboy 580 Series - Manual (Page 30)

Maintenance and Troubleshooting Troubleshooting
Page 26 MDE-4766 Series 580 Installation/Operation/Parts Manual · April 2009
Pump Runs but Does Not Prime or Deliver Product
Is there fuel in the tank?
If register is recording but no product is being dispensed, you may have a supply line air
leak.
Check for an air leak on suction side of pump. Is check valve seated properly?
Reassemble and prime pump using liberal quantity of motor oil in pump cavity; if it
primes, run pump full flow and snap nozzle closed; shut off motor and check for leak on
suction side of pump above check valve. Any observed liquid leakage would indicate an
air leak when pump is running with nozzle open and would prevent priming when pump
was empty.
Is there an air leak in the suction line below check valve. Make accuracy check using 5
gal Seraphin test can. Any clock fast error (refer to
“Inaccurate Delivery” on page 27 ) in
excess of 2-1/2% indicates an air leak in the suction line. The most common source of an
air leak in the suction line is the union - check union for alignment and tightness before
checking balance of suction line. If pump does not prime using oil, suction line is
blocked or has a severe air leak.
Pump Delivers Product but Does Not Register
Is main totalizer recording? If yes, problem is in the register assembly. Check to ensure
that the reset mechanism is working properly. Reset button should return fully to its
original position after being pressed. The reset lever (that is activated by the reset button)
should also return to its original position.
If the main totalizer is not working, the problem could be a broken/jammed measuring
chamber or a jammed pulser drive. If the unit has a pulser, check to ensure that the pulser
drive operates freely. Excessive drag exerted by this assembly will lock up the register
and totalizer.
Pump Delivery is Slow
Check for dirty strainer.
If pump has a filter, change filter.
Check for supply line restriction by testing the pump with a vacuum gauge. If vacuum is
abnormally high, there is a restriction.
Pump Loses Prime
Inspect check valve poppet and seat for clean mating surfaces.
If, after a period of non-use, a pump delivers product initially, followed by air and then
full flow, there is an air leak in the suction line.
Install pressure gauge between hose and nozzle. Operate pump at full flow. Snap nozzle
closed and turn off pump. If pressure falls to zero rapidly, replace check valve and clean
and inspect valve seat.