Gasboy 70 Series User Manual
Page 29
Service and Troubleshooting
MDE-4423B Series 70 and 1800 Consumer Elect Pumps Installation/Operation/Parts
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July 2005
5-3
TROUBLESHOOTING
If problems are encountered in operation of the pump, follow the procedures below in an attempt
to isolate the problem. When the problem is detected, follow the procedures for disassembly of
the pump.
Pump will not Start
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Is the breaker at the panel turned on?
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Is the Aux AC Control wire capped or connected to a solenoid valve or fuel management system?
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Is there power at pump? Check at junction box. Voltage cannot be below 104 volts on a
115V pump;
204 on a 230V pump.
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Is switch rod turning the switch on and off at the motor?
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Is motor overheated (thermal switch cutoff)? Be careful, the external motor surface could be
hot
enough to be painful or cause injury. Let cool and re-try.
!
Replace motor if above checks do not solve the problem.
Pump hums but will not start.
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Is voltage adequate? Check voltage with pump on bypass with nozzle closed. Voltage
cannot be
below 104 volts on a 115V pump; 204 on a 230V pump.
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Is the Aux AC Control wire is capped or connected to a solenoid valve or fuel management system?
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Check rotor, vanes, and bypass valve for free operation. Check motor with rotor and vanes
removed;
shaft should turn easily and smoothly by hand. Spin shaft by hand clockwise,
quickly start motor
(hand clear of shaft) and observe shaft - shaft should stop clockwise
motion and turn in a
counterclockwise direction; if it does not, replace motor.
!
Replace motor if above checks do not solve the problem.
Pump runs but will not prime or deliver product.
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Is there gas in tank?
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Do you have a nozzle with the anti-drain valve removed? (Must be able to blow air through
the nozzle
in the direction the fuel flows through it when the nozzle handle is held open.)
Use GASBOY P/N
038519 for unleaded and 038520 for diesel.
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Loosen pump cover and slide aside so you can observe the rotor and vane movement inside
the
pump cavity. Rotor should be turning freely in a counter-clockwise motion. If rotor turns
clockwise,
motor is bad.
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If register is recording but no product is being dispensed, you may have a supply line air
leak.
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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.
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Are bypass, strainer, and check valve cover plates flat? They could be bent from excessive
pressure
created by a vehicle running over the hose.
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Is there an air leak in the suction line below check valve. Make accuracy check using 5 gallon
Seraphim test can. Any clock fast error (see Inaccurate Delivery) 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.