Gasboy 580 - Manual (Page 24)

GASBOY Series 580 Pumps
5-4 03/07/03
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.
Inaccurate delivery.
✓
Calibrate the meter (See Section 4).
A clock-fast error (more on the register than is delivered) in excess of 2 1/2% is due to air in the
suction line or vaporization of gasoline in the pump. Check pump for loss of prime and suction line for
air leak.
A clock-slow condition may result from: any slowing of the register or measuring chamber due to
excessive friction resistance or
mechanical failure; inadvertent bypassing of the measuring chamber.
Check register for zero setback; check reset lever return to top of slot in meter cover after setback;
check for "hang-up" of number wheels in register or gears not meshing.
Pump delivers product when not turned on.
✓
In aboveground storage tank, if fluid level is higher than pump, positive head pressure may force
product through pump. Install a pressure regulating valve or a solenoid valve in the supply line to the
pump.