10
ATD-50012 (FPM-12) TROUBLESHOOTING
PROBLEM CAUSE SOLUTION
Motor runs but
pump will not prime
Motor rotation wrong. Check wiring instructions for possible problems
Missing relief valve o-ring seal (16) Remove gear cover (6), inspect seal, replace if missing or damaged
Sheared drive key (9) Remove cover (6) and inspect key, replace if worn or sheared
Dirt under by-pass valve (17) or seal (16) Remove cover (6) and inspect, clean or replace if damaged
Strainer seal (3) leaking Inspect and replace if damaged
Suction height too high to prime See Priming Pump, page 5
Worn or damaged gears (8) Remove cover (6) and inspect gears. Replace if worn or damaged
Fuel level low R
Cover seal (7) damaged Replace if worn or damaged
Inlet strainer (4) clogged Remove and clean or replace
Air leak in suction tube (40) Inspect all joints in suction tube. Make sure all joints in suction tube are sealed
and that there are no cracks from over-tightening
Air lock in system
-
Motor does not run at proper speed Check electric connections. Check supply voltage for proper voltage level
Curb Pump Auto Nozzle used Change to Auto Nozzle for use with Electric Fuel Pumps
Unit pumps but
Clogged inlet strainer (4) Clean or replace
Air leak in suction tube (40) Check to make sure all joints in suction tube are sealed and that there are no
cracks
Suction tube (40) too close to tank bottom Suction tube must have a 2 in. (50 mm) minimum clearance
Tank empty R
Tank not vented Tank must be vented to atmosphere
Worn or damaged gears (8) Remove cover (6) and inspect gears. Replace if worn or damaged
Damaged motor (21) Replace motor
Clogged suction tube (40), hose (41) or
nozzle (42)
Inspect and clean
Curb Pump Auto Nozzle used Change to Auto Nozzle for use with Electric Fuel Pumps
Motor stalls when
nozzle is closed
Bypass relief valve (17) stuck Inspect relief valve, making sure poppet is free. Replace if damaged
Low supply voltage Check supply voltage
Gears (8) damaged and binding Inspect gears. Gears should turn freely. Replace if damaged
Faulty motor (21) Replace motor
Fuel leaking in
motor mount
Faulty or damaged motor shaft seal (15) Replace shaft seal
Operating pump extended time with nozzle
closed
Do not exceed 5 minutes of operation with nozzle closed
Motor shaft worn Replace motor if shaft has worn in seal area
Motor overheating
Gears (8) binding Check to make sure gears turn freely on shaft
Operating pump extended time with nozzle
closed
Do not exceed 5 minutes of operation with nozzle closed
Clogged inlet strainer (4) Clean or replace, see Maintenance, page 5
Clogged suction tube (40), hose (41) or Inspect and clean if required
Operating pump more than 30 minutes
continuous duty
Limit operation to 30 minutes per hour
Switch will not turn
pump on
Blown fuse Replace fuse. 30 amp automotive fuse
Electrical problem Check that supply voltage is proper and getting to pump
Defective switch (27) Check and replace if defective
Mechanical problem Check switch actuator cam. Cam should be actuating the switch
Damaged or defective motor (21) Check motor, replace if damaged or defective
nozzle (42)
