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Troubleshooting
DANGER
Disconnect all power prior to performing any service or maintenance. Failure to disconnect the power may cause electrical shock, or unexpected
starting of the motor, resulting in injury or death.
WARNING
DO NOT open or attempt to repair the motor on your NX25‑120 or NX25‑240 series pump. Opening the motor case can compromise the integrity
of the Explosion Proof construction and will void any existing warranty and certification (UL listing). Please refer to the Warranty Policy
located on page 2.
This Troubleshooting Guide provides basic diagnostic assistance. If you have further questions, contact us at 1 (800) 720‑5192 (M‑F 8 AM–5 PM ET), or at fillrite.com.
Symptom
Cause
1. Suction line problem
2. Vanes sticking
3. Excessive rotor, vane, rotor cover, or housing wear
Pump will not prime
4. Inlet / Outlet blocked
5. Excessive vertical or horizontal inlet plumbing
6. Bypass valve stuck
1. Excessive dirt in screen
2. Suction line problem
3. Excessive rotor, vane, rotor cover, or housing wear
Low capacity
4. Hose or nozzle damage
5. Low fluid level
6. Clogged outlet filter
1. Pump in bypass
2. Vanes sticking
Pump runs slowly
3. Motor problem*
4. Excessive outlet restrictions
1. Short in wiring
2. Excess rotor or vane wear
Motor stalls / breaker trips
3. Pump rotor lock‑up*
4. Debris in pump cavity
Bold text indicates repairs that are not serviceable by the owner; please refer to our Warranty Policy on page 2 for further instructions.
*This condition will shut the motor off.
fillrite.com
NX25-120 & NX25-240 SERIES AC FUEL TRANSFER PUMPS
INSTALLATION AND OPERATION MANUAL
Solution
Check suction line for leaks or restrictions; it may be too small in diameter, too long,
or not air‑tight
Check vanes for nicks, damage, obstructions, or excess wear; replace as necessary
Inspect rotor, vanes, rotor cover, and housing for excess wear; replace as necessary
Check pump, hose, nozzle, and filter / strainer for blockage
Reduce vertical or horizontal distance from pump to liquid
Open valve, remove debris
Remove and clean screen
Check suction line for leaks or restrictions; it may be too small in diameter, too long, not
air‑tight, or too low vertically
Inspect rotor, vanes, rotor cover, and housing for excess wear; replace as necessary
Replace hose or nozzle
Refill tank
Replace filter
Normal operation; pump naturally reduces speed in bypass mode
Check vanes for nicks, damage, obstructions, or excess wear; replace as necessary
Refer to Warranty Policy
Reduce outlet restrictions (e.g. use shorter hose, remove swivel)
Inspect electrical wiring for shorts and replace as necessary
Check vanes for nicks, damage, obstructions, or excess wear; replace as necessary
Clean and inspect rotor and vanes; replace as necessary
Clean debris from pump cavity
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