Pump Operates With No Fuel Discharge
If pump operates correctly and continuously with no fuel delivery, probable causes may be as follows:
- Air leak (s) in suction side of pump system. Check for loose or leaking fittings, ruptured fuel line, leaking sealing washers at pump valves.
- Dirt lodged under one of the valves (particularly the intake valve).
- Worn, defective, or damaged valves or valve seats. Scrap worn valves. If valve seats are pitted, the cage or pump body must be replaced.