Himoinsa Air in Fuel System / Loss of Prime

Generator cranks normally but will not start; no error code is displayed on the Himoinsa controller.

Advertisements

Possible Causes

Recent fuel filter change without proper bleeding, Small air leak on suction side, Empty day tank, Loose bleed screws on filter housing

How to Fix / Troubleshooting

Safety: Turn OFF generator and isolate battery. Work in a well-ventilated area away from ignition sources.

  • Check fuel supply: Confirm fuel level in main and day tanks. Open any isolation valves fully.
  • Bleed fuel system: Use the manual priming pump on the fuel filter housing. Open bleed screws on the filter and injection pump (if fitted) until fuel flows without bubbles, then tighten.
  • Inspect suction lines: Check hoses and fittings between tank and lift pump for cracks or loose clamps that could admit air. Replace or tighten as needed.
  • Attempt restart: Reconnect battery and perform a start. If the engine starts and then dies, repeat bleeding and recheck for air leaks.
Advertisements

Repair Difficulty

Easy 2/5

Required Part

Fuel Filter Assembly
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements