Table 3-3. Unit Troubleshooting - Continued
TEST OR INSPECTION
ENGINE RUNS ROUGHLY OR STOPS - Continued.
Check for damaged or loose engine fuel line fittings.
Tighten all loose fuel line fittings. Replace all damaged fuel lines (see paragraph 3-14).
Check for clogged engine air filter.
Check for contaminated fuel.
If fuel is contaminated, drain engine fuel tank and refill with fresh leaded or unleaded regular gasoline.
Check for fouled spark plug.
Remove spark plug. Inspect for carbon build-up or fuel fouling.
Clean, regap to 0.030 in (0.750 mm) and replace spark plug.
Check for engine overheating.
Step 10. Check for malfunctioning engine fuel pump.
Disconnect output side of engine fuel pump and pull out starter rope. If fuel does not exit output side of fuel
Step 11. Check for clogged muffler.
Remove muffler and inspect for carbon build-up or clogging. Replace clogged muffler (see paragraph 3-24).
Step 12. Check for clogged fuel lines or fuel filter.