A generator needs fuel, oil, air and spark, plus a healthy battery for electric start. When one is missing it fails in a predictable way. Match your symptom to the list below, and always put safety first.
⚠️ Safety First
- Never run a generator in an enclosed space or near windows, vents or doors. Carbon monoxide kills.
- Make sure your RV has working carbon monoxide detectors.
- Shut the generator off and let it cool before refuelling, and don’t store fuel near ignition sources.
🧰 Tools & Materials
- Spark plug socket and a new plug
- Fresh fuel and fuel stabilizer
- Oil of the grade the manual specifies
- Air filter
- Multimeter
- Carburetor cleaner
📋 Step by Step
1 It won’t crank
Treat it like a car that won’t turn over.
- Check the starter battery voltage and the connections.
- Look at the oil level — many generators shut down or lock out when oil is low.
- Check the start switch, remote panel and fuse.
2 It cranks but won’t start
Fuel, air or spark is missing.
- Confirm there is fuel and that it is fresh; old gasoline varnishes in the carburetor. A stabilizer helps during storage.
- Inspect the air filter and replace it if it is dirty.
- Pull and check the spark plug; replace it if it’s fouled or worn.
3 It starts, then shuts down
The generator is protecting itself or starving.
- Check oil level first.
- Reduce the load; an overload trips protection.
- Clean the spark arrestor and, if fuel flow is suspect, clean or service the carburetor and fuel filter.
4 There’s no power in the RV
The generator runs but the loads are dead.
- Reset the generator’s breaker.
- Check the transfer switch and the RV’s main breaker.
- Test voltage at the generator outlet or its wiring terminals.
5 It runs rough
Hunting or surging usually means fuel or load.
- Replace the spark plug and air filter.
- Use fresh fuel and clean the carburetor.
- Run the generator under load for a while each month, as your manual recommends, to keep the fuel system clear.
🔧 When to Call a Professional
Stop and book a qualified technician if you see any of these:
- Carburetor rebuilds, governor or control-board faults
- Persistent surging after the checks above
- Loss of voltage or frequency under load
- Any smell of exhaust inside the RV
❄️ Generators in the cold
Cold oil thickens and batteries crank more slowly. Use the oil grade your manual lists for low temperatures, keep the starter battery charged, and warm the generator compartment if you can. Many campgrounds and parks set quiet hours for generators — check the rules before you plan to run one.