A portable inverter generator is often stored for long periods and then expected to work instantly during outages, so fuel system condition is the biggest reliability factor. Common issues include carburetor clogging from stale fuel, fuel lines/valves, recoil starter wear, and inverter/control electronics.
Repair is usually worthwhile because quality generators are expensive and many failures are serviceable under the threshold (carb cleaning/rebuild, starter parts, fuel system refresh). Replacement becomes the better choice when the inverter module fails, the engine has low compression, or repeated fuel-system problems persist despite proper storage-those can indicate deeper wear or contamination.
Usage pattern matters: light emergency use with good fuel practices can keep costs low for years, while frequent heavy loads accelerate wear. If the generator is older and you need multiple major repairs at once, replacing can restore confidence during outages and may add improved safety features.