What Happens to an RV Generator When It Sits Too Long?
In Florida, generators spend a lot of time parked. A surprising share of our service calls trace back to storage rather than to use.
Fuel ages
Gasoline is not stable indefinitely. Over time it oxidizes, lighter components evaporate, and what remains can be harder to ignite and more prone to leaving deposits behind.
That's why a generator that shut down normally in the spring can refuse to start in the fall without anything having physically broken.
Ethanol-related concerns
Ethanol-blended fuel can attract and hold moisture, and it can affect some older fuel-system materials. How much this matters depends on the fuel, the storage duration and the specific components involved, but it is a real contributor in a humid climate.
Varnish and deposits
As fuel sits and evaporates, it leaves gum and varnish behind. In a carbureted unit, those deposits collect exactly where they cause the most trouble — in the small metering passages. See RV generator carburetor problems.
Batteries deteriorate
Batteries self-discharge while parked, and a discharged battery deteriorates faster. A weak battery can produce cranking that is too slow to start the engine, which then gets misread as a fuel or ignition problem.
Corrosion and moisture
Humidity, condensation and salt air work on connectors, grounds and exposed metal the entire time the coach sits. Corroded connections cause intermittent faults that are frustrating to chase later.
Exercising the generator
Running the generator periodically — under load, as your manufacturer directs — is the single most effective thing an owner can do to avoid these problems.
Recommended exercise intervals and durations vary by model, so consult the owner's manual for your specific generator rather than relying on a general rule from a forum. Your manual also specifies the maintenance intervals for oil, filters and plugs.
Consult your generator's owner manual for the exercise and maintenance intervals that apply to your exact model. Specifications vary by model and spec number.
Before you head out on a trip
If the coach has been parked for months, start and load the generator well before departure — not the night before. Finding a problem in your driveway is a service call. Finding it at a campsite is a much bigger inconvenience.
If it's been a season or more, annual generator service is the practical way to get it checked, serviced and load-tested at your RV.
Generator diagnosis can involve fuel, high temperatures, electrical power, and carbon-monoxide hazards. If you're not equipped to perform the testing safely, have the generator professionally diagnosed.
Frequently asked questions
- What happens when an RV generator sits for months?
- Fuel degrades and can leave varnish in small passages, batteries self-discharge, and moisture works on connections. The most common result is a no-start or a surging condition the next time you try to use it.
- How often should I run my RV generator?
- Follow the exercise interval in your generator's owner manual for your specific model. Running it regularly under load is what prevents most storage-related problems.
- Should I drain the fuel before storage?
- Storage recommendations vary by generator model and fuel system. Your owner's manual is the correct authority for your unit, and we're happy to go over the practical options during a service visit.
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RV generator problems can have several different causes that produce nearly identical symptoms. No Worries RV can diagnose the system at your RV and explain the repair options before the work proceeds.
Mobile RV generator repair throughout the Tampa Bay area