RV Generator Maintenance in Sebastian
Keep your generator running strong with scheduled maintenance. Oil changes, filters, spark plugs, fuel system service, and load testing. On-site across Indian River County for Onan, Cummins, and Generac units.
The Short Version
- Preventive maintenance only: oil, filters, spark plugs, fuel service, and load testing
- We service Onan, Cummins, Generac, and other major RV generator brands
- Pricing ranges from $75 for an oil and filter change to $450 for a comprehensive service package
- Manufacturers recommend service every 100 to 150 hours or annually, whichever comes first
- We do not rebuild generators or do internal mechanical repair. Maintenance only.
What We Do and Why It Matters
Your RV generator is an engine, and like any engine, it needs regular maintenance to run reliably. The difference is that most people drive their car every day and see the odometer climbing toward the next oil change. Your generator sits in a compartment, often out of sight and out of mind, until you need it. Then you press the start button and hope it fires up. Regular maintenance is what makes the difference between a generator that starts on the first try and one that leaves you without AC on a 95-degree day at Sebastian Inlet State Park.
We provide scheduled RV generator maintenance. That means oil and filter changes, spark plug replacement, air filter service, fuel system inspection, and load testing. This is preventive work designed to keep your generator running at peak performance and catch small problems before they become expensive failures. We do not rebuild generators, replace internal engine components, or do major mechanical repair. If your generator needs that level of work, we will diagnose the issue, explain your options, and refer you to a generator specialist.
Florida's climate creates specific challenges for RV generators. The heat makes oil break down faster, reducing its ability to protect engine components. Sebastian's humidity promotes condensation inside the crankcase, fuel tank, and exhaust system, especially on generators that sit idle for weeks at a time. Ethanol-blended gasoline, which is standard at every Florida gas station, absorbs water and degrades within 30 to 60 days if left unstabilized. Salt air from the coast corrodes electrical connections and exhaust components.
Most of the generator failures we see could have been prevented with basic maintenance. A $75 oil change prevents a $2,000 bearing failure. A $65 spark plug replacement prevents a hard-start condition that leads to starter motor damage. A $45 air filter swap prevents the lean fuel mixture that overheats the engine. The math is simple: spend a little on maintenance now or spend a lot on replacement later.
We service all major RV generator brands, but about 80 percent of the units we work on are Onan (now Cummins Onan). Their QG series gasoline generators and QD series diesel generators are the OEM choice for most RV manufacturers. We carry the correct Onan oil filters, air filters, and spark plugs on our service truck so we can complete most maintenance visits in a single trip.
Every maintenance visit includes a load test. Running a generator without a load does not tell you much. We connect the AC units and other high-draw appliances, bring the generator up to at least 50 percent load, and check voltage output, frequency stability, and exhaust quality. If the numbers are off, we know something needs attention before you are relying on that generator in the field.
What We Offer
Four core generator maintenance services. Click any card for details and specific pricing.
Oil & Filter Change
Full oil drain and refill with manufacturer-specified oil, new oil filter, and dipstick level verification. Recommended every 100 hours.
View detailsSpark Plug Replacement
Remove and inspect old plugs, install new OEM-spec spark plugs, and verify proper gap. Recommended every 200 to 300 hours.
View detailsAir Filter Service
Air filter inspection, cleaning or replacement. We check the housing seal and intake path for debris. Checked at every oil change.
View detailsLoad Testing
Full load test with voltage and frequency monitoring. We verify output under real-world conditions with AC units and appliances drawing power.
View detailsRV Generator Maintenance Costs
All prices include on-site mobile service within a 30-mile radius of Sebastian. No hidden trip charges.
| Service | Price Range | Typical Duration |
|---|---|---|
| Oil & Filter Change | $75 - $150 | 30 - 45 minutes |
| Spark Plug Replacement | $65 - $125 | 20 - 40 minutes |
| Air Filter Service | $45 - $95 | 15 - 30 minutes |
| Load Testing | $95 - $200 | 30 - 60 minutes |
| Comprehensive Service (all of the above) | $250 - $450 | 1.5 - 2.5 hours |
| Fuel System Service (stabilizer + line inspection) | $75 - $150 | 30 - 45 minutes |
Final pricing depends on generator brand, model, and number of cylinders. Diesel generators typically cost slightly more for oil and filters. You always get an exact quote before work begins.
Four Steps to a Well-Maintained Generator
From your first call to a fully tested generator. Here is exactly what happens.
Call or text us
Tell us the generator brand, model, and approximate hours on the unit. We will bring the correct oil, filters, and spark plugs for your specific generator.
On-site inspection
We check the oil condition, air filter, spark plugs, fuel lines, and exhaust system. We note any issues that need attention beyond routine maintenance.
Maintenance service
We perform the scheduled maintenance: oil and filter change, spark plug replacement, air filter cleaning or replacement, and fuel system inspection.
Load test and verify
We run the generator under load, verify voltage output, check frequency stability, and confirm everything is operating within manufacturer specifications.
RV Generator Maintenance FAQ
Most RV generator manufacturers recommend a full service every 100 to 150 hours of operation or once a year, whichever comes first. In Florida, where many RV owners use their generators frequently during hot months for AC power, you may hit 100 hours faster than you think. A typical oil and filter change should happen every 100 hours. Spark plugs every 200 to 300 hours. Air filters depend on conditions but should be checked at every oil change and replaced at least annually.
If your RV will sit for more than 30 days, add a fuel stabilizer like Sta-Bil to the tank before shutting the generator down. Run the generator for 5 to 10 minutes after adding the stabilizer so it circulates through the carburetor and fuel lines. For gasoline generators, ethanol in Florida fuel attracts moisture and degrades within 30 to 60 days. Diesel generators are less sensitive but still benefit from stabilizer during extended storage. Never store a generator with an empty tank because moisture will condense inside and cause corrosion.
Onan (now Cummins Onan) is by far the most common RV generator brand. They dominate the built-in generator market and have been the OEM choice for most RV manufacturers for decades. Their QG series (Quiet Gasoline) and QD series (Quiet Diesel) are found in the majority of motorhomes and larger fifth wheels. Generac makes some RV generators, and Champion has entered the market with portable options. Onan parts are widely available, and most RV techs are trained on them. We service all brands, but about 80 percent of the generators we maintain are Onan units.
Run your generator under load for at least 30 minutes every month, even if you are not using the RV. This does three things: it circulates oil through the engine to keep seals and gaskets lubricated, it burns off moisture that accumulates in the fuel system and exhaust, and it exercises the electrical components under real load conditions. Running a generator without a load (no AC unit, no appliances) does not count. The generator needs to work under at least a 50 percent load to reach proper operating temperature and clear carbon deposits.
The most obvious signs are hard starting or failure to start, rough idle, fluctuating voltage output (lights dimming or flickering), black or excessive exhaust smoke, unusual noises like knocking or ticking, and the generator surging under load. If the oil on the dipstick is black and gritty rather than amber and smooth, it is overdue for a change. If you cannot remember the last time you serviced the generator, it is overdue. In Florida's heat, dirty oil breaks down faster and loses its ability to protect engine components.
RV generators produce carbon monoxide, which is odorless and deadly. Your RV should have a working CO detector. Test it monthly. Make sure the generator exhaust is clear of obstructions and the exhaust pipe is not damaged or leaking. Never run a generator inside an enclosed space. When parked, be aware of wind direction so exhaust does not blow into your RV or a neighbor's RV. NFPA 1192 requires CO detectors in all RVs. If your detector is older than 5 to 7 years, replace it. The sensors lose sensitivity over time.
Neglecting maintenance leads to a predictable failure sequence. First, dirty oil causes accelerated wear on bearings and cylinder walls. Then, clogged air filters reduce power output and increase fuel consumption. Old spark plugs cause misfires and hard starting. Stale fuel gums up the carburetor and fuel injectors. Eventually, the generator will not start at all or will run rough and fail under load. At that point, you are looking at a major repair bill or replacement. A generator that costs $75 to maintain annually can cost $2,000 to $5,000 to replace. Regular maintenance is the cheapest insurance you can buy.
We handle maintenance only. That includes oil changes, filter replacement, spark plugs, fuel system cleaning, load testing, and general service. We do not rebuild generators, replace internal engine components like pistons, crankshafts, or bearings, or do major mechanical repair on generator engines. If your generator has an internal failure, we will diagnose it, explain the issue, and refer you to a generator specialist or help you source a replacement unit. Our maintenance service is designed to prevent those major failures from happening in the first place.