TL;DR
- Scheduled RV generator maintenance typically takes 1 to 3 hours depending on service type and generator condition.
- Basic oil and filter changes start around $75. Full tune-up and load testing runs $200-$350.
- Florida's heat, humidity, and salt air around Stuart accelerate wear and can extend service time.
- Same-day and next-day appointments are often available across 16 cities on the Treasure Coast.
- Our RVIA-certified team has completed 4,100+ repairs since 2013. Call (772) 677-1583 to schedule.
Most RV generator maintenance visits in Stuart, FL take between 1 and 3 hours for a scheduled appointment. A basic oil change and filter swap on a common Onan generator is usually done in 60 to 90 minutes. Add a spark plug replacement, fuel stabilization treatment, and a load test, and you're looking at closer to 2 to 3 hours. If we find something unexpected during the inspection, like a clogged carburetor or a failing voltage regulator, that can push the job into a half-day service.
We've been doing this since 2013 here on the Treasure Coast, and the South Florida climate is genuinely harder on generators than most RV owners realize. The combination of heat, humidity, and salt air that rolls in off the St. Lucie River and the Atlantic shoreline near Stuart puts extra stress on seals, fuel lines, and electrical connections. That's a big reason why our team at Treasure Coast RV Repair schedules a full visual once-over as part of every generator maintenance call. Catching a small issue early is always faster and cheaper than dealing with a generator that won't start the night before a trip.
What a Standard RV Generator Maintenance Appointment Actually Covers
When you book a generator maintenance visit, there are several tasks our certified technician works through in sequence. A typical scheduled service includes an oil and filter change, spark plug inspection or replacement, air filter check, fuel filter inspection, coolant level check (on liquid-cooled units), and a visual inspection of all wiring and exhaust components.
After the hands-on service work, we run a load test. A load test (defined as: connecting a calibrated electrical load to verify the generator produces its rated wattage under real operating conditions) is one of the most important steps and often the one skipped by owners doing DIY maintenance. It takes about 15 to 20 minutes on its own but tells us whether the generator is actually performing to manufacturer specs under RVIA guidelines. We also apply fuel stabilizer if the rig has been sitting, which is extremely common with the seasonal RV patterns we see in Martin County.
If you want to see how generator maintenance fits into your overall RV service budget, our Treasure Coast RV Repair Cost Guide breaks it all down.
How Long Does RV Generator Maintenance Take? A Realistic Breakdown
The honest answer depends on what type of service your generator needs. A simple oil and filter change on a mid-size Onan RV QG unit takes most experienced technicians around 45 to 75 minutes. Factor in drive time to your location across Martin County or Indian River County, a quick pre-service walkaround, and paperwork, and a basic appointment is comfortably a 90-minute visit door to door.
A full tune-up that includes spark plugs, air filter, fuel filter, oil change, and a load test runs 2 to 3 hours. If we find corroded connections (very common in the salt air environment near Stuart and Jensen Beach), a stuck fuel solenoid, or a carburetor that needs cleaning, that can add another 60 to 90 minutes. We always call before proceeding with any additional work beyond the quoted service so you're never surprised.
Emergency no-start situations, where the generator simply won't fire before a trip or during a Florida summer power outage, take longer because diagnosis comes first. Plan for 2 to 4 hours for an unscheduled emergency call, though we work fast and our team carries common parts on the service vehicle.
We Come to You Across the Treasure Coast
Our mobile service model means you don't have to haul your rig to a shop. Danny Vasquez and our team travel to RV parks, driveways, and storage facilities across 16 cities in St. Lucie, Martin, and Indian River counties. If you're parked at a spot near the Phipps Park campground area in Stuart or staged for a trip heading south, we can come to you.
Mobile service does add a small window to the overall appointment time since we factor in travel, but it saves you hours of towing coordination and keeps your RV right where it lives. Same-day scheduling is often available, especially for generator-related calls during the busy summer season.
Pro Tip: Run Your Generator Monthly
Even if you're not actively camping, run your RV generator under at least a 50% load for 30 minutes every month. In Florida's humidity, generators that sit unused develop fuel varnish in the carburetor and moisture in the oil faster than in drier climates. This one habit alone prevents a large percentage of the no-start calls we get from Stuart and Martin County RV owners every summer. If you're storing your rig seasonally, ask us about fuel stabilization treatment, which we include in most maintenance visits.
What Causes Generator Maintenance to Take Longer Than Expected
Several factors can stretch a routine maintenance call into a longer job. The most common one we see on the Treasure Coast is deferred maintenance. If an Onan generator hasn't had an oil change in two or three years, the oil is usually thick and dark, the filter is caked, and the spark plugs may be fouled. Cleaning up that condition properly takes more time than a generator that's been serviced on schedule.
Florida's environment plays a big role too. Salt air corrosion on battery terminals, wiring connectors, and exhaust components is something we see constantly in rigs that spend time near the Stuart coastline. Corroded connections can cause intermittent performance issues that take time to trace and repair correctly. UV degradation of fuel lines is another Martin County reality that adds inspection time.
Onan generators (the brand used in most Class A and Class C motorhomes) have specific service intervals outlined in their operator manuals, typically every 150 hours or annually. Going beyond those intervals means more to address. Our team checks the hour meter at the start of every call to flag any overdue items before we begin.
| Service Type | Typical Time | Estimated Cost |
|---|---|---|
| Oil & Filter Change Only | 60-90 minutes | $75-$120 |
| Spark Plug Replacement | 30-45 minutes | $50-$90 |
| Air & Fuel Filter Service | 20-30 minutes | $40-$75 |
| Full Tune-Up (Oil, Plugs, Filters) | 2-3 hours | $180-$275 |
| Load Testing | 15-20 minutes (add-on) | $50-$75 |
| Fuel Stabilization Treatment | 10-15 minutes (add-on) | $30-$50 |
| Full Maintenance + Load Test + Diagnosis | 3-4 hours | $250-$350 |
Pricing Disclaimer
All prices shown are estimates based on national averages and our service history. Actual costs may vary depending on current market conditions, parts availability, your specific RV model, and the scope of work required. The only way to determine your final cost is through an on-site diagnosis by our certified technician. Call (772) 677-1583 for a free estimate.
Emergency vs. Scheduled Generator Service: What's the Timing Difference in Stuart?
Scheduled generator maintenance is almost always faster from start to finish. When you book in advance, our technician arrives with the right oil weight for your specific generator model, the correct filter, and any parts flagged from your service history. There's no wasted time sourcing parts or diagnosing unknown symptoms. Most scheduled visits in the Stuart area are wrapped up within the first appointment.
Emergency calls work differently. If your generator won't start the morning of a planned departure, or it dies mid-trip and you're staged somewhere in Martin County, we prioritize getting to you as fast as possible. But diagnosis takes time. We have to systematically rule out fuel delivery issues, ignition problems, load faults, and low-oil shutdown triggers before we know what parts we need. That process alone can take 45 to 90 minutes before any repair work begins.
Same-day availability on the Treasure Coast is real, but it's not guaranteed during peak summer season when heat-related generator calls spike. If you know your generator is overdue for service, booking ahead is always the smarter move. It's also worth reading our Treasure Coast RV AC Survival Guide since AC and generator health are closely connected in Florida summers.
RVIA-Certified Service You Can Count On
Danny Vasquez founded Treasure Coast RV Repair in 2013 with a focus on doing the job right the first time. Our technicians are RVIA certified and trained on all major generator brands including Onan, Generac, and Kohler, following manufacturer service specs and NFPA 1192 standards for RV systems.
With 4,100+ completed repairs and a 4.9-star rating across 267 Google reviews, our track record speaks for itself. Whether it's a routine generator maintenance visit or a same-day emergency call somewhere across the Treasure Coast, we show up prepared and get the work done correctly.
How to Know When Your RV Generator Is Due for Service
Most RV generator manufacturers, including Onan, recommend service every 150 operating hours or once per year, whichever comes first. If you're running your generator frequently in Stuart's summer heat to power your AC unit, you could hit 150 hours well before the calendar year is up. We always check the hour meter when we arrive and let you know exactly where you stand.
Beyond the hour meter, there are warning signs worth watching for. These include longer-than-normal crank times before the generator fires, any visible smoke at startup (blue smoke typically points to oil burning, white smoke to moisture or coolant), unusual vibration, or a generator that runs fine at idle but struggles when the AC kicks on. That last symptom often points to a load test failure waiting to happen.
If your rig is relatively new to you and you're not sure of the service history, a pre-season inspection is a smart call. Our RV Pre-Purchase Inspection Guide covers what to look for on used rigs, and the same logic applies to generator condition checks any time of year.
Questions about rv generator maintenance on the Treasure Coast? Call (772) 677-1583 and ask for Danny. Free estimates, same-day service available.