RV Generator Repair in Zephyrhills

The RV generator is the component most damaged by the way rigs are used in Florida: run in season, then left to sit through six months of heat and humidity with fuel in it. That is why nearly every generator call we take in November comes down to fuel system contamination rather than anything mechanically wrong. Carburetor service runs $350 to $800, a full service $300 to $550, and no-output electrical work $400 to $1,200, all done at your park lot, storage yard, or driveway across Zephyrhills and east Pasco County. Trip fee $75 to $150. Full ranges on the pricing page.

What we handle on site

• Will not start: fuel, spark, compression, starter, and control diagnosis in that order.
• Starts and dies: usually fuel delivery, a blocked jet, or a fuel pump that has lost prime.
• Surging or hunting under load: carburetor, governor, or a partially blocked fuel path.
• No AC output with the engine running: brushes, capacitor, voltage regulator, or breaker.
• Runs rough, smokes, or will not take load: plugs, filters, air path, valve adjustment.
• Routine service: oil and filter, air filter, plugs, fuel filter, and a load test.
• Pre-hurricane-season checkout: fuel, start, load, exhaust, and the CO alarm.
• Exhaust and mounting concerns, which matter more than anything else on this list for safety reasons.

The Onan page covers the failure order on the units in most motorhomes.

Why a humid summer destroys generators

Modern pump gasoline with ethanol is not a storage fluid, and Florida makes it worse in two ways at once. Ethanol is hygroscopic: it pulls water out of the air, and from May into November the air here carries a dew point in the high 60s and low 70s with humidity above 90 percent every night. A vented fuel system breathes that air all summer. The ethanol absorbs water until it separates out of the gasoline and sinks to the bottom of the bowl, where the pickup is. Meanwhile the light fractions of the gasoline evaporate in the heat and leave a varnish that sets in jets measured in thousandths of an inch. Water in the bowl corrodes the aluminum from the inside.

The result is a generator that cranks fine and will not fire, or fires and dies, or runs and surges. All three are the same underlying fault and all three are fixed the same way: the carburetor comes off, gets cleaned or rebuilt, the fuel system gets checked back to the tank, and the stale fuel is dealt with.

The three things that prevent it, in order of effectiveness:

1. Run it monthly under load, about two hours. Nothing else comes close. A generator that runs regularly keeps fresh fuel in the bowl, burns off moisture, and keeps the windings dry.
2. Treat the fuel with a stabilizer if the rig genuinely has to sit, and run it long enough afterward to get treated fuel through the carburetor.
3. Shut the fuel off and run the bowl dry before long storage on units that allow it.

An owner who does the first one essentially never calls us about a generator that will not start. If you are leaving in April, this is the item on the departure list that pays for itself.

Heat, humidity, and honest expectations

Generators are rated under standard conditions, and output falls as temperature and humidity rise. On a 90-degree August afternoon with the air saturated, your unit is not making its nameplate number. If your generator has always struggled to carry two rooftop air conditioners in summer, that may be arithmetic rather than a fault, and we will tell you so rather than selling a rebuild.

Related: starting two ACs simultaneously is what trips generators. Staggering them, or fitting soft-start devices on the air conditioners, solves a great many “my generator cannot handle my rig” complaints for less than any generator repair.

Hurricane season is generator season

The Atlantic season runs June 1 to November 30 with a peak around September 10, and a parked rig with a working generator is a rig with a running fridge and a running AC when the park’s power goes down. Hurricane Milton in October 2024 knocked out power to more than 3 million customers across Florida. The generators that carried their owners through that week were the ones that had been run through the summer. A pre-season checkout in May or June, when the schedule is open, is a trip fee and an hour: fuel condition, start, a load test, exhaust integrity, and the CO alarm.

The safety part

Two things we will always raise, whether or not you asked:

Exhaust. A generator exhaust leak or a corroded tailpipe on a motorhome is a carbon monoxide risk, and RV generator exhaust systems live in a wet, salty, harsh environment underneath a vehicle. If we see one, we will tell you, and we will recommend not running it until it is dealt with. During an outage, never run a generator with the exhaust anywhere near an open window, yours or your neighbor’s, and in a 55+ park the neighbor is eight feet away.

CO alarms. Check that yours works and is within its service life. They expire. This is free advice and it is the most important sentence on this page.

Pricing

The same approach as every other job on our pricing page: diagnosis first, then a written number you approve before any work starts.

How a generator call runs

Tell us the make and model, whether it cranks, whether it fires, and when it last ran. Tell us how old the fuel is; that answer alone usually points at the fix. On site, we check fuel, spark, and compression in that order, then the electrical side if the engine runs and the output does not. Most carburetor work closes in one visit. If the stale fuel has to come out of the main tank, we tell you before we start, not after.

Where we work

On site across Zephyrhills, Dade City, Wesley Chapel, San Antonio, Land O’ Lakes, Lutz, and Plant City. The repair cost calculator gives you a range before you call, and if the rig has other problems after a summer sitting, the general mobile repair page covers the rest of the arrival checklist.