The standard tank holds 7.5 to 8 gallons of gasoline.
For extended outages, you will need to store stabilized fuel or consider a propane conversion kit (some GP5500 models come dual-fuel ready; check your local SKU).
Let us compare the 5500 Generac to its direct rivals:
The L14-30R 30-amp outlet is standard for RVs. You can power the entire RV—including roof AC, microwave, and converter—without tripping the main breaker. However, note that this generator is loud (approximately 70-75 dBA). It is not for quiet campgrounds; it is for tailgating or boondocking where noise is acceptable.
To avoid the "carburetor death" mentioned above, follow this strict schedule:
The "Dual Fuel" Mod: There is a thriving aftermarket for converting the 5500 Generac to propane. A $100 conversion kit allows you to run on propane tanks, which never go bad (gasoline turns to varnish). This solves the carburetor issue permanently but reduces running watts to roughly 4,950.
If your 5500 RPM Generac suffers a "rod knock" or loses oil pressure completely while running, do not rebuild it. The crankshaft is likely scored beyond repair, and the block is often damaged.
Real-world cost: A new short block for a 5500 RPM Generac costs $2,200–$2,800. Add labor ($1,000+), and you are better off buying a modern 3600 RPM or inverter generator.
Liquid cooling is great, but the 5500 RPM units use a small, high-speed water pump. If the pump seal fails or the belt breaks, you have about 60 seconds before the engine seizes.

