Go-Kart Fuel & Storage Guide
The Short Answer
Use fresh premium ethanol-free gasoline whenever possible and add fuel stabilizer to every tank. Premium gasoline containing up to 10 percent ethanol is acceptable when ethanol-free fuel is unavailable, but stabilize it and use it quickly. Do not keep gasoline longer than about two months. Prepare a machine for storage when it may sit for 30 days or longer.
Fuel recommendation
What Gas Should You Put in a Go-Kart?
For TrailMaster go-karts and mini bikes, fuel freshness matters as much as the grade printed on the pump. Buy fuel from a busy, reputable station and store it only in a clean, approved gasoline container.
GoKartMasters Fuel Rules
Why Ethanol-Free Fuel Is Preferred
Small recreational engines often sit between rides, use vented fuel systems and contain small carburetor passages. Fuel containing ethanol can absorb moisture and can leave deposits as it ages. That does not mean an owner is stranded when ethanol-free gasoline is unavailable.
Ordinary premium gasoline containing up to 10 percent ethanol is acceptable. Add stabilizer, keep the container sealed and use the fuel before it becomes old. Storage preparation matters even more when the fuel contains ethanol.
Fuel Safety
- Use only approved gasoline containers and follow applicable laws for handling and storage.
- Keep gasoline away from flames, sparks, heaters, pilot lights and smoking materials.
- Turn the engine off and let hot engine and exhaust components cool before refueling.
- Refuel outdoors or in a well-ventilated area. Wipe spills immediately and do not start the engine near spilled fuel.
- An adult should handle the gasoline and supervise the entire process.
- Never siphon gasoline by mouth.
Before filling the tank
A Better Refueling Routine
Thirty days or longer
Prepare the Machine for Storage
If the go-kart or mini bike may sit for 30 days or longer, do not simply park it with old fuel. Stabilize fresh gasoline first so treated fuel reaches the system, then remove the fuel before storage.
Carbureted Machines
After treated fuel has circulated, drain the fuel tank and run the engine until it dies. This is sufficient for normal storage preparation; owners do not generally need to open the carburetor bowl.
Mini, Mid and many mini-bike models have a fuel valve at both the tank and engine. Use the exact model instructions when shutting off and draining the system.
EFI Machines
Draining the fuel is also the best practice for EFI models during long-term storage. EFI uses a pressurized pump, injector and additional electrical components, so use the exact model procedure.
Do not open pressurized fuel lines, disconnect injectors or improvise an EFI draining method. Contact GoKartMasters when the model instructions are unclear.
Where Should the Drained Fuel Go?
Never dump gasoline onto the ground, into a drain or into household trash. Store usable fuel safely in an approved container or take unwanted fuel to an appropriate local household-hazardous-waste facility. Follow local requirements for transport and disposal.
Check fuel before buying parts
Symptoms of Old or Contaminated Fuel
The Machine Will Not Start After Sitting
- Confirm the tank contains fresh, correctly stabilized gasoline.
- Verify every applicable fuel valve is in the ON position.
- Use the correct model-specific choke or EFI starting procedure.
- Check the battery, terminals and grounds on electric-start and EFI models.
- Inspect the fuel line, filter, tank vent, carburetor or EFI connections before replacing parts.
- Stop repeated cranking when the basic checks do not identify the problem. Continue with structured troubleshooting.
GoKartMasters Field Notes
The Fuel Mistakes We See Most Often
The fuel valves are off
This simple issue causes many first-start and restart concerns. Learn which valves your exact machine uses.
Fuel sat in the carburetor
A small amount can create problems after only a few weeks. Stabilizer helps, but storage preparation is still important.
The last splash was poured in
The bottom of a fuel can is where settled water and debris collect. Leave that final questionable portion behind.
A carburetor is replaced too soon
Confirm fresh fuel, valve positions, choke use, venting and fuel flow before assuming an expensive component has failed.
Returning the Machine to Service
- Inspect the machine for rodent damage, nests, chewed wiring, corrosion and leaks.
- Check engine oil, air filter, tires, brakes, throttle return, steering, chain and safety equipment.
- Confirm the battery is fully charged and connections are secure.
- Add a small quantity of fresh stabilized fuel.
- Turn on every applicable fuel valve and use the correct starting procedure.
- Warm the engine for about one minute, then complete a slow brake-and-throttle test before normal riding.
Fuel and Storage Questions
What is the best gasoline for a TrailMaster go-kart?
GoKartMasters recommends fresh premium ethanol-free gasoline whenever available, with stabilizer added to every tank.
Can I use gasoline containing ethanol?
Yes. Premium gasoline containing up to 10 percent ethanol is acceptable when ethanol-free fuel is unavailable. Stabilize it, keep the container sealed and use it promptly.
Should I add stabilizer only for winter storage?
No. GoKartMasters recommends adding stabilizer to every tank because fuel can remain in small carburetor passages and fuel-system components between rides.
How long can gasoline sit in a go-kart?
Do not use gasoline older than about two months. Prepare the machine for storage whenever it may sit for 30 days or longer.
Should I store a carbureted machine with a full tank?
No. For storage of 30 days or longer, circulate stabilized fuel, drain the tank and run the engine until it dies so the carburetor is emptied.
Should an EFI go-kart be drained for storage?
Yes. Draining fuel is the best long-term-storage practice for EFI machines too, but the pressurized system requires the correct model procedure. Do not casually disconnect EFI lines or components.
Stop and make the area safe
Fuel Leaks Are Not Normal
Do not start or ride a machine with a fuel leak, strong unexplained gasoline odor, damaged tank, loose fuel line or wet electrical component. Move ignition sources away, ventilate the area and repair the cause before operating the machine.
GoKartMasters customers can text 605-368-1612 or email support@gokartmasters.com. Include the purchaser name, order number, exact model, photographs and a description of where the fuel appears.
Continue Learning
General guidance for TrailMaster go-karts and mini bikes. Follow the warning labels, owner manual and model-specific instructions supplied with the exact machine when they differ. Reviewed by GoKartMasters in August 2026.
