Symptoms of bad fuel and what to do if the fuel has gone bad.
Symptoms of Bad Gas in a Car or Truck
Engine Does Not Start
Engine Starts but Run Rough
Engine Stalls Out
Hard to Keep Engine Running When Idling
Hard to Accelerate

How To Tell If Gas is Bad?
Very Dark Color
Worse Smell than Usual
More Thick than Usual
Contaminants in Gas Such as Sugar, Water, or Sand
The wrong gas added to the vehicle such as diesel would also be a contaminant.

What To Do If Gas Is in a Vehicle for a Long While?
Use a Gas Stabilizer
Drain and Flush the Gas Tank
Replace Fuel Tank Sending Unit
Replace Fuel Pump
Replace Fuel Filter
Flush Fuel Lines

By using this information user assumes all risk of use.
https://www.backyardmechanic.org/symp...