Dust Bunnys and Spider Webs a cautionary tale

The big thing is the type of extinguisher for the fire you're fighting. A gas fire can respond to CO2 or dry chemicals best, but sometimes water is effective (this line of thinking may have changed in recent years). I prefer CO2 extinguishers to dry chem or water solely because the chemicals leave nasty powder residues that may or may not be cleanable\salvageable and water mixed with electrical or oil tends to make a problem worse. They also need to be checked every 6-12 months, the local fire department is usually pretty good about this provided you aren't expecting them to do 20 or 30 of them for you.

That said if I'm working underhood and there's fuel around, fire blankets are very good to have around. Smother the whole thing. This is what the engine underhood insulation on most cars made after the 1960s is designed to do.

 

Training keeps a fuel fire from being deadly. I'm not able to simply tell you what you can do, other than using a dry chem extinguisher. Your objective is to 'smother' the fire with it, or simply get way away, call the FD, let them handle it. But, you did do one thing, you shut off the fuel feed. Ensure the pump is either just outside of, or inside, the tank, so that when you cut the power, it halts the fuel flow. If you have a mechanical pump, shut off the engine.