When you’re on the go, your car’s engine is sucking in fuel like Takeru Kobayashi inhaling a platter of hot dogs. Handling that heavy load, your fuel pump sends fuel from the gas tank to the engine.

I love your magazine, and all of the how-to articles I find fascinating. Well, here is my question. I am finding a rust-colored powder in my fuel filter bowl and in the bottom of the carburetor. It ...