(How It) Works Wednesday: Fuel Filters

My poor Buick has been experiencing a loss in engine power for some time now.

In searching for answers, I heard terms related to vehicles I’d never really understood, so I decided to do a little research into the workings of a car. The mechanical magic of these mysterious metal marvels continues to amaze me. I take the action of a vehicle for granted in part due to the simplicity of the driver interface: gas pedal means go, brake pedal means stop, steering wheel turns right and left. But the intricacy and complexity of the supporting design that enables me to operate that vehicle safely merits further investigation.

The specific piece of technology I focused on for 
today is the fuel filter. 

The need for a fuel filter

The system delivering gasoline fuel to the engine block demands some sophisticated components. Old carbureted engines would utilize negative pressure to supply gasoline into the engine; in other words, sucking it in like a vacuum. Modern fuel injection engines utilize positive pressure with electronic pumps, forcing the fuel through the system instead.

The process of filling a tank with fuel often introduces foreign particles, such as dirt or paint chips. Due to the immense force involved in an internal combustion engine, these particles can cause rapid wear to engine components through abrasive action. A fuel filter prevents contaminants from entering the engine block, extending the life of the engine. It also improves engine performance, as the fewer contaminants are present the more efficiently the fuel can be burnt.

Components of a fuel filter

Fuel filters consist of a pleated material, usually made of fiberglass, cotton or other similarly porous substances, encased in metal or plastic. Fuel enters the casing and is forced through the pleats into a porous metal cylinder, from which it passes into the fuel lines leading to the engine. Any foreign contaminants are left behind on the material, leaving the clean fuel to be supplied to the engine block.

Don’t be like me and change your fuel filters

Mechanics recommend changing fuel filters at least once a year, otherwise they end up looking like this:

So far as I know, mine hasn’t been done in five.

Uh.

Probably time.