f

full assist

Glossary “full assist” Definition:
Term used with variable assist steering systems to signify normal power system operation without restrictions. Requires little driver effort.

fuel tank vapor valve

Glossary “fuel tank vapor valve” Definition:
Valve mounted in the top of the fuel tank that vents excess vapor and pressure from the fuel tank into the evaporative emissions control system.

fuel trim

Glossary “fuel trim” Definition:
PCM function that adjusts fuel delivery during closed-loop operation to bring the A/F ratio as close to stoichiometric as possible.

fuel system

Glossary “fuel system” Definition:
Delivers fuel to the cylinders, consisting of a fuel tank and lines, gauge, fuel pump, carburetor or injectors, and intake manifold or fuel rail.