Fuel Filters

A fuel filter removes rust, dirt and water from fuel before it reaches the injectors, protecting the injection system from contamination and wear.

What it does

Fuel passes through a fine filter medium that traps particles. Diesel filters usually add a water separator, because water in a diesel injection system causes rapid damage.

Signs a fuel filter is failing

Loss of power under load or on a climb
Hesitation or surging at steady speed
Difficult starting or extended cranking
Stalling that clears after the vehicle stands

When to replace them

Typically every second service on petrol, and more frequently on diesel where water separation matters. Always replace alongside a fuel pump.

What to confirm before ordering

Have these ready and the counter can usually confirm the part in under a minute.

Petrol or diesel, since the filters are not interchangeable
Whether the filter is inline or in-tank
Whether a water sensor is integrated into the housing
Correct sealing washers, which should not be reused

Fuel Filters by vehicle

Pick your vehicle for the years and engines covered, and what is specific to that application.

Fuel Filters questions

What happens if the fuel filter is never changed?

It gradually restricts flow, which starves the engine under load and forces the fuel pump to work harder against the restriction. The pump usually fails before the driver notices the filter.

Why do diesel fuel filters need draining?

Diesel filters separate water from the fuel and collect it in a bowl. If it is not drained, water passes through to the injection system, where it causes corrosion and rapid wear.