Figure 4-6.Typical fuel filter locations.
increases, resulting in lower current flow through the
heater coil, thus producing less heat to bend the
Fuel filters stop contaminants (rust, water,
corrosion, and dirt) from entering the carburetor,
throttle body, injectors, injections pumps, and any other
parts that may be damaged by foreign matter. Fuel
filters can be located in the following locations (fig.
A fuel strainer is also located in the fuel tank on
the end of the pickup tube.
In the fuel line right after the electric fuel pump.
Under the fuel line fitting in the carburetor.
Inside the fuel pump.
In the fuel line before the carburetor or fuel
When in doubt about the location of the fuel filter,
refer to the service manual.
Fuel filters operate by passing the fuel through a
porous filtering medium (fig. 4-7). The openings in the
porous material are very small, and, therefore, any
particles in the fuel that are large enough to cause
problems are blocked. In addition to the filtering
medium, the filter, in some cases, also serves as a
sediment bowl. The fuel, as it passes through the filter,
spends enough time in the sediment bowl to allow large
particles and water to settle out of it.
Several types of fuel filters are used today. They are
the replaceable in-line, the replaceable in-line in the
Figure 4-7.Fuel filter operation.