Reply to "Fuel filter change"

George PAdmin.

Most fuel pump manufacturers recommend both a pre-filter (inlet) and a post-filter (discharge).

The pre-filter is normally larger, and filters in the 75 to 150 micron range. This keeps fuel tank "garbage" from causing pre-mature failure of the fuel pump while also avoiding limitation of fuel flow into the pump.

The post-filter can be smaller, and normally filters in the 10 to 40 micron range. This keeps all the fine stuff that passes through the pre-filter and fuel pump from reaching the carburetor or fuel injectors.

-G

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