fuel filter before or after or both on electric fuel pump team.
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pre and post pump fuel filter considerations.
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can you put a filter before a mechanical fuel pump.
15 05 2009 you want a 100 micron filter prior to the pump and a 40 micron minimum before the regulator if going to a finer pre pump filter it has to have a higher flow rating the big canister ones are don t think you need a pre pump filter go look inside a gas can that s been in use for a while say 1 2 hundred gallons put through it.

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an external electric uses a medium 100 micron or so filter to protect the pump and a fine 10 to 40 micron filter to protect the tiny nozzles on the fuel injectors carbs with an electric pump also require the pump to be mounted near the tank with gravity feed and a filter to protect the pump all electrics work best this way but the filter requirements after the pump are not as stringent.
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11 09 2011 most fuel pump companies reccomend a fuel filter after the pump so the fuel pump always has fuel i asked about debris in the pump the said it was not a problem i usually run 2 filters one before the pump and one before the carb and then the filter in the carb if it is a holley or q jet h.

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fuelab also recommends the filter rating be between 75 and 150 microns for the pre pump filter when using their fuel pumps while it may be tempting to use a finer lower micron rating filter upstream from the fuel pump it can lead to pump failure.
fuel filter before electric pump




