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Re: Fuel filter location with External pump
Ideally you want one before and one after, but a lot of people don't run the pre-filter. You want about a 100 micron pre-filter before the pump and a regular high pressure filter after the pump. I have omitted the pre-filter in the past, but on the trucks I know I am going to be driving a lot, it's cheap insurance, since a small amount of crud can quickly ruin a fuel pump.
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