I have searched high and low but cannot find any fuel filters, not even a water separator. I followed the fuel line from the tank and it goes directly to the low pressure pump. From there a short hose connects it to the high pressure pump. One line from high pressure pump then goes through a water cooler and then out to the rail. There is one other fuel line between the rail and the high pressure pump directly - I'm guessing this is a return line, but not sure. The inlets to the pumps don't look like they have any filters and I don't see anything inline. Where do I look?
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