I like the bulb before the separator because priming is easier with a new empty filter. The boat building coast guard spec is running below deck fuel line from a permanantly mounted fuel tank to the fuel water sep assy then using regular fuel line and primer bulb after that. If your put the bulb before the sep assy they recommend the new Yamaha f-350 approved bulb that retails for @ $80.00. This may seem like use-less knowledge but I am pretty sure this is the spec. Last I like the BRP primer bulbs for best bang for your buck.
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1975 V-20 w/1996 225 Johnson
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