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I am looking to upgrade my fuel system in both the flow and filtration department. Does anybody know what level the stock system filters to (microns)? I plan on going to a regulated return with duel stock pumps one feeding each head, and some sort of aftermarket filter/water seperator. I was thinking of just ditching the stock filter alltogether. I also was wondering what I need to filter down to and if I need filters pre and post pump. How many gph does the filters need to flow? I want a system that I will not have to upgrade later when I add injectors and h2e. Any help would be appreciated. Thanks
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It filters down to 2 microns at the normal stock PSD fuel system flow rate. It's efficiency drops off as the flow rate increases from a regulated return system. I like your idea of two pumps in parallel but think you should still use the fuel bowl for them to send fuel to. That way you have a decent filter assembly between the pumps and heads that has a built in air bleed (if done properly) and will prevent any contamination from a disintigrating pump impeller from fouling your injectors.
My set-up is the complete ITP regulated return. I am adding a Dahl 100 as a pre-pump filter and a Red Holley fuel pump in between the Dahl and the main pump to act as a booster pump to ensure a positive flow with minimal cavitation exists with the stock pump. As my fuel needs increase with a set of injectors, I will then add a stock pump in parallel just like you mentioned. I may then have to increase the Dahl's flow rate too (two 100's in parallel also) but i will cross that bridge when i get there.