Well... to put a 400/485 pump in....
When performing the return conversion that is included with the S2 fuel system, you will have to do some "light" hacking to get the stock regulator out. It is "molded" in there.
Once the return conversion is installed to the sending unit, the port off the internal filter that used to feed the stock regulator gets blocked off with an o-ring. Once this has been done, the hacking involved to put the 485 in there will require chopping into the filter. This means you will have to just bypass the filter, and install a filter outside the tank somewhere. Adding an external filter to the S2 fuel system is done pretty easy. There is a short pipe in the rear of the kit that I made so that it can be removed and replaced with a filter and some additional plumbing when needed.
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