A 40 micron pre pump will put some stress on the pump. But your going to run a double pumper right. Wonder what the micron size is on the walbro pump filter. Whats the total flow on the filter you got from thwm? The filter I have flows 300gph. As for flushing the system, the ptfe is pretty stought line I dont see anyone having issues unless your trying to put 500,000+ Miles on the car
No, it won't, provided the filter will flow enough. It is all about total flow of the filter, not the micron size, necessarily. Again, I don't work there, but you can call Justin@Kinsler and he could explain it to you better than I ever will.
They work with Sprint/Methanol cars all the time, so I trust their judgement when it comes to these things. Plus they can flow pumps/injectors/etc. so I got an actual flow sheet of my pump (It was from Weldon, but Kinsler can still flow it if you so desire... mine flows 22gph more than what its rated, too
talk about customer service!!!!)
The filter I have is their Monster Mesh, I believe. I forget the gph, but the total surface area is far superior then what I have seen elsewhere. If you look on their site, or call them, they could let you know. All I know is they wanted me to have as minimal restriction as possible, so the filter I got would cause little-to-no (of course there will always be *some* restriction) hindrance of flow for the fuel. its about 5x7 externally, I believe.