Day / header tank versus polishing system

[Jim Cate]

Originally Posted by noelex 77

Yes, as you correctly point out the return has to go to the day tank. However, as Rslifkin points out the overflow from the day tank should lead to the main tanks. This prevents fuel spill if you transfer too much fuel from the main tanks and it also allows the worthwhile option of running direct from the main tank without any overflow issues. In this case it functions as a return to the main tanks, which is what I was referring too.

OK, I agree that any overflow should be directed to the main tank... and that there should be the possibility of running from the main tank if something goes wrong with the day tank delivery.

I'd like to have such a system, but retrofitting is challenging to say the least!

Jim

[noelex 77]

Originally Posted by rbk

The engine will generally provide a similar amount of fuel polishing as a small DIY polishing system.

This is often posted, but is not true. The volume of fuel filtered is vastly different.

Take a look at these two filters. They are the same age, same micron rating and changed at the same time. One is the main primary engine filter and one is from the polishing system. The primary engine filter looked indistinguishable from new. The polishing filter has filtered out significantly more debris.

This is for very clean fuel (hence the spotless primary engine filter), but illustrates how the polishing system filters a much greater volume of fuel (and picks this up from the bottom of the tank) hence does a very different job to the primary engine filter.