Originally Posted by Waterwayguy
I like to think of these systems as enhanced fuel filtering as opposed to fuel polishing. A true polishing system will have enough pressure from the pump to stir up the tank as the fuel circulates. Any additional filtering will certainly help. Chuck
As you say the two process are different.
Professional fuel polishes use a powerful pump to stir up the tank and ideally move the pickup point around. It is used for a couple of hours as needed perhaps every few years.
Permanent fuel polishing systems typically use a smaller pump, but they are used frequently. Mine is on most days usually for a couple of hours. The lower pressure stirs up the tank less well, but sailing in rough conditions does that better than any pump. The permanent systems filter the fuel many more times because they are on for much longer. They also filter any new fuel or water
that gets introduced into the tank.
The actual diesel
filtration system used for both systems is very similar.
Overall I think a permanent system has a lot to recommend it and will be superior to a professional system only done occasionally.
Other steps are important ,such as checking the condition of any fuel before you put it into the tank, using a biocide and stopping water
If your tank is very dirty only draining and physically cleaning
it will probably work, but fuel polishing will prevent ( or at least greatly delay) it reaching this state.
There seems to have been an increase in the fuel problems I am noticing, over the last few years, and a permanent fuel polishing system is a great improvement that is often relatively cheap
and easy to install.