Originally Posted by RichH
Do NOT put an onboard recirculation polisher in/on the main fuel delivery system or its return line.
My fuel polishing system runs for several hours a day and I now have crystal clear fuel. The polishing system picks up from the bottom of the tank via its own pump, filter and line, but it returns via the diesel return line. I am curios why you consider this is a wrong ? I cannot see how it would create any problems.
The polishing system is only run when the main engine is off, if this makes a difference.