I'm a Racor filter user here although I picked up a different type filter maker this last time but it will do. Not sure if theres a difference but before I open the lid I drain the fuel out of the bowl, relieves some pressure I found and add a nice fill of Diesel Kleen and button it up, start, check for leaks with your finger around the lid-bowl mating surface and go. I recheck again the next day or later in the evening just to be sure.

 

For what its worth, My budies big truck shop fills there filter with trans fuild. They say it cleans the injectors as it runs threw. They let it idle and rev a couple times before driving so it fills back with fuel.

 

Thats old school treatments back about 20-30 years ago, I heard about it all the time, shucks, I poured a quart from time to time in each 100-150 tanks and off I went, no problems. With todays components and fradgile o-rings and our delicate injectors, I'm extreemly hesitant to go doing it to mine. I'll use Diesel Kleen or Howes..

 

We used to use that as a top end cleaner on gassers when I was a technician. Does a good job in cleaning off carbon.