Docsknotinn
Veteran Member
DFA- Diesel Fuel additive. This is essential in the new High pressure Diesels like the Duramax and the HO Cummings that run the fuel systems at 30,000 + PSI. Probably less critical on the tractor but water is a bad deal in any diesel fuel. FPPF is the brand and you should be able to do a net search for their web site. Also Primrose or Standyne. Most of theese have to be mail ordered and I still find them VERY cost effective. Most of the off the shelf stuff is achol or kerosine based or so I have been told by a couple of fuel experts.