I second the Biobor JF ! It's got to be good if it's Biobor Jean-Francois (JF) Lol
All kidding aside, I've used it religiously and my fuel looks like green-ish maple syrup. Nice and clear. Not only in the Racor but It's been checked by shining a flashlight in the fuel tank inspection port, clear as can be. It's super concentrated, one bottle is good for more than a lifetime for me (2,600 gallons) https://www.amazon.com/Biobor-JF-Diesel-Fuel-Biocide/dp/B007ILFKS6/ref=sr_1_1?dchild=1&gclid=CjwKCAjwxaXtBRBbEiwAPqPxcJxCexe4-UiH7SDdx4ADjD-D2QWAEs0oVKwffq6jCcAATv_OF_u76xoCHh8QAvD_BwE&hvadid=241631335410&hvdev=c&hvlocphy=9010777&hvnetw=g&hvpos=1t1&hvqmt=e&hvrand=7195482034710645276&hvtargid=aud-647846986441%3Akwd-6946444787&hydadcr=26614_9892224&keywords=biobor+jf&qid=1571428140&sr=8-1 Great stuff! Jean-Francois Rivard 1990 34+ "Take Five" Lake Lanier, GA ***** USE BIOBOR JF ! ***** Sorry to yell, but this is important. ***** I learned this habit on a trip to FLA in 2000, and have never had any more black gunk or any problems. ***** Bill Coleman ***** Erie PA
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