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Careful with bio, it is highly corrosive and the early Cummins junk didn't like it, BUT, since it is corrosive, it might help! I agree, looks like water or something water based. There are other fuel system cleaners out there, I just have never seen them work, so if the FG part can't be located...

Man, that is NASTY!! I am kinda fighting this kind of issue on a deuce, been sitting for +13 years. The shut off was stuck hard. the HH arm kept wanting to spring back to the no fuel position. I have let it run and get some heat in it and it is better. I moved it the other day and upon clutch...

https://cumminsfiltration.com/sites/default/files/MB10106.pdf Any Cummins dealer, Frtlnr, Peterbilt, KW, etc. should be able to find it. It is a Cummins Filtration product, not a Cummins part. Another thing I thought about, the idle stop adjuster has a tendency to wear if the engine has been...

Yiu said the fuel system was full of "tar". Cummins makes a cleaner that works wonders, I have seen it work on the dyno. The 1 gallon p/n is CC36096. You will need to make up lines to pull from and return to the can it comes in. Give this stuff a try before you go into the process of having the...