I've used K-100 fuel treatment with great results...Both for fuel system cleaning and long term storage. They make formulas for both gasoline and diesel.

Regards,
Paul

1970 Barracuda Convertible
1970 Newport Convertible
1970 Satellite Convertible
1974 'Cuda shell - '71 conversion
1988 Oldsmobile Cutlass w/455
2003 RAM3500 CTD
2007 Caliber R/T AWD
2007 Magnum SRT-8
2016 Chrysler Town & Country