Can I leave B-12 in fuel tank while in storage February 26, 2014 Solutions Central › Category: Choke › Can I leave B-12 in fuel tank while in storage 0 Vote Up Vote Down juan ramone asked 11 years ago Can I leave B-12 in fuel tank while in storage? 1 Answers 0 Vote Up Vote Down chemtooler Staff answered 11 years ago Yes, you can—Berryman B-12 Chemtool Carburetor, Choke & Throttle Body Cleaners are compatible with all plastic and metal gas tanks. Please login or Register to submit your answer Username or Email Address Password Remember Me