Thanks for your interest in Berryman. Most of our fuel additives, thru-rail, and “soak” products are intentionally formulated with strong solvents capable of slightly swelling o-rings and other rubber or plastic parts, we do have a few options we can offer.
The most direct replacement for a soak type product is Berryman B-12 Chemtool Thru Rail Injector Cleaner (part #1126).
However, you might instead consider our strongest fuel additives—both of which contain fuel stabilizer also which is optimal for vehicles and equipment that’s stored for more than about 4-6 weeks. These two in-tank additives are B-12 Chemtool Total Fuel System Cleanup (part 2616) and B-60 High-Mileage Fuel System Rejuvenator (part #7516).
Both additives should address the matter.
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