Most of the fuel additives we tested were concentrates that came in bottles designed to allow pre-measuring. In most cases, just a few ounces could treat a full fuel tank.

Additives vs. Gum, Sludge

PS tests seek out best overall gasoline and diesel additives.

If we used our boats like the family car, back and forth to work each day, fuel would never sit for more than a few weeks and it would never age. Instead, boats sit for weeks at a time in-season, and for months during the off-season. Water, oxygen, bacteria, metal ions, and even instabilities in the molecules themselves combine to turn fresh fuel into a soup that will clog filters, corrode fuel systems, and leave us stranded. Fuel refineries have long known this, and all products are dosed with inhibitors at the refinery; however, these dosages are calculated for the normal distribution and storage times, not half-full tanks that will sit for months or even years.

Continue Reading

More Outboards

DIY Engine Oil Tests

 Subscribers OnlySailors obsess over the health of their engine; it is the heart of the boat (other than the rig, sails, and...

Coolants that Fight Corrosion

Salt and water conspire to reduce our boats, our pride and joys, to pitted and unreliable money pits. We’ve...

Step-by-step Winterizing Tips

Winterizing agents should never be used in freshwater tanks or hot-water tanks. Doing so will greatly increase the...