I've tested gasoline additives regarding phase separation: good fuel management and vent filters work, additives don't. I've tested gasoline additives for corrosion protection; many were very good, some incredible, some useless, and one even made things worse. I've tested the effect of vent filters on gasoline corrosion; they help.
I've tested diesel biocides; most work well. I've started a diesel fuel test for corrosion, with and without a silica gel vent filter. In 3 months we'll know something.
I've always been more interested in gasoline because my boat runs on gasoline; I've neglected diesel and a few friends have reported tanks corroded through, some from the inside, some from the outside. Time to set that straight. I will be starting starting a set of corrosion tests based upon ASTM procedures but with a few modifications developed during our gasoline testing experience.
- 1-liter jars 50% full with 10-inch x 1/8-inch vent lines to allow controlled breathing.
- A trace of seawater (0.02%). About 2 drops. The coupons will be elevated above the bottom and not in contact with any precipitated water.
- Vinegar. testing of separator samples and research suggest acetate and low pH are common. About 25% vinegar in water. pH about 4.
- The recommended dose of treatment.
- Ambient summer temperatures.
- Standard ASTM corrosion coupon packs, but arranged to allow galvanic couplings of key metals. Most probably brass/steel copper and steel/aluminum/brass. Serious corrosion is generally the result of galvanic action.
- Stabil Fuel Stibilizer
- Sea Foam
- Standyne Performance Formula
Added based upon comments, below and e-mail...
- Biobor JF. After all, Biobor EB was probably the best gasoline treatment.
- Star Tron.
- ValveTech Bioguard
- Fuel Right