Systems & Propulsion

Practical Sailor evaluated stainless-steel hose clamps from 11 manufacturers, including Shields, ABA, Murray, AWAB, Breeze, American Valve, Ideal/Tridon, Trident, Koehler, and Norton. The test clamps, both T-bolt and worm-drive designs, were all size 28 (for hose sizes 1 5/16 to 2 1/4 inches) and 32 (for hoses 1 1/2 to 2 1/4 inches). Bench tests included torque to compression and torque to failure tests, and a magnet test and long-term saltwater bath test to determine corrosion resistance. All clamps were closely examined for quality of construction and workmanship, and price was considered in final ratings.

Every day, as the temperature rises and falls, gases inside your fuel tank expand and contract. The emissions released during this diurnal breathing have raised concerns at the U.S. Environmental Protection Agency, and in July 2011, the agency mandated passive carbon canister filters on all installed gasoline-tank vent lines to collect fuel evaporation emissions. While older boats are not required to retrofit, we wondered how such a filter would affect fuel quality and engine performance-and whether carbon is the most effective filter media-so we launched tests using E10, gasoline, and diesel to find out.

Regulatory Information:EPA Marine Evaporative Emission Regulations (40 CFR Part 1060) EPA diurnal emissions testing protocol EPA baseline evaporative emission estimatesEPA memo...

As I plumb the archives for holding tank replacement info, I find excellent related articles (PS, February 2012, March 2012, and April 2012); all remind me to build in good ventilation. However, I am unable to find guidance on the merits of ventilation fittings. These stand at the interface of tank gasses and other contents trying to get out, and the marine environment trying to get in. Issues such as shape, location, mounting, and materials concern me. Can you bring some fresh air to vent fitting merits?

Well, the first year without subsidizing U.S. refiners and farmers for using corn to make ethanol-blended gasoline has passed, and the world didnt end. Gas prices havent soared, growing corn is still profitable, and most of the members of Congress who reversed their political stands are still in office. Im pretty certain that when historians and economists look back on the 30-year-old, $20-billion tax break for turning corn into fuel, it will be seen for what it is: failed politics masquerading as clean energy policy.

In the August 2012 issue, Practical Sailor reported on the effectiveness of eight common fuel additives in reducing salt-induced galvanic corrosion in E-10 fuel systems. Some makers suggested our test was too tough and too short, so we have repeated the test, for five products, reducing the amount of seawater from 0.03 percent to 0.015 percent (equivalent to four drops of water in a 1-quart tank) and increasing the exposure time to two months. Included…

The AC pump passed inspection, but it never turned on again. Then there was the leaking diesel fuel. The previous owner had added see-through, 30-micron filters where the fuel exited the tank because the metal ones at the engine are hard to reach and inspect. I have since learned that this type of filter is sure to leak, as diesel will soften the plastic housing. I am told that the Coast Guard will hammer you if they find them installed.

The AC pump passed inspection, but it never turned on again. Then there was the leaking diesel fuel. The previous owner had added see-through, 30-micron filters where the fuel exited the tank because the metal ones at the engine are hard to reach and inspect. I have since learned that this type of filter is sure to leak, as diesel will soften the plastic housing. I am told that the Coast Guard will hammer you if they find them installed.

Practical Sailor’s original goal with this evaluation was to run a long-term test of fuel additives. Instead of adding heat or oxygen or excessive corrosive materials, we would substitute time. After six months of testing additives in E-10 gasoline, we found no measurable corrosion, so we elected to add a small amount of seawater and compare fuel samples after one month. The results were surprising to even our testers. The additives we tested were: Hammonds’ Biobor Ethanol Buster, CRC’s Phase Guard 4, Mercury Marine’s Quickstor, PRI-G, Sea Foam Engine Treatment, Sta-bil Ethanol, Star Tron Ethanol, and ValvTect Ethanol.

If you really must know how we compared the fuel additives, here are the particulars.