Something we have long noticed at PS is that gasoline and diesel control samples in our aging and corrosion studies never really age much. Only when the samples include metal samples do they generate gum and discolor. One explanation is refinery stability treatments, but the primary difference is that copper and zinc ions are powerful catalysts for polymerization. Shore-side fuel storage systems do not experience this type of break down because copper tubing, brass fittings and galvanized pipe are forbidden by code . The following requirements are quoted from standards groups and OEMs.
What about fuel bladders? Fuel bladders must meet a higher standard than water bladders, but many of the findings from our water bladder test apply to fuel as well (see Practical Sailor Drops, Drags, and Dissects Three Flexible Portable Water Tanks, PS October 2007).
Ever since we adopted improved fuel management methods, weve enjoyed a decade of no carburetor maintenance-not on the twin 9.9 hp engines that ran our catamaran, not on the dinghy kicker, and not on our trimaran. Not on any of our chainsaw or blower motors. Given the quarterly ritual wed enjoyed before, its been wonderful.
This year, President Trump rescinded the summer ban on E15 sales. Previously, E15 could not be sold between June 15th and September 1st because the extra ethanol increased vapor pressure and increased smog formation. As of this writing, distribution of E15 is limited outside of corn belt areas, and negotiations continue between the EPA, which opposes higher ethanol blend levels, and the agribusiness lobby.
The leading cause of death of metal tanks, on land and at sea, is corrosion. Industry standards for fuel tank farms require internal inspections starting at 15 years, and as a licensed API tank inspector, our Tech Editor Drew Frye knows well why these interior inspections are required.
Different filter manufacturers can chose different rating systems that rely on different statistical values for filtration. The higher the percentage at a given rating, the more effective. Interestingly, the effective rating changes over time, as particles clog up the media, making the holes smaller.