This article / advertisement makes sense to me when your at the gas station pumping gas and your gas is pumping slower than normal the gas is contaminated or phase separated and it's clogged the gas pumps filters.
It's an older article.
The Solution
When dispensing fuels containing ethanol, proper filtration is the answer in the detection of phase separation. Special phase separation "alert" dispenser filters have been developed that will notify the operator of the condition by slowing fuel flow to less than 1 gallon per minute. This "slow flow" condition is a signal that water is present and that the tanks should be tested for phase separation.
These alert filters have a construction that features a non-toxic two-part chemical and "super absorbent polymers," or SAPs, designed to detect elevated levels of water as the fuel tries to pass through the filter. When this phase-separated fuel reaches the reactive chemicals, the SAPs expand and the filter generates a barrier that slows the flow and keeps the phase-separated fuel from passing.
In order to ensure that their water-detecting properties are used to their maximum capabilities, these phase-separation-sensing filters should generally be changed after six months in service, after dispensing 500,000 gallons of fuel, at any point when a reduction in flow rate is detected, or at any time the fuel-load composition is changed.
Handlers of fuels containing ethanol also have to remember that high concentrations of ethanol will scour tanks, hoses and other fueling components, resulting in a lot of contaminants being thrown at the filter. Because of this, filters should be changed more often when tanks are being converted from gasoline-only use to being used with fuels containing any level of ethanol. Before this conversion, it is also wise to dry out wholesale storage tanks and properly prepare retail storage tanks and dispensers for the new fuel.
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