|Mr. Funnel AF8CB Fuel Filter|
Portable fuel filters remove water, dirt, and other debris from the gas, thereby protecting the engine from harm. Why would you need to use a portable fuel filter? In a bug-out situation you may be filling up using gas stored in five-gallon cans (or other storage tanks), which may well have developed some water issues due to condensation build-up inside your gas can (any air space inside your gas storage can allow condensation, even if you are using additives such Sta-Bil). You may also be filling up at unfamiliar gas stations that you simply don't know the quality of the fuel. Or, particularly in a slow collapse scenario, the quality of available gasoline may become "spotty" even with brands/stations that you are familiar with, as the infrastructure slowly deteriorates.
Smaller fuel filters, with slower flow rates (1 or 2 gallons per minute) are less expensive and work best for smaller quantities, such as filtering the gas going into a lawn mower or small tractor. The larger filters with higher flow rates are more expensive but work better for fueling a vehicle with a large gas tank. For example, my Nissan Pathfinder has an 18 gallon tank. A small filter with a 2.5 gallon flow rate would take more than seven minutes for a fill-up. However, a larger filter with a 15 gallon flow rate would only take a little over a minute.
Note: Don't cross contaminate. Use a separate portable fuel filter for each type of fuel. In other words, have separate filters for regular gasoline, diesel, and propane.