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SelTec® Fuel System Service A Part: SelTec® Fuel System Cleaner #1212 - treats 25 gallons of fuel Recommended Service Interval: every 6 months or 6,000 miles (fits well with a tire rotation) Benefits: removes water - cleans injectors - reduces emissions - improves fuel economy Directions: add to fuel tank - ensure tank is half full or better, then run tank empty before refueling
More technical info…
Is it necessary to clean fuel injectors? As long as we are burning a hydrocarbon fuel we will experience deposits as a byproduct. When we heat gas in the combustion process sulfuric acid is produced, which causes the heavy ends of the fuel to drop out and form deposits in injectors, fuel lines, combustion chamber, intake valves, and anywhere else that is exposed to the fuel or the combustion process. The heavy ends of the fuel are referred to as olefin drop out, also commonly known as varnish. This varnish is a sticky substance that can also form as a result of gasoline sitting unused over time. Fuel deposits can form in injectors making it important to clean them as a matter of regular maintenance of the fuel induction system.
Caution: This product may be used on any vehicle regardless of age or mileage. The only recommendation is that the tank is half full or better, this is to ensure that the product has more chance to do its job as a cleaner. If the tank is nearly empty then the product will be burned off too quickly. There is also a risk that if the tank is low on fuel (1/8 of a tank or less), the product may lower the octane enough to make it difficult starting. This condition is rare and can be easily avoided by adding fuel. There is no measurable change in octane when this product is added to 5 gallons of fuel or more.
More technical info…
Is it necessary to clean fuel injectors? As long as we are burning a hydrocarbon fuel we will experience deposits as a byproduct. When we heat gas in the combustion process sulfuric acid is produced, which causes the heavy ends of the fuel to drop out and form deposits in injectors, fuel lines, combustion chamber, intake valves, and anywhere else that is exposed to the fuel or the combustion process. The heavy ends of the fuel are referred to as olefin drop out, also commonly known as varnish. This varnish is a sticky substance that can also form as a result of gasoline sitting unused over time. Fuel deposits can form in injectors making it important to clean them as a matter of regular maintenance of the fuel induction system.
Is there any risk in cleaning injectors?
Engineers are aware of the impact fuel deposits in injectors have on engine performance, and have substantially improved their design over the years. New technology in fuel injectors such as the GM Multec, pintle-less, and Teflon coated injectors is improving all the time. Today's fuel injectors are very delicate in some cases and do not stand up to continuous exposure to harsh chemical cleaners. In fact, in another GM service bulletin (F&E - October 2002 Hot Tip Summary) the manufacturer states that when flushing fuel injectors... "some corrosive cleaners can attack injector coil windings". Again we come back to the need to use good quality additives. SelTec® fuel products are not corrosive and have no negative impact on injectors or any other fuel system components, yet they are highly effective at cleaning fuel deposits. We do not recommend flushing injectors, mainly because it is not necessary. It is advisable however, to use a safe fuel tank additive every second or third oil change (6,000 to 9,000 miles) or twice a year.