Fuel Injector Cleaner is a popular topic amongst aircraft owners, but finding safe and FAA-approved options can be challenging. While there aren’t any specifically FAA-approved products for on-engine fuel injector cleaning, there are approaches to address clogged injectors and maintain fuel system health.
Understanding Fuel Injector Issues in Aircraft
Often, 100LL avgas itself acts as a sufficient solvent, dissolving many contaminants and deposits. Its potent solvency is evident in its ability to dissolve the blue dye added to it. However, certain types of contamination, particularly lead deposits, may require more aggressive treatment. For lead deposits, a tricresyl phosphate (TCP) additive might improve lead scavenging and prevent future buildup, though it might not clear a fully clogged injector. It’s worth noting that TCP is a harsh chemical, and aggressively leaning your engine mixture can sometimes achieve similar results without the associated risks.
FAA Guidance on Fuel Additives
While no specific fuel injector cleaners are FAA-approved for on-engine use, Advisory Circular 20-24D offers some guidance. This document, primarily focused on fuel specifications for aircraft certification, indicates that additives meeting specific criteria are acceptable. Additives incorporated into ASTM, governmental, military, or industry consensus specifications (like ASTM D910 for 100LL avgas) are generally considered acceptable under existing operating limitations, provided they adhere to specified concentrations and don’t contradict manufacturer guidelines for the engine, airframe, or components.
Professional Cleaning: The Safest Approach
Despite the potential for using approved additives, navigating the regulatory complexities and potential risks associated with incorrect usage can be daunting. Some additives can damage the fuel system or even cause engine failure.
For most aircraft owners, the safest and most effective solution for clogged fuel injectors is a professional bench cleaning. This process involves removing the injectors and cleaning them thoroughly in a controlled environment. This procedure isn’t overly complex; a competent aircraft mechanic should be able to perform it without difficulty or risk of damage.
Choosing the Right Path for Your Aircraft
Ultimately, maintaining clean fuel injectors is vital for optimal engine performance and safety. While 100LL avgas often suffices, more stubborn deposits may necessitate further action. While approved additives exist, their use requires careful consideration and adherence to regulations. For most, the safest and most reliable solution remains professional bench cleaning by a qualified aircraft mechanic. This proactive approach minimizes risks and ensures the long-term health of your aircraft’s fuel system.
