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In this Zenith Super Duty build video, we are installing the fuel line from Aircraft Specialty Flightlines.
Complete Fuel Line Kit: aircraftspecial...
Additional Info:
Two questions often come up regarding my fuel line installation. First, what is the lifespan of the hose, and second, why do I use a sealant on the threads.
Let's first talk about the life of the hoses. All hoses from Aircraft Specialty are conductive Teflon PTFE. PTFE is just a fancy technical name for Teflon. Notice I said "conductive" Teflon and not just Teflon. There is a big difference. I've heard many people say "I can build my own hoses from Summit Racing for a lot less money." True you can, but lets' look at WHY it's cheaper. The hoses you will get from Summit may be Teflon, but not conductive Teflon. The flow of fluid in the hoses causes static to build up. Eventually that static can "punch" tiny hoes in your hoses and make them weep. (Google it for a better explanation).
The conductive Teflon hoses from Aircraft Specialty have carbon in the Teflon and that grounds the hose from end to end and prevents that static build up. Yes you can purchase high quality conductive Teflon hoses and make your own, but the cost is equal to what you will pay for a pre-assembled and pressure tested hose from a company like Aircraft Specialty.
So when you look at the life of a standard Teflon hose, it is recommended you change them every 10 years because that static electricity build up can damage the hose over time. The conductive Teflon hoses have an indefinite life. AS still recommends changing your firewall forward hoses when you have your engine rebuilt. The hoses from the wing to the firewall can remain installed for the life of the airplane. If it takes you 30 years to reach TBO on your engine, your FWF hoses will be just fine.
Thread sealant. Note that if you are installing an NPT fitting, it is required to use a sealant. On a hose with a flared end, it is not recommended to use sealant. Then why do I use it? You have to understand WHY it's not recommended. Using sealant will not hurt anything, but you have to be very careful not to get any on the flare or IN the hose. That can travel to your carb or fuel injection system and cause issues. I like the sealant because when putting steel hoses on aluminum fittings, I feel it helps "lube" the threads and prevents galling of the threads. I very carefully apply the sealant and leave the first two or three threads clean with no sealant. Doing it this way makes it impossible to get sealant where I don't want it. Remember, YOU are the manufacture of YOUR aircraft. You have the final say in your own construction methods.
Aircraft Specialty Flightlines: www.asflightlin...
NOTE: The firewall gascolator mount DOES come with the fuel line kit. (the gascolator comes with the Zenith kit).
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