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Stay InspiredEAA is your guide to getting the most out of the world of flight and giving your passion room to grow.
Got the Blues? (As in Stains on Your Floor?)
By Ralph Inkster, EAA 448193
June 2020 – Replacing the seal in a gas tank drain is an easy five minute job, after draining your tank of course.
All you need is a small diameter drill bit, a sharp tool like a dental pick, and the proper replacement o-ring. After the tank is drained, press the valve open and insert the drill bit to hold it open. Then remove the old o-ring with the dental pick and replace with a new one.
Replacing the fuel drain valve o-ring.
Make sure you get the right o-ring size. The SAF-AIR CAV-170 has a small o-ring on the stem and another larger one on the base where it seats against the body of the fuel tank. According to SAF-AIR you'll need Viton Compound M83248/1- 06 or MS29513-06 for the smaller size and -12 for the larger o-ring. Both seem to be Viton (fuel resistant synthetic rubber) mil specs. The only one you'd need for a valve like the one is the picture is the -06. You can replace them both for less than $1 so it's good to have spares. Thanks for the tip about the dental pick Ralph, great idea. — Ed.