Fuel system leak

[John Johnson]

[Dale Vandever]

Dock,

Tip tank leaks frequently come from a dried out cork seal at the fuel quantity sender. A leaking hose connection at the tip tank would probably be the second most common source.

Dale

[Zach Grant L1011jock]

With all six tanks, the most likely issues are in order, pin holes or worse in the top of the tanks, aux and main, leaking/deteriorated flexible line/fittings in wing root and/or on the fuel tank vents. Leaking flexible line on the tip tank to wing, or leaking sending unit usually propogate stains at the wing tip or along the lower lap splice over the spar within about 3 feet of the wing tip. One other thing to check if in fact there is migration from the tip to the aux (throught he tip solenoid) would be to pull the cap on the aux and see if it runs over. For the tip to run all the way to the wing root would be a BIG leak out there, and should be very obvious by pulling the tank.
-Zach

[John Johnson]

Thanks, Dale and Zach - your comments give me some good info to start troubleshooting with. I appreciate it!