I had the same problem last year and it was caused by a partially blocked overflow line, which lead to a number of other improvements. IMHO it's best to replace it and not even consider trying to clean it out. I tried cleaning mine out without success...ended up replacing the header tank last year and two reconditioned wing tanks this year...works perfect thanks to Vernon Gregory and John Wright.
-------------- Original message -------------- From: Richard Todd <[EMAIL PROTECTED]> Hello all, after completing the Paint/Polish scheme on our Coupe, I took it for a test flight last Friday evening. The plane looked great and flew perfectly. My partner took it for a flight yesterday and advised that when he reduced power on final approach, fuel began to over-flow rapidly from the header tank. As he would add power to the throttle, the over-flow was reduced but not stopped. As you reduce throttle power, the over-flow increases a great deal. I attempted to take it for a test flight this morning to observe the over-flow issue myself. As I was taxiing, I noticed the header tank filling by watching the float indicator go higher than usual. It then began a pretty heavy over-flow to where fuel was running down the cowling. At that point I just chopped power to avoid a fire. Now as it sits in my hangar, the fuel float is back to where it should be. It's acting as though the fuel return back to the wing tanks has slowed. It appears that the fuel pump is sending fuel to the header tank faster than it's returning to the wing tanks. Does this sound like a partial clog in the header tanks return lines, or could something else be causing this issue? I did check the vents on all 3 fuel caps, and they are clear. Other than that. I'm at a loss. Any advice will be appreciated. Thanks, Richard
