Fuel leak

The vented cap is the overflow. It isn't unusual to have fuel run out the wing cap vent if the tanks are full and you park with the wings not level. Maybe the Forney with 15 gallon tanks is different, but my 415-c model with traditional tanks has no overflow. Most don't top off the tanks to avoid fuel running out of the caps. If you have fuel coming out anywhere else, then you should be concerned. Is it possible the fuel is coming out of the vented caps, then it runs to the the underside of the wing and because of dihedral, down the wing into the fuselage? If that is the case, then the solution would seem to be don't top off the tanks.

Take off the wing to body fairings. If you have any seepage or leaking you will have a blue or red stain depending on if you use avgas or mogas.

If you have 36 gallons on board you could fly for over 6 hours. My bladder could never handle that without a catheter.

If you have a leak at a rivet. Drill it out and replace it with a Cherrymax (aircraft grade pop rivet) dipped in BMS 5-95 P/S 870 B-1/2 sealant

Confused now? Matt said it is okay to have fuel drain thru the holes in fuselage if aircraft is full tanks and not level . I understand that you are saying that I should have no fuel in the fuselage therefore it must drain somewhere else? Am I to be concerned or not? Thanks, Ken

As Matt said, there are drain holes along the bottom of the fuselage for rain water, one at each frame I think maybe. If you have anything else draining out of those holes, like fuel, then you have fuel sloshing around under your feet and seat where it is not supposed to be.

the tanks are interconnected, if the plane is not level, the fuel is going to flow into the lower tank. The places it drains out of the fuselage are the drain holes for water, nothing to worry about,

I am a new club member and a new owner of an Aircoupe Forney F-1. My airplane has had the header tank removed and now has two 15 gallon wing tanks. My hanger entry has a slight slope and after I top off the fuel tanks (no significant  temperature changes) and push it up the slope a a significant amount of fuel runs out of small holes in the lower bottom of the fuselage and even out of the closed fuel cap of the left wing tank.I am in the middle of my annual inspection and my mechanic and I are trying to solve the problem. So for no leaks found in fuel lines. I am wondering where the fuel overflow valve is in this configuration. The cap vents seem open. Any help would be greatly appreciated! Thanks, Ken Boatright