Began to work on fuel tanks, Installed the fitings into the LH wing tank and built up upper wing root skin and clecoed it to the ribs to find the top filler hole center drilled the filler hole to 3 inch and set up the bolt pattern for the filler cap. Installed the tank back into the LH wind and found it to be 3/4 inch short of the wing root skin measured the other tank it was 3/4" taller emailed rans no reply yet.