Gas filler neck to gas tank seal

I believe you are correct in the way you are describing how to install. The biggest issue I had was not the installation of the seal but the filler neck. I used a little, very little of 30wt oil to coat the inside of the seal so I could slide the filler neck back into the seal. After numerous attempts to get it to go in and none successful (with it dry). I finally got on here and asked if it was me or had anyone else have the same issue. That was the hardest part of all. If you try to insert it dry it goes about 1/2" to 3/4" in the seal and stops. Then the filler neck is sticking out of your fender and you can't figure out why? Hope this helps
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