[Malcolm]

The exploso safe filler to the fuel tanks make them very slow to fill. You are not alone with this issue. A breather from the rear of the tank to the filler cap can reduce the problem. I did know of someone who once a year took his sill panels off, drained his tanks and then disconnected the fuel filler pipe. He then used the super high tech approach of a broom handle up the tank to push the exploso safe foam back so that it stopped restricting fuel entry flow. I have not tried this myself but it was a solution used by someone some time back.

There is no owners hand book.