Gentlemen –
I am working on a ’53 Mercury mark 7. All going well – until I tried to remove the fuel filter and related gaskets there. I got the large hex nut inside the upper cowl to move, but it seems to be held in place by a nut inside the gas tank – I can see that spinning freely when I look into the tank with a flashlight. Am I not understanding how this comes apart, or missing some special tool to remove and then replace this nut again?? Any advice much appreciated –