Fuel shut-off valve

[zoomin]

I have acquired a set of 1962 Harley Panhead gas tanks. It seems I need to chase and clean up the threads for the “Instant Reserve” fuel valve seat where it threads into the bottom of the left tank. Does anybody know what size the threads are in this hole in the tank and where I might find that size tap or better yet that size thread chaser?

[panz4ever]

It is 3/4-18. if your hardware store doesn't have it, McMaster Carr does.#2595A362. $44.03

[ManPan]

You should also check the spacing between top threads and bottom threads..Maybe someone you know would have the tool to set the space..think they still sell them. good luck...