The Plasti-mend kit is used on the outside of the tank (as stated by Chuckster). If the only leak is, as you say, "A tiny pin hole" and you have identified the pin hole and have access to it. You might find that using a soldering pencil or a wood burning tool and simply "smoothing over the pin hole (much like plastic welding) would be much simpler, cheaper and less "involved".
Just a thought, maybe your description of a "pin hole" is different than mine, but I wanted to at least make the suggestion.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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