Draining fuel tank

Hey team! My 1972 280SE 4.5 has gone from totally reliable to shutting itself off after 10-15 miles. It restarts after a short rest and does the same thing again. I've replaced almost everything except trigger points but I thought I would drain the fuel tank first to make sure there isn't trash in the tank. There's a large hex drain plug in the bottom middle of the tank and I don't know if my model has an internal filter. Can someone tell me what size hex driver is needed to remove the plug... Draining fuel tank

Hey team! My 1972 280SE 4.5 has gone from totally reliable to shutting itself off after 10-15 miles. It restarts after a short rest and does the same thing again. I've replaced almost everything except trigger points but I thought I would drain the fuel tank first to make sure there isn't trash in the tank. There's a large hex drain plug in the bottom middle of the tank and I don't know if my model has an internal filter. Can someone tell me what size hex driver is needed to remove the plug...

Draining fuel tank

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