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I know I had an issue with one of those lines. I ended up keeping the fitting and put a new nut/ferrule on it, then put a piece of 1/4" brass rod in there to use as my plug. Its not ideal but it works and its what I had on hand at the time. Some of the fuel fittings on these trucks are near...

Napa has a big selection of these metric drain plugs that will fit the flame heater holes. My local napa had the following on the shelf: m20x1.5.... Part # 7041046, & 7041070 m18x1.5.... Part # 7041385