Ironically, I've had two fuel thermostats fail in the last 6 months. (separate cars).....I noticed the rebuild kits are about $52 bucks each and just wonder how important these units really are. I can guess that during the Summer, it really does not make a difference, and the only problem that I had was leakage.

Do I need the whole kit or just the oring seal?

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87 300SDL - 215K Miles !!
99 F-350CC Dually PSD - 190K
86 300SDL - 189K
All on B-100