On my 88 coach I was informed that the when using the preheat switch it heats the fuel so it enters the engine hot for easy ignition. Probably just another of many different systems that have been used by Newell over the years.
On my 78 Newell with the 555 cumins engine it had a built in either container and the engine would not start without giving it a shot of either prior to starting. This was installed by Newell when the coach was built.
Wally
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