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Oh, and a little trick that I watched MarkMontana perform in the middle of Wyoming on a 923 to get it started when the primer pump was inoperative: Disconnect the line to the primer pump and backfill it with a small funnel and some fuel.

Hi SteelHound, My M923 (and the other M939's that I've checked out) has a single line running from the IP to the primer pump, followed by a drain valve. The drain valve is missing on my truck, but all other trucks I've seen have one (looks to be the same as the air tank drain valves)...

I just recovered my first 939 series truck, an M923A1, and while it started with just a couple cranks at the GL lot, it ran really rough and occasionally made a disturbing knocking noise at idle. During the 1000 mile drive home, it ran fairly well, but idled like crap, and at each startup it...