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the muiltifuels can be started/driven without an operable in-tank pump if its run at least once a month and keeps its prime.. The most common symptom aside of a silent fuel tank when you flip the accessory switch, is a prolonged cranking time / hard start ..I drove it for 4 months without a fuel pump. Lucky? Maybe.
... Just crazy how all of a sudden this thing stops. You mentioned fuel plunger being in correct position.. How would it not be?
yes it's crazy how sudden the failure happens.. I shut off a "perfectly-running for years" M109A3 one december day and come April when I went to wake it up from its winter nap it would not fire.. Had fuel to the IP, but nothing at injectors .. In my case it was the dreaded plunger button that decided to fall off.. Happened to the M62A2 once and also to a forest service M49A2C that I obtained at reasonable cost because their mechanic and potential bidders thought the IP was toast and expensive fix.. I had the truck running within an hour of getting it here and it's a strong sweet truck with its 1990s "brand new" driveline
Although I have pulled whole pumps on several diesels and rebuilt some, I have never needed to pull an entire multifuel IP, thus cannot help you much specifically to timing it to the marks.. wish i could .. However, what I do know is if you have pressure or fuel at the inlet and find there is nothing on the hi side, I suspect your plunger button fell off. Doesn't take much, by chance did you drop or otherwise jar the IP when you had it out, even if it fell only a few inches? IMO the little clip that holds the button is the Achilles of the entire IP
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