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You want to release the ether into the engine while it is cranking over.

As I said, the only time ether is released into the engine intake is after you release the button. In your post, you do not mention releasing the button.

How are you operating it? I’m not familiar with FMTVs but assuming they use the same system as most diesels you need to hold the button, let it “load” then it releases the measured shot of ether when you release the button.