If it's not from the tank then I agree with x-bird about the cracked or leaking intake--or a loose electrical connection (start with the coil)
Doubt the bouncing is causing the carb issue- FYI-I built and owned 3 older Jimmy/Blazers (1 ton's on 48's) and never had a problem with the carb getting dry due to bouncing (it woud get loaded up sometimes at extreme angles) and they were all running off an engine mechanical pump.
What is "a little priming" that you keep talking about?
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