How steep was the hill? The design of the early 140 gas tank is less than stellar and on my 1971 fuel injection tank the fuel pick up is not in the lowest part of the tank. The last 3 - 4 liters of fuel is never recoverable and on rough roads my fuel pump will suck air if the tank level is running near the bottom. If your fuel level was running towards the bottom 1/4 of the tank and you were heading up on a reasonably steep hill the pump might have been sucking air.
I think the later 140 with the forward mounted tank did not suffer from this problem.
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