The Transformers seem to drink energon, whether it be through their mouths or guzzling it through their face plates. So how does Shockwave drink one? He has no real discernable face.
He opens his eye and that's why he's called Popeye.
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Early in the U.S. comic run, there are several occasions of a Transformer removing their hand in order to pour out fuel, so it makes sense that they could also ingest fuel through a wrist-located port.
Also, in "The Smelting Pool" (or one of the comics immediately surrounding it) the Autobots have to bribe an "Empty" with fuel, and he drinks it through a fuel port in his chest plate.
So there are two more theories, both of which would work for Shockwave.