On my CH18, the crankcase pressure pulse tube is connected on the left side of the engine, just behind the PTO near the oil filter. The square (older metal style) or round (new plastic) fuel pump is mounted on the left side of the engine shroud behind the left valve cover. I imagine the pulse type fuel pump could be mounted on the firewall.
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1863, 1864, 48" and 54" mower decks, 54" snow plow, 451 snow blower, TracVac 580
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