Re: 40 HP Mariner, gas from prop exhaust & yr?
40C EL sn 6E9-416473 thru 6E9-421567 1985 <br /><br />I would start by putting a new diaphram in the fuel pump ($10)<br /><br />When the get old, they develope holes, which leak into the crankcase, causing the engine to run rich, and can cause the plugs to foul, and raw gas to exit thru the exhaust.