The boat I recently purchased has a 74 merc. in-line 6. It won't start unless I shoot a little Starting fluid in the carbs. Once started, it runs OK. I can also shut it down, and it will restart. The boat sat for 2 years before i bought it, so would gummy carbs be the problem? The bulb does get firm after a couple squeezes.<br /><br />After purchase, I siphoned the fuel out of the tank and put in fresh fuel/oil, put in a new water separating filter, and also threw in a can of sea foam. <br /><br />Think I need to tear the carbs off and rebuild 'em?