40hp Mariner, hard start, rough idle,planes off then dies

[Jeff Leek]

1986 40hp Mariner, 2 cylinder. Motor ran fine the beginning of the summer. Set in dry dock for about 3 weeks, then suddenly had trouble getting it started. Once it started, it idled rough and try to die. When I take off, the boat will get up to plane then die. Now this sequence of events repeats.

 

[NathanY]

Re: 40hp Mariner, hard start, rough idle,planes off then dies

Well lets see here...<br /><br />Could be losing a cylinder (spark)<br />Could be sucking air (cracked fuel line)<br />Could be that the fuel tank is not vented (self explanatory)<br />Could be dirty carbs (fuel starvation)<br />Could be faulty fuel pump (hole in diaphram)<br /><br />Check these things first, then let us know.

 

[Jeff Leek]

Re: 40hp Mariner, hard start, rough idle,planes off then dies

Thanks for the quick reply. I was not expecting to get a reply so soon. Have checked the line for cracks and the tank is vented properly. Also have checked for cylinder (spark). I will let you know what I find with the carbs and fuel pump. I should get to it in 2 or 3 weeks....boats in storage and working OT.<br /><br />Thanks,