1979 mercury 140 inline 6 turns over but wont start

[weslwl]

engie will turn over but wont start. had it running cut it off hit the switch started right back up. let it sit for about 15 min and now it wont start back up.could it be my float level to low,fuel punp,low battery,sometimes i spray fuel mix in carbs it will start but die immediately.any help would be greatly appreciated.

 

[JB]

Re: 1979 mercury 140 inline 6 turns over but wont start

Sounds like a failure in the fuel supply, wes.<br /><br />Clogged or restricted vent on the tank, pickup in the tank, restricted or air leak in the line, failed fuel pump. Could also be water in the fuel or a plugged up filter.<br /><br />Very unlikely that all carbs would fail at once, and if she pops when you spray premix into the carbs that says she isn't getting fuel to any of them.<br /><br />Good luck.

 

[jimmbo]

Re: 1979 mercury 140 inline 6 turns over but wont start

Does it have spark? If you are running on the 6 gal tank, make sure the vent is open. Are you squeezing the primer bulb till it gets hard? If it doesn't get hard, is it pissing fuel out the carb vents? That would point to a too high float setting and/or stuck float

 

[weslwl]

Re: 1979 mercury 140 inline 6 turns over but wont start

i pumped the heck out of the primer until gas starts dripping out the front of the center carb.then she will fire right up and the carbs dont leak while running. hopefully i will get to try it out thursday evening on the river.

 

[mudrow]

Re: 1979 mercury 140 inline 6 turns over but wont start

If you can keep it running for any time with the spray fuel mix ( with Oil ) then it has to be a fuel problem and not electrical. start with the tank and work your way to the carbs checking everything in between. motors that have set over winter can have several problems arise after no use. check the other posts and you can find a lot of what to do also with others that have similar problems carbs and such. Good Luck