Merc 115 fuel problem

Bob37814

Bob37814

Seaman
Joined
Aug 3, 2008
Messages
73
Merc inline 115 s/n 5416341 I pump the bulb until I get gad squirting out of the top carb, It will start and run and idles at about 1000rpm. I can rev it up using the fast idle on the control box, but if i completely close the fast idle it fades down and stalls in about 5 seconds and then after much choking and pumping the bulb it starts and does the same thing. I noticed the bulb is not hard after it dies......Would it be worth my while to throw a fuel pump kit at this deal or am I looking after something else????? Thanks so far on this motor. Trying to get the bugs out of it since i got her running finally:D
 
Yepblaze

Yepblaze

Lieutenant Commander
Joined
Jun 1, 2001
Messages
1,686
Re: Merc 115 fuel problem

The over flowing carb says the carb(s) need attention. Perhaps new needle/seat(s)

And if it is starving out once underway service the fuel pump.

If you buy the check valve kit, it comes with diaphrams.
 
H

honestcharlie56

Cadet
Joined
Jul 10, 2008
Messages
27
Re: Merc 115 fuel problem

have you rebuilt the carbs yet, you shouldnt have gas shooting out of a carb when you pump the bulb
 
Bob37814

Bob37814

Seaman
Joined
Aug 3, 2008
Messages
73
Re: Merc 115 fuel problem

I have been told that its easy to overpressure the carbs on these old inlines. I have to really force the primer bulb to get it to drip a few drops, hence the top is the only one that does drip. I have not rebuilt the carbs but im guessing that is next on the agenda, along with the fuel pump for good measure
 
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