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1980 115hp Primer line routing

bill_w

bill_w

Advanced Contributor
Does anyone have a diagram showing where the primer lines run to from the primer solenoid? On my motor, one line splits at a T, and runs to the upper and lower starboard side intake covers. The other line from the primer dissapears somewhere in behind the carbs.

Looking at my 150, the lines from the intake covers are re-circ lines, that just run back to the intake manifold, and the primer lines run to the top of the carbs. The 115 does not have the fittings on the top of the carbs for the primer lines, so I'm guessing they should run to the intake manifold, not to the intake covers.

Or am I out in left field.

thanks,
Bill
 
OK, looking thru the parts diagrams, they show 4 check valves on the intake manifold, and 2 'T' fittings from the primer. One nipple on the intake port cover, one nipple on the intake manifold. So, doing the math, the 2 'T's and the 4 check valves should be the primer lines, and the nipples on the intake cover and intake manifold should connect, at least if I'm doing the math right. I've got a factory manual on the way, but it's a week or so in the mail.

Am I right? This motor is really hard to start cold, but the primer solenoid does work. I just don't think the extra fuel is going where it should go.
 
Racerone...I had another look at the motor this weekend. I was wrong, the primer lines run into all four of the intake covers, and not into the manifold at all. I didn't think to trace the recirc lines, there may not even be any on this motor. I'm with you, I will wait for the manual.

On the other hand, now that it's charging, it's starting better. Probably turning over faster.
 
I've got the factory manual now, the primer lines are run correctly, one line to each intake cover. But, since I've changed the carbs to a later model, with the fitting for a primer line at the top of each carb, would I be better off running the primer lines to the carbs? Kinda makes more sense to have the extra fuel pumped in at the carbs, then at the intake covers. And, thats the way OMC did it a couple of years later.
 
To me it makes more sense to pump the fuel in at the intake ports !!!!-----Right where air is pushed into the cylinder by crankcase compression.
 
Then why would OMC change it to the carb location on later models? Maybe better atomization and mixing with the air? Hell, I don't know, I'm just trying to get this thing to start better.
 
You are repairing the motor in your backyard !!---------The motor is assembled in a " factory "-------------Now in a factory the scheduling of where and when to paint the motor and then add the accesories after painting comes in to play.-----It certainly takes less time to install those 2 -8" long hoses on the later models than to snake in the longer hoses and to make sure the long hoses are not pinched when other pieces are bolted on !!!
 
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