1996 115 Johnson problem

" I picked up a 115 for my 16

" I picked up a 115 for my 16 y.o. son and I to run around with on a 19 foot boat. It was running poorly at low idle and ok as he revved the motor up. Seems to be missing at low idle. We took it out and as we were running, the primer bulb got flat and it began to stall. Before we started, I primed it until it was hard. Could it be the fuel pump? If there was a leak in the line the primer would not have gotten hard, right? or wrong? Could it be a fuel pump, I never thought they were a problem. This engine has no oil injection, it is a 115 SPL. I dont know it it was removed or came without oil injection. Any thoughts are always appreciated. Maybe it is not fuel at all, or it is a combination of things, thanks guys "

" JT.... The primer bulb being

" JT.... The primer bulb being drawn flat indicates that a fuel restriction exists between the fuel bulb and the fuel supply.

If you're using a portable tank that incorporates a vent, I suspect that the vent was closed or the fuel connector was not connected properly at the tank.

If a built in tank was being used, the problem would be a clogged vent, or most likely a sticking "Anti Siphon" valve, in which case the cure follows:

(Fuel Anti Siphon Valve)

Many of the later OMC V/6 engines incorporate a fuel restriction warning via a vaccum device attached to the powerhead. If the engine overheats, or if you have a fuel restriction, the warning is the same.... a steady constant beep.

NOTE... Only the V/6 & V/8 engines have the above "Fuel Restriction Warning". The warning horn will not sound on the other models.

The fact that a engine is not overheating, but the warning horn sounds off with a constant steady beep, and that the rpms drop drastically would indicate that the engine is starving for fuel due to a fuel restriction.

Check the built in fuel tank where the rubber fuel line attaches to the tank fitting. That fitting is in all probability a "Anti Siphon" valve which is notorious for sticking in a semi closed position. It will be aluminum, about 2" long, and the insides of it will consist of a spring, a ball, and a ball seat.

If this valve exists, remove it, knock out those inner components which will convert it to a straight through fitting, then re-install it. Hopefully that cures the problem.

Joe (30+ Years With OMC) "

" Actually, I was running it o

" Actually, I was running it off an OMC 6 gallon metal tank, I will try and see if there is a problem with it. "