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fuel valve?

C

cceretti

New member
Can someone tell me what the little red tab on my fuel system is for? Its behind an air-chuck type valve on the front side of the engine. Handy all the fuel lines and such. Its a 115 johnny. 2000 model i think. The motor quits when i turn this tab a half turn clockwise. Thats all it turns. Im assuming its a fuel shut off??? Im a complete newbie so please forgive the ignorance. Just trying to get this motor running a bit smoother before i take her too far. She hasn't run in a long time and was neglected by the looks of things. I also checked Compression numbers and was getting 130+/- 5psi on all cyls cold. About 5-10psi less on each cly when warm. Are these acceptable numbers? Thanks all.
 
The device that red lever is on is the fuel primer. It's normally activated by pushing in the key. If the electric part fails, you can turn the lever to prime the engine manually. The tire valve is for injecting fogging oil or engine tuner from the OMC/BRP injection can. The engine quit when you turned it because it flooded with fuel.
 
(Fuel Primer Solenoid Function)
(J. Reeves)

The RED lever...... The normal operating/running position is to have that red lever positioned over top of the solenoid and aimed at the other end of the solenoid, gently turned to its stop. This is the normal/automatic mode position. Pushing the key in opens the valve within the solenoid allowing fuel to pass thru it in order to prime and start the engine. Looking upon this solenoid as a electric choke results in a better understanding of it.

Having that red lever turned in the opposite direction, facing away from the solenoid, allows fuel to flow thru it to the crankcase area. One would only turn the red lever to this position in a case where the battery might go dead and the engine had to be started via the rope pull method. Look upon putting the red lever in this position as moving a choke lever on a choke equipped engine to the full closed position. Either one would supply fuel to the crankcase/engine for starting purposes BUT if left in that position while running would flood the engine.

The later model primer solenoids are equipped with a schrader valve, used for attaching a pressurized can of fogging oil etc, available at your local dealership with complete instructions.

Pumping the fuel primer bulb up hard fills the carburetor float chambers of course, but that process also applies fuel pressure to the primer solenoid.
The two small hoses leading from the primer solenoid branch off via tees to each fuel manifold section that would feed fuel to the individual cylinders.
Pushing the key in activates the primer solenoid to allow fuel to flow thru it to the intake manifold passageways. Cranking the engine over causes the fuel pump to engage which in turn sends fuel pulses to the primer solenoid via the 3/8" fuel hose.
Some engines incorporates the "Fast Start" feature which automatically advances the spark electronically so no advance of the throttle is required for starting.
Engines that do not have the "Fast Start" feature will be required to have the throttle advanced slightly.
Starting procedure: pump fuel bulb up hard, crank engine and push the key in at the same time. When the engine fires/starts, release the key so that it falls back to the run position.
Bottom line..... Look upon the primer solenoid as an electric choke.

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Excellent, thank you! I figured the air schrader valve was for fogging, but it never hurts to ask. Any input on the compression numbers?? 130 cold..120 hot...
 
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