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I am replacing all hoses and tubing associated with the fuel system on this 1989 Johnson 120 in order to check items off my list of reasons this motor starts, runs rough for about a minute or two then cuts out. I have come to this item that I can't figure out and haven't been able to find on the internet. What is it?
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That my friend is the component that replaces the automatic choke solenoid and the carburetor butterflies. It is called a "Fuel Primer Solenoid" and it acts exactly like a electric choke would. See the following:
(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 pa$$ thru it in order to prime and start the engine. Looking upon this solenoid as a electric choke results in a better understanding of it.
Having that red lever turned in the opposite direction, facing away from the solenoid, allows fuel to flow thru it to the crankcase area. One would only turn the red lever to this position in a case where the battery might go dead and the engine had to be started via the rope pull method. Look upon putting the red lever in this position as moving a choke lever on a choke equipped engine to the full closed position. Either one would supply fuel to the crankcase/engine for starting purposes BUT if left in that position while running would flood the engine.
The later model primer solenoids are equipped with a schrader valve, used for attaching a pressurized can of fogging oil etc, available at your local dealership with complete instructions.
Pumping the fuel primer bulb up hard fills the carburetor float chambers of course, but that process also applies fuel pressure to the primer solenoid.
The two small hoses leading from the primer solenoid branch off via tees to each fuel manifold section that would feed fuel to the individual cylinders.
Pushing the key in activates the primer solenoid to allow fuel to flow thru it to the intake manifold pa$$ageways. 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.
Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay auction at:
joe_omc32 | eBay
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Thanks Joe! Mystery solved. I appreciate your taking the time to explain how it operates and it's functionality.
On another matter, I took my VRO fuel/oil pump apart to clean and check for varnish, crud, etc and when it came time to re-assemble I seemed to be short an O-ring. I might have misplaced it, (I've seen me do that before) but I don't believe there was one in the first place. Of course if I want to get another, I have to buy the whole rebuild kit for approx. $150 because I can't lay my hands on "just" an (one) O-ring.Comment
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Take the pump with you to an ACE Hardware store. Most of them have a good selection of O rings. Find one that fits (if one does belong on it)Comment
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