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What does this part do

S

snookwhaler

Regular Contributor
"1983 50HP Johnson, Long Shaft

"1983 50HP Johnson, Long Shaft, Elec. Start.

I found a fuel leak. So, I am replacing all the fuel lines and vacuum tubing. I found some hoses running to this part with the red lever on it? What is this thing?
85692.jpg
What Part is this?
 
"Thanks... What exactly is its

"Thanks... What exactly is its function? And what position should this lever be in?

We had this boat out on the water a couple days ago. Started and ran fine. Later in the day after a couple hours of use (on and off), the motor started missing on mid to top throttle. On the way home we only had partial throttle. Going to wide open the motor seemed to run ok. But much slower.

We found some fuel leaks and replaced all the lines. Pulled and cleaned the plugs and now the idle seems a little off with an occasional sputter.

Is there a mixture adjust with these carbs.? I dont see needle valves like on my 35.

Does this sound like a carb problem? Or maybe something else? Like the power pack.

My thinking at this point is to pull the carbs, pull the bowls and blow some carb cleaner through them.

Any other ideas?

Thanks,

AJ"
 
"My guess is that it sqirts a

"My guess is that it sqirts a little bit of fuel in to the intake manifold just past the carbs at startup when you choke the motor. The lever is for manual operation. I don't know what position it should be in.

If you motor ran fine before, I wouldn't make any adjustments until I pulled the carbs. Unscrew the bowls and make sure all the jets (Screws with holes in them) are clean. Check needle seat also. Make sure float doesn't have any fuel in it. Put it back together and try to fire it up. Then you can start making adjustments if it isn't right.

With this new E-10 fuel, a lot of gunk builds up in the carbs if they sit for long. Also, the E-10 fuel reacts with old gas tanks and also cleans the gas tanks but sends all the crude to the carb. You might want to consider a fuel filter.

Check fuel pump also. Make sure the screen isn't clogged.

http://www.crowleymarine.com/brp_parts/diagrams/17205.cfm

http://www.crowleymarine.com/brp_parts/diagrams/4395.cfm

I'm no expert but this would be where I'd start. Check the fuel pump filter first. That's easiest.

Ken"
 
That is kind of what I figured

That is kind of what I figured. Was not sure.

When we replaced all the fuel line this morning. I checked the fuel pump and filter screen. It was spotless. The inline filter is brand new. So that is not it.

We are going to perform a compression check and pull and blow out the carbs tonight.
 
Hi...The red leaver is in the

Hi...The red leaver is in the correct position in the picture...the lever moves to an open position so the engine can be primed manually in case of a dead battery and have to rope start...
 
Compression check was good and

Compression check was good and carbs were clean.

The problem turned out to be some bad fuel line and a bad (torn) fuel pump diaphragm. Also the plugs were a little old and fouling easily.

Thanks for the input.

AJ
 
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