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1977 gs750 fuel coming out of crank case vent tube

  • Thread starter Thread starter hdcrossbones09
  • Start date Start date
You can attach more than one image to a message, they just have to be hosted elsewhere and linked into your post.
 
last 1 unless someone needs something specific sorry thanks

Yeah that last picture they have the vacuum and fuel ports on the petcock teed together. That is wrong. It should not flow fuel except on "PRI", and if it does the petcock diaphragm is shot and you're getting fuel through the vacuum tee (effectively you're always flowing fuel as on PRI). The needle valves in the carbs are not meant to hold back a constant steady pressure of fuel when not in operation, and are leaking and overflowing into your airbox.

The idea is that the petcock should not flow fuel in the ON position unless the diaphragm is getting vacuum (because the engine is running) via the vacuum port on carb #3 (that's carb #2 BTW on the 80-82 CV carbs, not that you care).

The vacuum port should be connected to the hose coming off of #3 carb. The hoses from #2 and #4 are vent hoses and the ends should be left in a relatively turbulence-free area. Where is the hose from #3 leading now? I hope it is at least plugged.

OEM replacement petcocks still appear to be available for $75-$100.
 
Go back and read thru BassCliffs site on posting pictures and repairs, especially the 10 things


That's one seriously messed up bike, I wonder what else the PO did that's just completely wrong?

Get some new fuel line from the T to the petcock, run the hose on #3 to the petcock and see what happens

Have you checked your oil level? Does your oil smell like gas?
 
Hi,

Have a look at this:

Where Do These Hoses Go?

Your carbs are the VM style so the vacuum port on the petcock will attach to the #3 carb, to a nipple on the top/rear of the carb (not the #2 like on the CV style carbs). Each of your carbs will have a drain hose. The fuel line runs to the "T" between the #2 and #3 carbs.

I'll bet there's gas in your oil. You'd better change it.


Thank you for your indulgence,

BassCliff
 
I can't find the vacuum port between the carbs that runs to the petcock
 
ON the LEFT side of carb 3 sticks out at an angle just above and to the right of the fuel tee in the center..... kinda in the middle of the carb body.
 
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