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GS850 Vacuum petcock

  • Thread starter Thread starter peterd123
  • Start date Start date
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peterd123

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[FONT=Helvetica, Arial, sans-serif]Just picked up a brand new vacuum petcock from Suzuki, OK it's a Tourmax petcock. When i took it out the box, I found that it is set to prime, vertical position. If I suck on outlet tube, nothing. If I turn it to horizontal, still nothing when I suck on outlet. Seems a bit weird.[/FONT]
 
What is weird is you sucking on a petcock! Haha (sorry I just had to say it)
Try this. Have your wife or girlfriend suck on the vacuum hose outlet. Then you suck on the fuel outlet and see what happens. ☺
 
Ha ha, I thought that prime does not need the engine started, so as to prime carbs after a rebuild, therefore would not need vacuum.
storm 64 said:
What is weird is you sucking on a petcock! Haha (sorry I just had to say it)
Try this. Have your wife or girlfriend suck on the vacuum hose outlet. Then you suck on the fuel outlet and see what happens. ☺
Click to expand...
 
OK, thanks to you all telling me to suck on the vac side to see what happens. I did and thought nothing had happened. But now for some reason it works only on prime but not on run without vac. So it's like it need vac first. now without vac i can suck on prime...lol
 
Not any more. Without any vacuum, I can now suck on prime, but not on run.
tom203 said:
Sadly this style petcock does! In prime, it needs sucking of some sort, a brief hit on starter button should suffice.
Click to expand...
 
In its original configuration, when set to RUN, vacuum applied to the vacuum port pulls the plug away from the fuel inlet, allowing fuel to flow. When vacuum stops (when the engine stops), a spring pushes the plug back into place, stopping fuel flow.

Since you have that one-year-only (thankfully) petcock, it's good to know that when you turn it to PRIme, you do need one "puff" of vacuum to pull the plug to allow fuel flow. Turning the engine over a couple of revolutions will do that for you. It will continue to flow fuel until you turn it back to RUN or it runs out of fuel.

.
 
I've had a number of '80 and '81 GS1000Gs and 850Gs. They all had the same petcock, and not the crap one that is on my '80 GS1000E tank. I've had trouble with the '80 1000E petcock sticking closed even with vacuum. I have also put '82 850/1100G petcock on a '80 1000G with very little fiddling. the hose routing is weird, but those petcocks are less expensive, and seem to be easier to find.
 
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