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More petcock help!

  • Thread starter Thread starter gjsuzuki
  • Start date Start date
G

gjsuzuki

Guest
Just rebuilt my carbs and I'm trying to run some gas into them off the bike to make sure my old float needles are still good to go, but no gas will come out of the petcock on prime. Just drained and cleaned the tank a week ago and filled it with new gas. Petcock did not look clogged at all. Now, no gas will come out. Ideas?
 
I don't know what bike you have, but my petcock needs a vacuum to start the fuel flow, even on prime. On prime, it just needs one pulse of vacuum and it flows forever (even if the vacuum is then removed).
 
gjsuzuki said:
Just rebuilt my carbs and I'm trying to run some gas into them off the bike to make sure my old float needles are still good to go, but no gas will come out of the petcock on prime. Just drained and cleaned the tank a week ago and filled it with new gas. Petcock did not look clogged at all. Now, no gas will come out. Ideas?
Click to expand...

put a hose on the vacuum of the petcock and gently suck should start the fuel flowing
 
If no gas comes out with petcock lever in "PR" spot, your petcock is no good - no matter how pretty it looks. Don't waste your time with a 32 yearold unit- get new one for $50.
 
It's an '82 GS750T. Didn't need any vacuum pressure when I originally drained the tank to get gas out, which is why I think something is wrong. Could buy a new one....OEM petcock is about 80 bucks though, according to what I've seen. Seems like a waste though if it was just working a week ago. I find it hard to believe after 30 years it suddenly stopped working right as I was doing repairs to the bike.
 
gjsuzuki said:
It's an '82 GS750T. Didn't need any vacuum pressure when I originally drained the tank to get gas out, which is why I think something is wrong. Could buy a new one....OEM petcock is about 80 bucks though, according to what I've seen. Seems like a waste though if it was just working a week ago. I find it hard to believe after 30 years it suddenly stopped working right as I was doing repairs to the bike.
Click to expand...

Old o-rings dried out from sitting empty (even for a day or two) and now doesn't work.

Buy a new replacement. Not even worth getting upset over a rebuild kit that doesn't work. Been there and done that. :-\\\
 
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