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Fuel in petcock vacuum line

  • Thread starter Thread starter slyone
  • Start date Start date
Simple to replace.
Repairs sometimes work, sometimes not.
You need a new diaphragm.
 
petcock works good (though I haven't "tested it") but must have a small leak internally into vacuum portat petcock and just want to correct everything best I can. Looks like there's about 4 gaskets/seals to refresh but z1 only shows the 1 diaphragm, guess I better look further.
I also would like to know more about checking my float levels with bowls on cause I think I'm on the high side which I believe would set me up for a richer running condition which I want to stay away from somewhat.
 
You might want to make sure it's not just condensation before spending the cash on a petcock. A clear tube in place of the vacuum tube should help.
 
Nessism said:
You might want to make sure it's not just condensation before spending the cash on a petcock. A clear tube in place of the vacuum tube should help.
Click to expand...
It's definitely gas and is wet on the nipple as well. I would plan to get the gaskets and seals to repair and not replace petcock as an assembly
 
A bit pricey, but youll never replace it again..AND ..I have tried 2 rebuild kits and each has failed for whatever reason. What you do with this is simply put a tee in the vac line and run one to the tank and one to this inline fuel shut off.
EDIT....This will handle the fuel line...but just how to get around the leak into the vacuum line your gonna ask ?? I think I would simply put the pingle in the fuel line and remove the diaphram all together so the petcock will flow continuously, because now the pingle will shut off the fuel. Put a rubber cap over the vacuum nipple on the petcock. Put a paper gasket in place of the removed diaphgram.



http://www.pingelonline.com/powerflo_9050.htm
 
Last edited:
I would..however..replace the gasket thats just behind the petcock handle and the Oring in there.
 
wow that's strange that you've tried twice without success? Had you used genuine factory parts on either repair? It just seems so straight-forward. Interesting work arounds at an affordable price too, but I really would rather keep it all stock. Maybe I'll put this one on the back burner until spring arrives! lol
 
Some of the petcock bodies are too corroded, and some of the petcock kits just do not fit, at all. It depends on the petcock.
 
Had the same problem. Terrible fouling on the #2. Derp. Boss said they never really had luck with rebuilding petcocks and we didn't have a diaphragm kickin around but there was a brand new petcock. Not cheap at all but here are the part numbers:
FUEL COCK O RING $5
44348-31051

COCK ASSY, FUEL $110
44300-45011

We might even have one in stock, I'll have a look.
 
The following IS NOT a slam at Z1...but i bought 2 kits for the GS 1000 at the same time. I cleaned up the insides of the petcock and the area the oring on the diaphram sits was smooth and shiney as new. neither kit would seal and gas INSTANTLY porued out from the petcock like it was set on prime..but it wasnt. I even tried a slightly smaller thickness oring thinking that would seat better but that wasnt the fix either. Anyone remember my thread on this??? Neither kit worked so they both went in the trash and it was a waste of time and money far as i was concerned and another one will never be bought by me. I wound up buying a good 750 one from a member here and thats whats on the bike now...without issues.
 
They are exactly the same as the 1000s except the angles the fuel and vac nipples are at. A 750 will direct bolt to a 78 1000. Dont know about your 850 though.
 
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