Fuel leak, NO overflow.

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05 Feb 2016 11:14 #709551 by shamal
Fuel leak, NO overflow. was created by shamal
:dry: how is this possibile? I noticed a small gas leak, a drop, under the #1 intake boot. Just between the boot and the head.
Carbs are fine. No running problems. No overflow. :S
1983 kz 550 h

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05 Feb 2016 11:25 #709556 by shamal
Replied by shamal on topic Fuel leak, NO overflow.
To be more accurate the bike is running great.
I can rule any vacuum leak
1983 kz 550 h

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05 Feb 2016 16:26 - 05 Feb 2016 16:27 #709630 by Patton
Replied by Patton on topic Fuel leak, NO overflow.
Make/model??

Vac to petcock off #1??

Good Fortune! :)
1973 Z1
KZ900 LTD
Last edit: 05 Feb 2016 16:27 by Patton.

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05 Feb 2016 20:51 #709658 by shamal
Replied by shamal on topic Fuel leak, NO overflow.
83 gpz550h
Vacuum petcock disabled.
I just use PRI position, and when the ignition switch is off a 12volts magnetic valve on the fuel line is closed.
1983 kz 550 h

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  • SWest
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  • 10 22 2014
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06 Feb 2016 03:31 #709668 by SWest
Replied by SWest on topic Fuel leak, NO overflow.
Magnetic valve? Pics?
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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06 Feb 2016 04:26 #709676 by jdvorchak
Replied by jdvorchak on topic Fuel leak, NO overflow.
You say vacuum petcock is disabled but do you still have the vacuum line running from #1 to the petcock?

and if it is really leaking gas between the cylinder head and the boot, you have a vacuum leak. If gas is getting through then so is air.
Don't fix it until it's broken.
John

83 KZ550M1
83 KZ1100LTD

Also own:
2010 Harley Ultra Classic Limited, 2008 Harley low rider 71 CB350/sidecar

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  • SWest
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  • 10 22 2014
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06 Feb 2016 04:31 #709678 by SWest
Replied by SWest on topic Fuel leak, NO overflow.
You're right, I'm still stuck on the magnetic valve. Does it have a fuel gauge?
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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06 Feb 2016 04:32 #709679 by Patton
Replied by Patton on topic Fuel leak, NO overflow.

shamal wrote: 83 gpz550h
Vacuum petcock disabled.
I just use PRI position, and when the ignition switch is off a 12volts magnetic valve on the fuel line is closed.


Hopefully, there isn't an unused vacuum hose attached to the #1 carb holder.

Hopefully, the vacuum nipple is capped/plugged on the #1 carb holder.

Pods or stock airbox?

Good Fortune! :)
1973 Z1
KZ900 LTD

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06 Feb 2016 04:33 #709681 by jdvorchak
Replied by jdvorchak on topic Fuel leak, NO overflow.
My guess is that the float on #1 is seeping or stuck and allowing too much fuel in the bowl.
Don't fix it until it's broken.
John

83 KZ550M1
83 KZ1100LTD

Also own:
2010 Harley Ultra Classic Limited, 2008 Harley low rider 71 CB350/sidecar

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  • SWest
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  • 10 22 2014
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06 Feb 2016 04:36 #709682 by SWest
Replied by SWest on topic Fuel leak, NO overflow.
I'm betting on a leaky petcock.
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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06 Feb 2016 04:39 - 06 Feb 2016 05:22 #709683 by Patton
Replied by Patton on topic Fuel leak, NO overflow.
Has the clear tube test been performed on #1 carb to assure that the fuel level is within specs and not too high?

Here, for reference , is the stock vacuum operated petcock:






Why was the petcock's vacuum function abandoned in favor of a magnetic valve?

Good Fortune! :)
1973 Z1
KZ900 LTD
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Last edit: 06 Feb 2016 05:22 by Patton.

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06 Feb 2016 04:43 #709685 by strum
Replied by strum on topic Fuel leak, NO overflow.
Yeah when you say vacuum disabled and just using prime. then all you have to depend on to hold fuel back is the float needles.
I betting on a seeping needle and I agree with the past statement. if fuel is getting out then air is getting in.
This exactly why i went with a manual petcock.
Blairsville Ga.

1980 KZ1000 Shaft (sold and missed already)
2003 ZRX 1200R (sold)
2003 Concours ZG1000 (just purchased)

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