Fuel leak, NO overflow.

  • shamal
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Fuel leak, NO overflow.

05 Feb 2016 11:14
#709551
: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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  • shamal
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Re: Fuel leak, NO overflow.

05 Feb 2016 11:25
#709556
To be more accurate the bike is running great.
I can rule any vacuum leak
1983 kz 550 h

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  • Patton
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Re: Fuel leak, NO overflow.

05 Feb 2016 16:26 - 05 Feb 2016 16:27
#709630
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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  • shamal
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Re: Fuel leak, NO overflow.

05 Feb 2016 20:51
#709658
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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Re: Fuel leak, NO overflow.

06 Feb 2016 03:31
#709668
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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  • jdvorchak
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Re: Fuel leak, NO overflow.

06 Feb 2016 04:26
#709676
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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Re: Fuel leak, NO overflow.

06 Feb 2016 04:31
#709678
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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  • Patton
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Re: Fuel leak, NO overflow.

06 Feb 2016 04:32
#709679
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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Re: Fuel leak, NO overflow.

06 Feb 2016 04:33
#709681
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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Re: Fuel leak, NO overflow.

06 Feb 2016 04:36
#709682
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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  • Patton
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Re: Fuel leak, NO overflow.

06 Feb 2016 04:39 - 06 Feb 2016 05:22
#709683
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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  • strum
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Re: Fuel leak, NO overflow.

06 Feb 2016 04:43
#709685
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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