I just rebuilt the leaking fuel tank petcock...... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 3 (permalink) Old 09-19-2011, 10:15 PM Thread Starter
..have a vulcan good day!
 
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Smile I just rebuilt the leaking fuel tank petcock......

Fuel Petcock ’86 vn750

I just rebuilt the leaking fuel tank petcock, installed tank on bike and dumped a gallon of fuel in. I needed to remove remove tank again, and when I pulled the fuel lines off the petcock, fuel poured out of the petcock.

The petcock has “Pri” , “On”, & “Pri” settings.

Question: Doesn’t the vacuum from the left carb control the petcock fuel flow ?
Any assistance is much appreciated.

Tia
WilliamTech

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #2 of 3 (permalink) Old 09-19-2011, 11:09 PM
If only it had 6th gear..
 
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Yes the petcock should only flow when vacuum is applied.... unless you have it in the 'PRI' position. Then it will flow no matter what. That position is only used to prime the float chambers. But when 'ON' or 'RES' no fuel should flow at all until engine runs. Did a new diaphragm come with the rebuild kit? If gas flows in those other positions I wonder if the diaphragm spring is seated correctly.

Dave

Mods:
Jetted, shaved & coastered
Home made under-tank single filter
Converted ACCT's to manual (thanks wib714)
Dual vac lines on petcock (my cure for ticking)
LED tail/plate lights
Relocated helmet lock to license plate

Added stuff:
Customized hard bags w/ lights
Chrome levers
Hellcat windscreen
LED running lights
Home made 'Vita-Volt' meter
Foot rests on engine guard
Tunes

Hmm....she was on the back when we left.... ??
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post #3 of 3 (permalink) Old 09-20-2011, 12:10 AM Thread Starter
..have a vulcan good day!
 
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Quote:
Originally Posted by DavesVulster View Post
Yes the petcock should only flow when vacuum is applied.... unless you have it in the 'PRI' position. Then it will flow no matter what. That position is only used to prime the float chambers. But when 'ON' or 'RES' no fuel should flow at all until engine runs. Did a new diaphragm come with the rebuild kit? If gas flows in those other positions I wonder if the diaphragm spring is seated correctly.
Yes, something along that line is wrong. I will take it apart tomorrow in attempt to correct my wrongs.

LOL

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
WilliamTech is offline  
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