advice on fuel petcock (?) needed - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 08-27-2009, 10:11 PM Thread Starter
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advice on fuel petcock (?) needed

So I'm finally starting to do some maintenance and replacement jobs on my recently acquired vn750. First job is the cooling system, that hasn't been functioning well (one of the hoses tore and I got sprayed with coolant last saturday). Got it all off now and am cleaning it (radiator, thermostat etc) and replacing the hoses.
The issue is, that on taking off the fuel tank, I noticed that one of the vacuum leaders is leaking fuel. I understand that the two lateral pipes that com out of the tank are vacuum pipes, the middle one is the fuel one. So one closing the fuel valve there shouldn't be leaking fuel, right ?
I'd appreciate an explanation on what is happening here, and the procedure to be followed. Thanks in advance !
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post #2 of 9 (permalink) Old 08-27-2009, 10:37 PM
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You've got the vacuum and fuel lines confused. There are two fuel lines (one to each carb), and one vacuum line. Probably ought to replace all of them at the same time.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
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1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #3 of 9 (permalink) Old 08-27-2009, 10:46 PM Thread Starter
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ok, I'll check it out

Quote:
Originally Posted by flitecontrol View Post
You've got the vacuum and fuel lines confused. There are two fuel lines (one to each carb), and one vacuum line. Probably ought to replace all of them at the same time.
Hmm - thought I got it right from the Clymer manual. Thanks for the quick reply !
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post #4 of 9 (permalink) Old 08-27-2009, 10:53 PM
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Well, I've been wrong before! Looking in my Clymer and Kawasaki manuals now.

Update: Clymer, page 275, 4. disconnect the fuel line (figure 83) from the fitting on each side of the fuel cutoff valve.

Yep, two fuel, one vacuum.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts

Last edited by flitecontrol; 08-27-2009 at 11:00 PM.
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post #5 of 9 (permalink) Old 08-27-2009, 10:56 PM Thread Starter
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but what you say makes sense

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Originally Posted by flitecontrol View Post
Well, I've been wrong before! Looking in my Clymer and Kawasaki manuals now.
two carbs two hoses makes sense - but then, with the fuel valve closed, the valve pipes shouldn't leak should they (it's one of the pipes that leaks, not the hoses) ? Should I replace something ?
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post #6 of 9 (permalink) Old 08-27-2009, 11:07 PM Thread Starter
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Hmm - good lesson for a first time mechanic. But it's fun and the bike is great. Thanks !
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post #7 of 9 (permalink) Old 08-27-2009, 11:08 PM
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Quote:
Originally Posted by wouter View Post
two carbs two hoses makes sense - but then, with the fuel valve closed, the valve pipes shouldn't leak should they (it's one of the pipes that leaks, not the hoses) ? Should I replace something ?
Not sure what you are calling the valve pipes. Do you mean the metal hose fittings (nipples) on the fuel shutoff valve? If one is leaking, could it be cracked? If both are leaking, the valve may need to be repaired.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #8 of 9 (permalink) Old 08-27-2009, 11:09 PM
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Quote:
Originally Posted by wouter View Post
two carbs two hoses makes sense - but then, with the fuel valve closed, the valve pipes shouldn't leak should they (it's one of the pipes that leaks, not the hoses) ? Should I replace something ?
The outlets on the petcock are press fit, use a c-clamp to to press back into the petcock.


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post #9 of 9 (permalink) Old 08-28-2009, 11:41 AM Thread Starter
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Ok, I'll check it out. Lance, I send you a pm on coaster and r/r kits.
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