Which fuel line feeds which cylinder? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 06-27-2011, 08:26 PM Thread Starter
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Which fuel line feeds which cylinder?

I've been having issues with my front cylinder going off line sometimes. I can tell because the idle will be less than normal. Pulling the front plugs do not change the idle speed. However, front plugs are very clean so it looks like they're not getting fuel (lack of spark would have resulted in dark, fouled plugs, plugs fire against cylinder, etc). So I started looking at the fuel lines and noticed the line coming off the fuel selector going backwards was pinched and leaking. I'll replace the fuel line but is it possible that the line that comes off the back of the selector feeds the front cylinder and the line that comes off the front feeds the back? The issue seems to too perfectly match my problem for it to not be true.

-Robert
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post #2 of 9 (permalink) Old 06-27-2011, 09:59 PM
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yes the line that goes to the shifter side is the front carb, the brake side is the rear carb
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post #3 of 9 (permalink) Old 06-28-2011, 12:12 AM
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The forwardmost fuel line off the petcock feeds the carb for the front cylinder, the rearward hose feeds the rear cylinder.

J.D.
Kerrville, TX
'95 Vulcan 750 "Therapy II",
aka "Raggedy Ann"
'95 VN750 project
'03 VN800B "The Little Black"
'04 VN800E Drifter project
'93 VN1500A custom project
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post #4 of 9 (permalink) Old 06-28-2011, 12:16 AM
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Quote:
Originally Posted by J.D. View Post
The forwardmost fuel line off the petcock feeds the carb for the front cylinder, the rearward hose feeds the rear cylinder.
mine are backwards then.. oh well.. it works either way
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post #5 of 9 (permalink) Old 06-28-2011, 12:21 AM Thread Starter
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Originally Posted by slimvulcanrider View Post
mine are backwards then.. oh well.. it works either way
I'm hoping mine is your way since it would explain my issues. However, it certainly looks backwards as the fuel line feeds into the carb closet to the rear cylinder. Hopefully it actually fuels the forward cylinder (i.e. that the carb is crossed)

-Robert
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post #6 of 9 (permalink) Old 06-28-2011, 12:50 AM
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Quote:
Originally Posted by RobertGary1 View Post
I'm hoping mine is your way since it would explain my issues. However, it certainly looks backwards as the fuel line feeds into the carb closet to the rear cylinder. Hopefully it actually fuels the forward cylinder (i.e. that the carb is crossed)

-Robert
It may only look that way. The front hose crosses the rear one on its way to the float chamber of the front cylinder carburetor; that float chamber is closest to the rear cylinder. The rear hose goes towards the frontmost float chamber, which is for the carb that feeds the rear cylinder.

Simplest way to look at it is the front hose ends up near the intake of the carb for the front cylinder; that intake faces rearward

J.D.
Kerrville, TX
'95 Vulcan 750 "Therapy II",
aka "Raggedy Ann"
'95 VN750 project
'03 VN800B "The Little Black"
'04 VN800E Drifter project
'93 VN1500A custom project
VROC #16185
GCVROC #33

Photo album: http://www.flickr.com/photos/leekayd/sets
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post #7 of 9 (permalink) Old 06-28-2011, 02:33 AM
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Quote:
Originally Posted by slimvulcanrider View Post
mine are backwards then.. oh well.. it works either way
Technically, it should--and if it is, I'd not mess with it; don't wanna fix what ain't broke.

J.D.
Kerrville, TX
'95 Vulcan 750 "Therapy II",
aka "Raggedy Ann"
'95 VN750 project
'03 VN800B "The Little Black"
'04 VN800E Drifter project
'93 VN1500A custom project
VROC #16185
GCVROC #33

Photo album: http://www.flickr.com/photos/leekayd/sets
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post #8 of 9 (permalink) Old 06-28-2011, 02:05 PM Thread Starter
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So is the best routing off the tank to go straight back and then 90 degree turn inboard to the carb? Right now mine goes over the top of the carb and got pinched and torn against between the carb and the tank.

-Robert
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post #9 of 9 (permalink) Old 06-29-2011, 02:35 AM
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Quote:
Originally Posted by RobertGary1 View Post
So is the best routing off the tank to go straight back and then 90 degree turn inboard to the carb? Right now mine goes over the top of the carb and got pinched and torn against between the carb and the tank.
-Robert
The rear hose is just long enuff that it crosses the low forward top of the front (left) carb. The front hose is a little longer, and crosses over the other one between the carbs. There's a diagram on pg. 2-16 in the manual.

Jim

J.D.
Kerrville, TX
'95 Vulcan 750 "Therapy II",
aka "Raggedy Ann"
'95 VN750 project
'03 VN800B "The Little Black"
'04 VN800E Drifter project
'93 VN1500A custom project
VROC #16185
GCVROC #33

Photo album: http://www.flickr.com/photos/leekayd/sets
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