vacuum questions - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 01-26-2012, 01:57 PM Thread Starter
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vacuum questions

hello. i have a 1996 vn 750 and i am having so many problems trying to figure out a couple routings of hoses. i would like to know where the line goes from the right side carb. the brass nipple. also the small vacuum line on the vacuum cylinder underneath the seat. does either of the go to the fuel level gauge attached underneath the fuel tank? sorry so much but i am kinda lost. thank you
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post #2 of 8 (permalink) Old 01-26-2012, 02:55 PM
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The best thing I would suggest is down loading the repair manual. I have it in my signature.

Oh yeah, & welcome to the forum.
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post #3 of 8 (permalink) Old 01-27-2012, 12:38 AM
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Would you believe that line from the rear carb goes to the 3-way valve under the seat? It is part of a complicated air injection system that can cause running and exhaust overheating problems. It is best to remove the entire system. I removed mine shortly after buying the bike new. Makes the bike run better, and gets rid of several pounds of clutter.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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post #4 of 8 (permalink) Old 01-27-2012, 06:00 PM Thread Starter
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thank you for the welcome. i have looked everywhere and i couldnt seem to get an answer or help at all. and you guys were already here to help. thank you for letting me know where it supposed to go. i have a haynes on the way but is it too much to ask what hooks to the fuel guage. i have plugged the electric plug un, but i cant seem to figure if a vacuum goes in it and if so which one? i cant find it in the regular service manual. i am just itching to get this thing on the road. thank you again!
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post #5 of 8 (permalink) Old 01-27-2012, 06:12 PM
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Ram, the fuel sending unit on bottom of tank is electric, for unknown reasons there is also a nipple there that looks like where maybe a vacume or vent might go. Kind of thru me off first time I had my tank off!!

04-3,200 miles bought July 2011 with 928 miles. Loaded with acessories to many to list here, see my albums for more details! I also make a custom tank bib specific for the 750 if anyone is interested, ck my albums for some pics.
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post #6 of 8 (permalink) Old 01-27-2012, 06:34 PM Thread Starter
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thanks Romeo. i have been pondering that for a while now. That's awesome that it does not need a hose. just have to figure why its not registering. i will put a test light on it and trace it and check fuse. i have a single nipple coming off the rear of the fuel tank. my guess is it is a vent that needs a hose to go to the bottom of the frame, not to be connected to anything. is that right? you guys are awesome. i am kinda embarrassed of the condition of my 750 but will be putting pics of it up as i get it together. it was a gift from my brother who didnt have time.
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post #7 of 8 (permalink) Old 01-27-2012, 06:44 PM
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No prob Ram,, You are right the nipple off the rear of tank is a vent that is routed down and usually comes out in front of rear tire, make sure that line is free of debris as it vents the tank. Read about POOGS,as there is more to that piticular vent!

04-3,200 miles bought July 2011 with 928 miles. Loaded with acessories to many to list here, see my albums for more details! I also make a custom tank bib specific for the 750 if anyone is interested, ck my albums for some pics.
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post #8 of 8 (permalink) Old 01-27-2012, 09:22 PM
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Yes, the fitting on the rear of the tank is the vent. However, there seem to be a lot of issues with venting anyway, which causes POOGS. It seems that the vent hose is routed through the gas cap, and the vent hole in the gas cap is too small, or for some reason plugs up easily. I have not really looked at it closely, because I have a CA model which has 2 fittings, one is a vent and one is an overflow. With the CA evap system removed, you can use the overflow as a vent, and it does not seem to plug up. If you hear a hissing sound right around the gas cap after parking the bike after a ride, your vent is partially obstructed. In an emergency, if the vent becomes completely plugged, you can ride it with the gas cap unlocked to vent it.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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