tank swap to CA tank - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 04-25-2016, 03:38 PM Thread Starter
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tank swap to CA tank

ok guys need some help/advice. got a newer ca tank for my 94, vented both vents together and out the back. had to replace rear line to the petcock because it was split. used 1/4 fuel line, and got it all together, but now wont idle with out the choke on, and dies when i try to apply throttle. the old tank was off for a few months, but i plugged the lines so nothing crawled in and made a home.

1994 Vulcan 750 13000 miles
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post #2 of 5 (permalink) Old 04-25-2016, 03:54 PM
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could still have something in the carb gummed up or dirty. todays fuel's with ethanol do NOT like sitting in carbs (or should I say our carbs do not like it sitting in them).

also, try with the gas cap open.. to see if the tank is venting properly

2005 VN750

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post #3 of 5 (permalink) Old 04-27-2016, 04:44 PM
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With a CA tank (2 nipples at the bottom of the tank near the seat), the right line actually ends inside the tank, so I doubt that it is a venting issue.

Most likely scenario is that something is clogging a line someplace (kinked line possibly) or the fuel is not flowing due to bad petcock or no vacuum to the petcock to open the fuel flow. Did you route the vacuum line from the carb to the center nipple of the petcock? did you cap off the other vacuum line from the other carb?
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post #4 of 5 (permalink) Old 04-27-2016, 04:49 PM
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I agree that it's probably unrelated to the tank itself. Something else has been disturbed, kinked, etc.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
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Rebuilt Forks w/ Progressive Springs
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1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

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1989 Pontiac Firebird Formula 350
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post #5 of 5 (permalink) Old 05-18-2016, 09:13 AM
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First of all find out if you are getting fuel flow from the petcock when you apply vacuum to it. If you are, it is not the tank/petcock. If you did not drain the carbs while the bike sat, you probably have a really nasty rusty corroded mess inside. I kept my carbs filled with Seafoam while I had the engine out for the better part of a year. You can remove the jet chamber covers with the carbs still on the bike. Get a mirror and look up in there and see what it like. Since that is the lowest point where there is fuel, it is the last place the fuel will evaporate from, and will likely have the worst damage. I would also remove the coasting enrichener diaphragms and see if they are damaged. Mine melted from ethanol.

The CA tank is the one to have, since it gives you a positive vent if the normal vent that goes through the fuel cap becomes plugged up.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
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