Two Steps Forward, One Back - Carbs leaking fuel - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
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post #1 of 40 (permalink) Old 09-26-2017, 12:19 AM Thread Starter
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Two Steps Forward, One Back - Carbs leaking fuel

I've been working on an 86 750 with 15,500 miles on it.

First thing I did was run Sea Foam in the tank through the bike.

It was running okay, but there was some issues with it. One of which was a petcock that was seeping fuel through the spacer block and diaphragm. Also, there was a large crack in the air box which was letting in tons of unfiltered air.

Today, I rebuilt the petcock with all new O-rings and this cleared up the seep from before. There was a small drip of fuel coming from the outlets. Maybe the spring needs to be replaced also? On prime, it really flows though.

I also replaced the air box.

When I fired it up. I started to get fuel from the front of the carbs pretty heavily. I am sure I hooked up the hoses back correctly as I marked them. This had never happened before with this bike.

Is it possible that the mixture screws had been set to offset the amount of air from the cracked air box (main duct) and that's why the fuel overflowed? Or, do I now have a stuck float also?

Again, this had never happened before. So, all of a sudden a stuck float?

Thanks for any help guys!

Sincerely,
David
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post #2 of 40 (permalink) Old 09-26-2017, 08:01 AM
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Stuck float..BUT, you're saying from BOTH carbs?

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post #3 of 40 (permalink) Old 09-26-2017, 11:20 AM Thread Starter
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I think it was leaking from just the front of the carbs. So, that's the left?

Would Wolfie's method work on this potentially?
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post #4 of 40 (permalink) Old 09-26-2017, 12:43 PM
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Could be a stuck float. Try a few solid raps with a plastic screwdriver handle on the side of the bowl.

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post #5 of 40 (permalink) Old 09-26-2017, 12:46 PM
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Quote:
Originally Posted by magicdave2 View Post
I think it was leaking from just the front of the carbs. So, that's the left?

Would Wolfie's method work on this potentially?
would not hurt to try.

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post #6 of 40 (permalink) Old 09-26-2017, 02:08 PM Thread Starter
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Hey, good news! I found the source of the fuel leak. It is a one of the fuel hoses with a giant crack. I couldn't see it when the tank was in place. So, I placed the tank on loosely, fired it up and stuck a flashlight inside and you could see fuel pumping out of it.

So........any chance of replacing the hoses without pulling the whole carb out?

Thanks!
David
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post #7 of 40 (permalink) Old 09-26-2017, 03:51 PM
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as long as the fittings going into the sides of the carbs aren't bad, then yeah you can replace the fuel lines. Take the tank off and it should be a lot clearer how to access them. might be a bit of a struggle still if you have the stock airbox in place, but not impossible.

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post #8 of 40 (permalink) Old 09-26-2017, 04:28 PM Thread Starter
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Most of the lines look good actually. The problem was, the routing of that one line was rubbing against the hard edge of the top carb bowl and it finally just tore when I was moving them around to attach to the petcock.

Now, the issue is routing. Right now, the line is a little too tight and causing a restriction to the fuel. This is indicated by tilting the bike upright from the side stand and hearing the idle get stronger.

Are there any photos here of people's line routing?

Also, should the petcock nipples be aimed down; 45 degrees; 90 degrees; etc? for best fuel flow?

Thanks!!!
David
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post #9 of 40 (permalink) Old 09-26-2017, 08:32 PM
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on my petcock, stock, never molested to the best of my knowledge... one points down, one points up.. of course, the one that points upwards is the frontmost port.

I would say both angles are less than 45 degrees from horizontal

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post #10 of 40 (permalink) Old 09-27-2017, 08:05 AM
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Both of my petcock nipples (what a fun phrase) point directly horizontal towards the carbs
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