Carburetor Leaking Fuel Out Drain Tubes? - Yamaha Grizzly Forum : GrizzlyOwners.Com Yamaha Grizzly Forums
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post #1 of 13 (permalink) Old 04-15-2007, 10:22 PM Thread Starter
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Carburetor Leaking Fuel Out Drain Tubes?

Finished my ride today and loaded the 2003 Grizzly on the trailer. I soon noticed fuel coming out of carburetor drain tube. The fuel **** was off but it would not stop. I moved the end of the hose to a point above the fuel tank and in a minute fuel started coming out of another drain hose that connects to the carb a little higher up. I think that hose is the "Vacuum chamber breather hose" but am not sure. I raised the second tube as high as I could but eventually it starting coming out again. This leads me to a few questions:

1. Can I assume the fuel **** valve is broken and needs to be replaced?
2. Why did the carb float not stop the fuel from flowing?
3. By raising the end of the hoses to a point above the carb did I force gas to leak into the cylinder or engine?

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post #2 of 13 (permalink) Old 04-16-2007, 11:00 AM
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Check the vent hose on your gas cap. My was plugged once and it did the same thing you're describing.

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post #3 of 13 (permalink) Old 04-16-2007, 12:27 PM
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Once fuel line was shut off it should have stopped leaking if shut off was working properly (very soon). Sounds also like needle/seat issue. Pretty easy fix. I've always replaced those parts when encountering this issue (small price) but someone on here said you can fix the problem most of the time by "cleaning" needle with fine steel wool. Best of luck.

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post #4 of 13 (permalink) Old 04-16-2007, 12:38 PM Thread Starter
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GrizzlyGanz, I checked the vent hose when I got home and it was clear.

rentalrider, do I need to remove the fuel tank to replace the fuel shutoff and change the needle.

Thanks

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post #5 of 13 (permalink) Old 04-16-2007, 04:56 PM
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The needle and seat is in the carburator... fuel shut off petcock is under tank, before carb. totally unrelated issues. That's the bad news. Good news is that neither problem is typically difficult to fix. And whenever I've changed fuel shut offs (never on a griz for the record) I've had to drain but never remove the tank.

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post #6 of 13 (permalink) Old 04-16-2007, 05:23 PM Thread Starter
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Because the carb kept leaking after I shutoff the valve I have to assume both parts need fixing. Draining the tank will not be an issue as it self drained itself.

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post #7 of 13 (permalink) Old 04-17-2007, 01:13 AM
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First of all I think there is more fuel in your carb than you realize. It sounds like your float is stuck. If you have someone help you you can hold the rear brake and lift the front of the Griz in the wheelie position. Then let the front wheels drop. This may jar the float loose.

From a place you cannot see comes a sound you will never hear.

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post #8 of 13 (permalink) Old 04-17-2007, 01:51 AM Thread Starter
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Thanks Starsky but it leaked at least 2 gallons so that rules out the carb only. Good idea on shaking the float loose. If it happens again I will try that technique. I think I will take this opportunity to take the carb out and give it a good cleaning and replace any worn parts. Better now than deep in the woods.

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post #9 of 13 (permalink) Old 04-18-2007, 10:52 AM
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I would have to agree, I don't think the carb holds 2 gallons of fuel. Good luck and let us know what you find out.

From a place you cannot see comes a sound you will never hear.

05 Woodland Grizzly with 26" Dirt Devils on black ITP C series Type 4, 2.5 Warn winch, stock exhaust, K&N filter w/ Pro Design flange, Overfenders and EPI Sport/Utility clutch. ADB Tracks for winter drift busting. Sold but lives across the street.

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post #10 of 13 (permalink) Old 04-25-2007, 03:38 PM Thread Starter
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I hate when guys ask good questions and then never come back to explain what the result was so here goes.

I found a small piece of black rubber stuck in the float valve. The needle could not seat properly. It was part of the shutoff valve that broke free and floated down stream until it got stuck. The shutoff valve was shot but the needle and seat were fine once the piece was removed. I have since added a fuel line filter between the shutoff valve and the carb. I do not understand why a filter is not a stock part on the Yamaha ATVs.

Thanks all for your help.

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