Fuel leaking from drain valve. - Yamaha Grizzly ATV Forum
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post #1 of 7 Old 10-11-2012, 04:17 PM Thread Starter
 
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Fuel leaking from drain valve.

Hi,
My 2004 Grizz 660 is leaking out of the fuel bowl drain plug. I've recently had the fuel bowl off and replaced the o-ring and bolts (messed them up getting them out). Now it's leaking out of the fuel drain plug hose. I've opened the drain plug, and tightened it up again pretty snug and it continues to leak. I haven't removed it all the way. Is there an o-ring on the drain plug that goes bad?
Thanks!
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post #2 of 7 Old 10-11-2012, 04:43 PM
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The drain also functions as a float bowl overflow. You have trash stuck in the needle and seat or the needle and seat are bad or the float level adjustment was altered when you had it apart.

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post #3 of 7 Old 10-11-2012, 06:29 PM Thread Starter
 
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Okay thanks, I guess I'll be taking it back apart!
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post #4 of 7 Old 10-12-2012, 08:11 PM Thread Starter
 
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I took the carb apart today and it looks like the O-ring around the needle seat is pretty brittle and worn out. Could this lead to the fuel bowl over flowing?
Time for a rebuild?
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post #5 of 7 Old 10-13-2012, 10:30 AM
 
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yeah if the o-ring is bad gas will flow around it causing it to overflow. atleast thats what i gather from researching it the last few days. mine is still down with carb issues.
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post #6 of 7 Old 10-14-2012, 10:15 AM Thread Starter
 
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Thanks, I picked up a new needle and seat assembly from the local yamaha dealership for 22 bucks. Should take care of the issue.
On another question: I installed a weisco piston and mud buster cam last year. Should I change the jet size in the carb?
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post #7 of 7 Old 10-16-2012, 07:28 PM Thread Starter
 
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New needle and seat did the trick. Thanks for the replies
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