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Fuel leaking from drain valve.

This is a discussion on Fuel leaking from drain valve. within the Grizzly Engine & Transmission forums, part of the Grizzly Forums category; 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 ...


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#1
10-11-2012, 04:17 PM
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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#2
10-11-2012, 04:43 PM
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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#3
10-11-2012, 06:29 PM
Okay thanks, I guess I'll be taking it back apart!
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#4
10-12-2012, 08:11 PM
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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#5
10-13-2012, 10:30 AM
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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#6
10-14-2012, 10:15 AM
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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#7
10-16-2012, 07:28 PM
New needle and seat did the trick. Thanks for the replies
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