but in the same vein it sounds like some trash got in the needle and seat. You may want to check that out.simple fix.
Holley 750 Problem
Thread Starter
Pro
Joined: Oct 2000
Posts: 558
Likes: 22
From: Vancouver, B.C., Canada
Holley 750 Problem
Big block has rough idle. Found gas dripping down primary, at idle, onto the throttle blades. Carb rebuilt last year and has been running great until now. I'm assuming a gasket has let go? Any ideas? Model is 4160.
Last edited by Kim72; Feb 16, 2016 at 07:29 PM.
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Even with a blown power valve, fuel will not drip from the boosters at idle. There's not enough pressure differential in the booster for that to happen. It will run down the vacuum port in the PV depression and drip without any external clues.
Unless you fiddled with the float, the level isn't likely to have changed. You have debris in the needle/seat assembly or your float is sinking.
Unless you fiddled with the float, the level isn't likely to have changed. You have debris in the needle/seat assembly or your float is sinking.
Thread Starter
Pro
Joined: Oct 2000
Posts: 558
Likes: 22
From: Vancouver, B.C., Canada
Fixed it!! Took the primary bowl off and cleaned everything. Put it back on and it's running great again. No fuel dripping, good idle. You we're all right. I assume it was trash in the needle/seat.
Thanks to all.
Thanks to all.
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Melting Slicks
Joined: Feb 2006
Posts: 3,105
Likes: 96
From: Sunrise FL
If the problem comes back...make sure the floats are the metal ones. The nitrofil (plastic) floats can absorb fuel, and sink, especially when hot.
If your rubber fuel lines are old, they can be breaking down from new ethanol fuels.
If your rubber fuel lines are old, they can be breaking down from new ethanol fuels.