Join Date: Aug 2002
Location: Albuquerque, NM
Re: Holley 4160 rough idle
I found out that that part is called a vent baffle. It helps prevent fuel from getting up into the vent tube.
Okay, I'm totally stumped. I took the needles out and cleaned them (without taking off the float bowls) and it started up. I adjusted the float levels, and idle mixture. It ran fairly good for about a day. Then it started up rough, ran for a few minutes and then died. Fuel was leaking out underneath the vacuum secondary diaphragm area. I haven't been able to start it since.
I then took float bowls and metering blocks off, cleaned everything off with carb cleaner. I hosed off the main section (including air bleeds). I did notice a nick in the front needle gasket (so I replaced the gasket). I put the secondary sealing plate on when I was putting it back together. It still won't start, and fuel is leaking out in the same place, and fuel is blub-blubbing out still (from the transition slot on the secondaries).
I called Holley in between tear-downs and they said that fuel leaking where it's at is either too much fuel pressure, incorrect float levels, or gunk in the needles/seats. My fuel pressure is 7psi (they recommend 6-7), and my float levels are correct.
Any suggestions? Thanks.
1968 Camaro, 383 with Dart Pro 1 aluminum heads and roller cam, Holley Sniper EFI with Dual Sync distributor, Muncie M21 4-speed transmission, 3.73 12-bolt Eaton posi differential.
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