Odd Holley Occurence
Thread Starter
Drifting
Joined: Oct 2007
Posts: 1,254
Likes: 5
From: Brown Summit North Carolina
Odd Holley Occurence
I test drove my 71 yesterday for the 1st time after reinstalling the motor.
I drove w/o hood or airfilter.
After getting home and parking the car, I heard a strange clicking noise every 4 to 5 seconds.
The noise was coming from the carb.
Every time it would click , a small spray of fuel squirted from the squirter nozzels.
As the car cooled down, the gas stopped, but the clicking continued and then it stopped.
I called Holley today, and the tech right a way said the fuel cap was not venting.
My car has a sealed cap and a vented tank. I had the tank out 3 years ago and cleaned it. I would be surprised if the vent is clogged.
The next time I drive the car, I will remove the cap after I park it, to see if this makes a difference.
Anyone have any other sugestions?
Lastly, can you run a vented cap if the vent is the issue.
David
I drove w/o hood or airfilter.
After getting home and parking the car, I heard a strange clicking noise every 4 to 5 seconds.
The noise was coming from the carb.
Every time it would click , a small spray of fuel squirted from the squirter nozzels.
As the car cooled down, the gas stopped, but the clicking continued and then it stopped.
I called Holley today, and the tech right a way said the fuel cap was not venting.
My car has a sealed cap and a vented tank. I had the tank out 3 years ago and cleaned it. I would be surprised if the vent is clogged.
The next time I drive the car, I will remove the cap after I park it, to see if this makes a difference.
Anyone have any other sugestions?
Lastly, can you run a vented cap if the vent is the issue.
David
Melting Slicks
Joined: Feb 2006
Posts: 3,428
Likes: 5
From: Japan
I had this happen with a Holley spreadbore on mine some years ago. The carb was a used/rebuilt unit, I never could get it to stop. Best I could surmise it was literally siphoning gas from the tank and the needles and seats weren't closing well enough to stop it. It had non-externally adjustable floats so I had to keep pulling the bowls to try and float-adjust it out, after several tries I just gave up and put the (semi-) trusty old QJet back on. Never did get to the bottom of it and I haven't yet seen a conclusive thread post on this greatest of all car forums to get to the bottom of exactly what was causing it...grrrr.
Melting Slicks
Joined: Mar 2009
Posts: 3,126
Likes: 15
Fuel percolation. I installed a Holley Street Dominator intake, 3310 carb. with Holley chrome air cleaner on my '77 L82 back in the day. Was in the summer time in Dallas. Pulled in to stop and same thing as yours happened. The heat from the Vette engine compartment, Dallas summer, aluminum intake, non blocked heat cross over and running it hard led to boiling the fuel. I ran the same exact setup on my '74 Z28 and never had this happen. I blocked the heat crossover at the intake gasket with the little metal plates, Mr. Gasket and installed an insulator under the carb. where you have a gasket, aluminum plate, gasket, aluminum plate, gasket, with about six layers. I never got it to completely stop on those 105 degree days but it did much better. I think this is what you are seeing. Good luck with it, mike.
I would like to know if anyone else knows if this will occur with a Q-jet on an aluminum intake with the crossover not blocked. I still have the polished
Holley intake.
I would like to know if anyone else knows if this will occur with a Q-jet on an aluminum intake with the crossover not blocked. I still have the polished
Holley intake.
Last edited by mds3013; Apr 25, 2011 at 11:15 PM.
Burning Brakes
Joined: Jan 2007
Posts: 1,057
Likes: 4
From: Concord Calif
I had a similar problem with a vented cap that vented to wrong way for my car(68). It would vent in as fuel was used but would not vent out when stopped and heat built up. This would push fuel into the engine. Be sure you a the correct vented direction cap!
