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Old 07-16-2008, 06:08 AM
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Gasoline bubbling in float bowl?

Hoping someone can shed some light on what might be causing me some grief with my Edlebrock carboretor. I have it on a 350 chevy motor with headers. Problem is when on incline or decline motor wants to flutter and acts like it is starving for fuel. So I drove it to my buddy's house 6 miles away and then we pulled the top of the carb off to find the gas in the float bowls bubbling mainly out of the jets however there was some bubbling on the side of the bowl as well? Can anyone shed some light on this for me?

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Old 07-16-2008, 07:50 AM
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Welcome to Hotrodders....this is the Introduction forum so you need to post your question over in the Engine forum...that way it will be seen by the the folks with the answers.
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Old 07-16-2008, 08:12 AM
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moving it........
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Old 07-16-2008, 09:00 AM
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I had an edelbrock AVS thunder carb and also a 1406 that did the same thing... I wasnt sure what was going on and ended up buying a holley.. but come to find what I really couldve done was put a carb spacer / heat insulator plate between the carb and intaks.. my aluminum performer RPM intake was transferring a lot of heat to the carb causing it to boil the fuel out into the intake.. consequently when id go to start id have long crank times as the bowls were empty.... the same carb i though was bad on another guy's car using a spacer is working perfectly...
-Christopher
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Old 07-16-2008, 09:46 AM
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Thanks for the input. I will give that a shot and see if it works. Makes perfect sense as I also am getting long cranks before it starts after it's warmed up. I will be sure to post back my results!!
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Old 07-16-2008, 08:07 PM
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I read on here somewhere that the Edelbrock performers/RPMs manifolds need the exhaust crossover restricted because they overheat the carbs. A spacer would help too. Wood or Phenolic.
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Old 07-17-2008, 06:40 AM
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I agree on the exhaust crossovers.. however mine still did it with the crossover blocked.. i dont see the need to have the crossover open on non-smogger cars.. i think it just creates vapor lock issues.. definately go with a spacer if you have the room under the hood to get one in.. and like the last post stated.. NOT an aluminum spacer... depending on whether you want to re-tune or not you will want to make sure you get a spacer that keeps you as running dual plane.. or you can get a single hole spacer.. however you may need to re-tweak your tune if you have a dual plane intake and go t oa single hole spacer...

-CHristopher
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Old 07-17-2008, 01:43 PM
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Yes, a heat spacer will help. However, the root of the problem is the carb material. Edelbrock/carter carbs are made of the wrong material for a carb (aluminum) which makes them extra sensitive to heat which causes them to bubble fuel. They say their carbs cool down faster (which is true), but they forgot to mention that they also heat up quicker too.
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Old 07-22-2008, 09:16 AM
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Thanks to all that posted information for me. I ended up buying a Edelbrock 1" spacer/insulator part number 8710. Put it on and headed for the dunes. She ran GREAT ALL THE POWER I need. Can't never have enough power though. Silver Lake is no match for the CJ-5 Jeep and it's Chevy 350 heart.
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