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Old 07-23-2013, 10:04 PM
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Fuel leaking from under nozzle in carb

Hi all,
New here and found this forum trying to find a solution to my problem. Hopefully I found the right place :-)

I have a ProForm (Holley) 750 on a 455 in my 66 GTO and noticed the front nozzle leaks fuel from under the nozzle where the washer is. I only noticed it when trying to find the cause of flooding. Once my car gets around 210 its not long before it floods out, I know its weird, but it seems to never do it until the temp is 200-210, not before.

I reset the float to the very bottom of the plugs. It was a little high so I thought it couldn't hurt. I also replaced the washers again. It is still leaking fuel, a nice steady steam comes out. I don't see any cracks in the nozzle, new washers, correct float level, I'm out of ideas :-( I have the fuel pressure set to 4.5 PSI.

I'll also note that when going into 2nd gear it seems to fall flat on its face, definitely not pulling like it should. Sounds and feels like too much fuel. If I go into 2nd easy and ease on the throttle its fine. I was thinking this was related to the first problem, but if not it might help someone point me in the right direction. But I usually can't go more than 30 minutes without it flooding out.

Any ideas what I can try?

Thanks!

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Old 07-24-2013, 10:42 AM
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Anyone?
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Old 07-24-2013, 11:00 AM
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you may have a faulty needle and seat- it would explain flooding but not a temp coincidence.

your fuel pressure is a hair low too, do you have a more than adequate fuel pump? If it pulses then that can play hell with the needle and seat.
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Old 07-24-2013, 12:07 PM
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I have a high flow electronic pump. It is loud and does make some pulsing sound. But I thought it was normal sound of operation.
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Old 07-24-2013, 12:09 PM
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Quote:
Originally Posted by 6T6GTO View Post
Hi all,
New here and found this forum trying to find a solution to my problem. Hopefully I found the right place :-)

I have a ProForm (Holley) 750 on a 455 in my 66 GTO and noticed the front nozzle leaks fuel from under the nozzle where the washer is. I only noticed it when trying to find the cause of flooding. Once my car gets around 210 its not long before it floods out, I know its weird, but it seems to never do it until the temp is 200-210, not before.

I reset the float to the very bottom of the plugs. It was a little high so I thought it couldn't hurt. I also replaced the washers again. It is still leaking fuel, a nice steady steam comes out. I don't see any cracks in the nozzle, new washers, correct float level, I'm out of ideas :-( I have the fuel pressure set to 4.5 PSI.

I'll also note that when going into 2nd gear it seems to fall flat on its face, definitely not pulling like it should. Sounds and feels like too much fuel. If I go into 2nd easy and ease on the throttle its fine. I was thinking this was related to the first problem, but if not it might help someone point me in the right direction. But I usually can't go more than 30 minutes without it flooding out.

Any ideas what I can try?

Thanks!
I'm not sure what you mean by "nozzle" is this where the fuel line connects to the carb or are you talking about a boost venturi in one of the primary ("front") venturies?

Proform is a Chinese Holley clone, not a real Holley.

Bogie
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Old 07-24-2013, 12:30 PM
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Hi, sorry, I'm not sure what thy are called. Maybe jets? They have 2 holes that squirt fuel into the 4 big holes. One in front, other in the back.
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Old 07-24-2013, 01:38 PM
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THose are called boosters. If it's leaking fuel it's flooding. Maybe 2 high of fuel pressure, a high float level or since it does it when the temp of the motor hits 210 then the fuel is starting to boil in the bowl.
You need a spacer to isolate your carb from the manifold or even a heat plate to keep the heat from the bowls.
Here's some heat plates.
http://www.ebay.com/bhp/holley-heat-shield

And some ideas for spacers.
http://www.ebay.com/bhp/1-2-carb-spacer
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Old 07-24-2013, 02:15 PM
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I think you are talking about the squirters. They have small gaskets under them. If I let mine sit for a few weeks they start to leak.
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Old 07-24-2013, 10:28 PM
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Here is a pic pointing to the thing I am talking about. It leaks from the bottom of it where the washer is. I have even replaced the washer.

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Old 07-24-2013, 10:37 PM
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Yes those are the squirters technically called discharge nossles. There should be a gasket under there not a washer.
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Old 07-24-2013, 10:43 PM
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Sorry, I suppose it is a gasket. But thought of it as a washer. I bought the rebuild kit and didn't see any that were the exact same thickness as what was in there before. Same material, but about half as thick. I just don't understand how any fuel can get past it. I even tried to double them.

I should note this was on the car when I bought it, so I'm not even sure if the correct gasket/washer was in there to begin with. So I don't know a whole lot about this carb. The exploded view diagram I seen I couldn't find a thickness or even what type it is.
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Old 07-24-2013, 10:49 PM
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Is any fuel coming out of the squirters? Do the accelerator arms move correctly?
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Old 07-24-2013, 11:07 PM
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Yes, fuel comes out of them just fine. I've made sure its clean and not clogged. As for the arm, you mean the one in the upper left of my pic with the red spring on top? Id so, yes, it seems to move fine.

P.s. Mine does not have that thing on the right side of the picture.
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Old 07-24-2013, 11:44 PM
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Yes that is the arm. This seems kinda strange but I would just replace the squirter it may has a crack u can't see they are just cast pot metal. Also if u can post some pics of those gaskets u have I can compare them to mine and see if they correct. I can get u a part number for them also
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Old 07-24-2013, 11:49 PM
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Also does the squirter screw look correct?
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