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Old 05-03-2008, 06:21 AM
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AED (holley) carb issue

I got a problem with the primary side accelerator pump shot for some reason the shot seems to be sucking air from somewhere?
another words its got air in the fuel and its not a solid stream?
So now I got a hesitation just off idle
Btw I changed the pump diaphram too and still no good.
750 D/P 4150 holley
I changed gaskets aswell
I was also wondering which accel pump cam would work.
I got a multitude of different ones (I got the cam kit years ago)
anyone know the rates they put out?
I need a high initial pump shot
im also running 3.7 shooter which was changed from a 3.5.
I ran a different carb (old BG 750) and issue went away.

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Old 05-03-2008, 06:59 AM
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holley problems

Hey did you check the accelerator pump check valve if it is not working you will see the same symptoms.
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Old 05-03-2008, 07:38 AM
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the check (rubber umbrella seal looks good)
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Old 05-03-2008, 08:00 AM
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Two other things, is the return spring is on top of the accl. pump diaphram and have you pulled the squirter to see if the upper check valve is free and sealing corectly? I would look at those and if they are OK pull the float bowl and metering block and make sure the gaskets are sealing OK on them.
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Old 05-03-2008, 10:35 AM
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ok I found the problem
small crack (hairline crack) on the accel pump housing in the fuel bowl.
swapped with a good used bowl problem went away.
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Old 07-03-2008, 09:35 AM
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AED Carb Issue

I just bought an AED 750 HO, this think sucks bigtime.
Looks like they took a Holley 4777 double pumper and milled the choke housing. My Mustang lost over 3 seconds in the 1/4 mile.

I tired getting CNC Motorsports to refund the cost, but they gave me a royal run around and will not give my money back.
I recommend not using either one of these companies..........

I bought a 750 Proform and the car has never ran better..........

Good luck if you have an AED Carb....
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Old 07-03-2008, 10:17 AM
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Quote:
Originally Posted by camman1967
I just bought an AED 750 HO, this think sucks bigtime.
Looks like they took a Holley 4777 double pumper and milled the choke housing. My Mustang lost over 3 seconds in the 1/4 mile.

I tired getting CNC Motorsports to refund the cost, but they gave me a royal run around and will not give my money back.
I recommend not using either one of these companies..........

I bought a 750 Proform and the car has never ran better..........

Good luck if you have an AED Carb....
Did you tune the carb for your engine, or just run it right out of the box?
What is the specific problem? What did you try for tuning?

You say Proform is OK, Maybe a Demon or Edelbrock AVS would be even better.

Just making a statement here, not an attack.
Most hot rodders keep changing carbs until they find one that works right out of the box because they can't tune them. And then it is the manufacturers' problem they got all the bad carburetors. Not being able to tune a carburetor is not grounds for refund.

Calling and ordering a carb from a carb specialist so they can build it for your combination has its merits.

Last edited by ScoTFrenzel; 07-03-2008 at 10:23 AM.
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Old 07-03-2008, 10:20 AM
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I have an AED I got directly from them that was tuned by AED for my engine and I couldnt be happier. Havent had to touch it.
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Old 07-04-2008, 09:41 AM
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hmm AED sent me a brand new carb even before I returned the old one.
Nice guys actually (if you dont go off half cocked)
they even gave me a carb that was more expensive than the 750 HO
put it on made some adjustments and it runs great now as far as induction is concerned.
after my carb was returned they found the problem.
when i got the carb the first time the box was beat up and the UPS guys dropped it in transit.
bent shaft was the problem
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