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Holley acc pump issue. #1297180
09/04/12 12:35 PM
09/04/12 12:35 PM
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366 Offline OP
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Mt. Vernon, Ohio
been helping a friend get his 70 AAR cuda running better, 6 pak is long gone and has been running a single 4 on it, he had a Edelbrock carb on it for a while, ran good but was a real bear to start after running it for a while, so switched to a Holley 650 dp he got from a friend, car ran, idled, and started much better after the swap but had a noticable stumble when you took off from a stoplight or anything, so we did the normal squirter swap,,nothing, changed the pump diaphragm,, nothing, even pulled it apart and checked the gasket and cleaned the circuit,,nothing what I did notice was when you give it a little throttle no gas came from the squirter untill you gave it more throttle so i took the squirter out and moved the throttle just a little and gas would come up in the main body but as soon as you released the throttle the level would drop as if it is draining back leaving a air gap between the main body and the squirter, so I put in a new check needle below the squirter and nothing,,all that I can think of is the check needle seat is mis machined or damaged(how I don't know) in the main body, can this be fixed or is it time for a new body? other than that the carb works excellent.


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Re: Holley acc pump issue. [Re: dartman366] #1297181
09/04/12 01:04 PM
09/04/12 01:04 PM
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Taxes & Virus's R-US, NY
Dragula Offline
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Sounds more like the lever arm that engages the squirter is not adjusted correctly. Set the squirter arm to the adjustable bolt so that it barely touches or has a .004" gap, no more. Its the bolt that has a spring on it, and uses a 3/8" open end on both ends of it to adjust. Do the back one as well.


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Re: Holley acc pump issue. [Re: Dragula] #1297182
09/04/12 01:48 PM
09/04/12 01:48 PM
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366 Offline OP
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Mt. Vernon, Ohio
adjuster arm has been set and re set two different ways with the arm just barely touching and approx .015 clearance (additional travel) before bottoming out at full throttle, niether way had any effect, just don't understand why it bleed's back.


Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
Re: Holley acc pump issue. [Re: dartman366] #1297183
09/04/12 02:19 PM
09/04/12 02:19 PM
Joined: Jan 2003
Posts: 27,421
Balt. Md
3
383man Offline
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Balt. Md
Did you check the inlet check valve ? It is usually the flat red rubber type in the bottom of the carb under the pump. I only ask because to me when you have the pump discharge ball or weight in the circuit it will drop as soon as the pump stops to keep fuel right there and then the inlet check valve should open and let fuel in the circuit to keep a full and ready pump shot. Then of course the invlet valve should seat and seal so it has a full shot of fuel in the pump circuit. Ron
.

Last edited by 383man; 09/04/12 02:20 PM.
Re: Holley acc pump issue. [Re: 383man] #1297184
09/04/12 02:39 PM
09/04/12 02:39 PM
Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
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CHAPPER Offline
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Belpre,Ohio
Quote:

Did you check the inlet check valve ? It is usually the flat red rubber type in the bottom of the carb under the pump. I only ask because to me when you have the pump discharge ball or weight in the circuit it will drop as soon as the pump stops to keep fuel right there and then the inlet check valve should open and let fuel in the circuit to keep a full and ready pump shot. Then of course the invlet valve should seat and seal so it has a full shot of fuel in the pump circuit. Ron
.




Make sure the rubber is laying flat and not dried/wrinkled up some. Also, the squirter check seat can be possibly straightened up with a small pin punch, set on top of the check needle, and then tapped with a hammer.


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Re: Holley acc pump issue. [Re: CHAPPER] #1297185
09/04/12 02:55 PM
09/04/12 02:55 PM
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366 Offline OP
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Mt. Vernon, Ohio
It's the older style check ball in the acc pump, wish it was the newer umbrella style as those are known to be quicker responding, thanks Fred I may look into that, got nothing to loose.


Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
Re: Holley acc pump issue. [Re: dartman366] #1297186
09/04/12 04:07 PM
09/04/12 04:07 PM
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Posts: 9,225
Charleston
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sixpackgut Offline
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Charleston
is the check needle under the squirter?


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Re: Holley acc pump issue. [Re: dartman366] #1297187
09/04/12 05:37 PM
09/04/12 05:37 PM
Joined: Jan 2003
Posts: 27,421
Balt. Md
3
383man Offline
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Balt. Md
Quote:

It's the older style check ball in the acc pump, wish it was the newer umbrella style as those are known to be quicker responding, thanks Fred I may look into that, got nothing to loose.




Wow it seems every Holley I look at anymore has the newer umbrella type. Sorry I forgot about that. Ron

Last edited by 383man; 09/04/12 05:38 PM.
Re: Holley acc pump issue. [Re: 383man] #1297188
09/04/12 06:27 PM
09/04/12 06:27 PM
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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TRENDZ Offline
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Milwaukee WI
Did you check the bowl/ metering block gaskets? There isn't a whole lot of surface there.


"use it 'till it breaks, replace as needed"
Re: Holley acc pump issue. [Re: TRENDZ] #1297189
09/05/12 03:56 AM
09/05/12 03:56 AM
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366 Offline OP
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dartman366  Offline OP
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Mt. Vernon, Ohio
Yep check needle is there, I replaced it with a new on that I had,,gaskets all looked good as far as sealing but I replaced them anyway.


Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
Re: Holley acc pump issue. [Re: dartman366] #1297190
09/05/12 10:11 AM
09/05/12 10:11 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Romeo MI
What size squirter did you go to

Re: Holley acc pump issue. [Re: MR_P_BODY] #1297191
09/05/12 01:00 PM
09/05/12 01:00 PM
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366 Offline OP
I Live Here
dartman366  Offline OP
I Live Here

Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
Quote:

What size squirter did you go to



it had a 25 we went to a 28 then 31 then 35 didn't change it always has to be pumped once before it shoots as if it's bleeding the fuel back and need's to be pumped back up to the squirter, I think it a bad seat in the main body thats allowing gas to bleed back and leaving a air pocket at the squirter.


Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.






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