Holley acc pump issue.
#1297180
09/04/12 12:35 PM
09/04/12 12:35 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
OP
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OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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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.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Holley acc pump issue.
[Re: dartman366]
#1297183
09/04/12 02:19 PM
09/04/12 02:19 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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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.
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Re: Holley acc pump issue.
[Re: CHAPPER]
#1297185
09/04/12 02:55 PM
09/04/12 02:55 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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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.
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Re: Holley acc pump issue.
[Re: dartman366]
#1297186
09/04/12 04:07 PM
09/04/12 04:07 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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is the check needle under the squirter?
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Holley acc pump issue.
[Re: 383man]
#1297188
09/04/12 06:27 PM
09/04/12 06:27 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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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"
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Re: Holley acc pump issue.
[Re: TRENDZ]
#1297189
09/05/12 03:56 AM
09/05/12 03:56 AM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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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.
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