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Carburetors, Mixers, Fuel Pumps and fuel delivery Discussion about misc. carbs, mixers, fuel pumps, injectors.

Carburetors, Mixers, Fuel Pumps and fuel delivery

Holley 650 carb issues


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  #11  
Old 04-12-2016, 11:05:26 PM
G.M.Johnson G.M.Johnson is offline
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Default Re: Holley 650 carb issues

What kind of fuel pump are you running, old school mechanical or a electric? This problem reminds me of typical high fuel pressure or pressure regulator going bad. Anything over 6 psi is enough to give you fits. Just a thought.
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  #12  
Old 04-13-2016, 12:28:30 AM
uglyblue66 uglyblue66 is offline
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Default Re: Holley 650 carb issues

Mechanical on the side of the engine. We replaced it when we overhauled the engine.
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  #13  
Old 04-13-2016, 07:16:50 AM
MotorMike MotorMike is offline
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Default Re: Holley 650 carb issues

blue66 - Holleys are real easy to rebuild. Make sure you get a genuine Holley Renew kit, the blue gaskets are better. Flooding over is usually just crap in the needle & seat assy. Super simple to pull out & clean. Power valve diaphragm may have dried up and could be ruptured, replace with the correct vacuum rating for your application. If you tow alot use a lower power valve number. Once running set the air bleed screws with a vacuum gauge. Set both sides to the highest vacuum reading possible.
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Old 04-13-2016, 12:16:55 PM
ChipTosser ChipTosser is offline
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Default Re: Holley 650 carb issues

blue.
The Holley 650 duel line, 4777, 4776 series carburetor , manual choke, is very easy to work on.
As mentioned, if you have back fires on starting, the power valves will need replacement.
There should be two valves in the duel line carb.

If the valves are bad.
This will cause a very rich running and loss of fuel from the float bowl and inaccurate float level adjustment.

The one big issue that most people overlook, is the fuel pressure.

With fresh needle and seat, the fuel pressure for normal operations, should be in the range of 4 1/2 to a max of 6lbs.

Us your heat isolation plate and a large fuel filter. And do not over tighten the screws.
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  #15  
Old 04-13-2016, 01:23:27 PM
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OTTO-Sawyer OTTO-Sawyer is offline
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Default Re: Holley 650 carb issues

Personally I'd throw away or sell the damn Holley to someone else looking for a challenge and put the Tried and True Quadrajet back on it.

Yes, GM put Holley's on some of the Muscle Cars in the late 60s early 70s, but NOT because they were any better than a Quadrajet. They did it because the public that was in the market for those cars saw people running aftermarket Holley's on their race cars and THOUGHT Holley = Performance.

Truth is.... It's Hard to Beat a Quadrajet on a Street car or combination Street/Strip car ! They're Simple And Reliable ! (unless you got one that somebody already Screwed Up, and even then they aren't too hard to fix)

If you're running Wide Open at 7,000-9,000rpm & never have to idle or drive in traffic or pull a trailer then go with a Holley & custom tailor it to your application,
but for overall drive-ability, performance, and economy, stick with the Quadrajet and quit fighting with the aftermarket crap that doesn't hold up.
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Old 04-13-2016, 06:47:19 PM
ChipTosser ChipTosser is offline
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Default Re: Holley 650 carb issues

There's no challenge to it!

A holley is very basic, they are simple to work on.
They were installed on hundred of thousands of trucks, school buses, cars; over the years for that reason.

A quadrajet, has many parts that wear and are much more complicated to assemble, and set the metering rods and linkage for proper operation.

They are and where very expensive to rebuild, when replacing parts.

They also have all the same problems that any carburetor has. The quadra uses a different method of metering the air fuel. It is not as economical means of tailoring to the engine use.

Don't blame the screw driver, look at how it is being used.
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Old 04-13-2016, 09:17:21 PM
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OTTO-Sawyer OTTO-Sawyer is offline
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Default Re: Holley 650 carb issues

A $25.00-$35.00 Quadrajet rebuild kit (depending on where you get it from) isn't exactly an Expensive rebuild and they're simple as hell to work on.

Quadrajets outlasted several versions of fuel injection before they finally got engine management computers controlling enough parameters to get fuel injection working good enough to replace them.

But as you said:.... "Don't blame the screw driver, look at how it is being used."

I'd rather take a Quad and give it a $35.00 rebuild than spend $300.00 + buying a new Holley then spending more money on top of it buying the different jets and other parts needed to make it work on a particual engine set up only to have it blow out a power valve at the first little backfire.

Had an old crew-cab dually 4x4 with 4.10:1 gears in it that the previous owner had put a bigger cam in along with a Holley carb. Yeah, it ran OK, but I got tired of the 7mpg with it. Pulled off the holley and bolted on the Quad off of my jimmy and headed down the interstate on a road trip getting 11mpg at 80mph. Not incredible milage, but for an old 7400lb Crew-cab dually 79GMC full-time 4x4 with those gears and no overdrive I was happy with it.... especially compared with what it was getting before that.

Small primaries, HUGE secondaries, and being Vacuum secondaries it's damn near impossible to Over-Carburate as the air-doors only open as much as needed by the engine under any speed and load.

There's a reason GM stuck with them as long as they did even after using Holleys on a few models and however many different fuel injection set ups before they finally got that working good enough to retire the Quad.

But.... Kind of like the "Ford-v-Chevy-v-Dodge" or "John Deere-v-IH" arguments it all comes down to which is your favorite brand for whatever reason.

If you want to stick with the Holley, there's lots of good ideas posted on here on what it may need to fix your problem. If you want to go back to a Quadrajet you could pull one off an old station-wagon or most any other car or truck at the local junk yard and probably just bolt it on and run it for years and years with or without the $25-$35.00 rebuild.
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Last edited by OTTO-Sawyer; 04-13-2016 at 09:27:43 PM.
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  #18  
Old 04-13-2016, 10:34:23 PM
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Default Re: Holley 650 carb issues

UglyBlue66

Good luck on your project.

Otto!

I thought this was to give the guy help on his asked subject? I have given him pertinent information for his request.

You have high jacked his request with your opinion only. I can not help it if you have had bad results be cause of, what ever. You can use what ever you like.
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Old 04-13-2016, 10:38:47 PM
uglyblue66 uglyblue66 is offline
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Default Re: Holley 650 carb issues

Thanks for the ideas and help. I hope to get started on this problem saterday. We can't find a soul around here to work on the carb. I could send it off somewhere but I think since you have explained it aint hard, I will try it myself. My dad being 82 come june, I want him to drive this thing some and enjoy it. His dodge you all helped me on a while back crapped out it's transmission. Waiting to get it in the shop for that. I can't fix that so it will get farmed out .
I guess my gripe with quadrojets started when i was helping a friend with his motor home. 454,with a quad on it. constantly giving trouble.
throttle plates would hang on it for some reason,even though it had been worked on by a couple different folks. I finally theorized there was something warped on the intake causing it to get pulled out of shape when bolted down. It is not on the road any more so it don't matter.
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Old 04-13-2016, 11:01:58 PM
akuna akuna is offline
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Default Re: Holley 650 carb issues

Seriously no one in Concord can help? Get on Craigs list and ask for help from some hot rodders or find the preferred hot rod auto parts store and ask them. Or look online and search for car restoration and find someone that does hot rods.
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