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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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  #1  
Old 04-12-2016, 12:22:37 PM
uglyblue66 uglyblue66 is offline
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Default Holley 650 carb issues

A couple questions but first let me explain the story.
Carb is a 4160 4 barrel 650 cfm holley. Truck has 2 fuel filters.New sock in gas tank and tank was clean as a whistle and still is
I helped my dad with getting the 350 and transmission overhauled for his 1970 Chevy pickup back in 2013.
It had a quadrajet on it and I suggested changing to a holley. I got a used carb and a kit and we had someone fix it for us and put it on. It ran "ok" till about 4 months ago.It got hard to start and did not idle right.
This truck has not had ethanol fuel in it since the overhaul. 91 octane non ethyl only. Unless the pumps were miss marked.
Well it got to the point fuel was coming out around the throttle shafts. I adjusted the floats by the instructions on the paper work that came with the kit..It ran great for the test drive and we was happy. Next day, went back to it's old self.
It also needs the base leveled up. for whatever reason it has warped and has a gap between the base and gasket. There is a machinist local I can take the base to and have it leveled on a digital bridgeport.
But my questions are,Would both floats go out at the same time? I can see 1 going out and letting fuel around the shaft but both?
Can I overhaul this carb? I have done tractor carbs for years and did 1 for a ford pinto and other stuff,but this kit diagram looks complicated.

Does anyone have pointers or ideas of what could cause it to flood if the floats are not bad?
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Old 04-12-2016, 01:31:35 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Holley 650 carb issues

Some of the Holleys had an equalizer tube between the front and back bowls, this would let one flooding bowl feed the other. If you have trash in the needle and seat you can remove it without disassembling the carb, blow it out and reset the floats.
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Old 04-12-2016, 02:04:08 PM
edward moller edward moller is offline
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Default Re: Holley 650 carb issues

holleys have a bad problem with ruptured power valve diaphragms, it it ever backfires one time it will rupture the power valve allowing fuel to run into the engine,set the floats with the level screws out of the bowl, with the engine running. till it is just below the bottom of the hole.
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Old 04-12-2016, 02:12:26 PM
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FWurth FWurth is offline
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Default Re: Holley 650 carb issues

Have those damn Hollys on our old grain trucks, always problems. bought a new one and worked ok for a year then would fill up the oil pan with raw gas, replaced it with another new one as the supplier informed me that they had a bunch of recalls. The new one also had the same issue after a short time, finally gave up with the new ones and found an old one that so far is working. One truck here has a Eddlebrock on it and that one seems to not have problems so far. We worked on those Hollys and replaced almost every thing in them, including the power diaphragm but no change, and could never get them to not flood over. Even replaced the fuel pump as that was thought to be the issue but not. I still believe that this was the main reason every one went to fuel injection.
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Old 04-12-2016, 03:54:39 PM
akuna akuna is offline
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Default Re: Holley 650 carb issues

Sounds like it needs a spacer to keep the heat from the intake away from it.

My guess anyway. It should not warp the base unless there are heat or mechanical issues like it not fitting the manifold or over tightened bolts?
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Old 04-12-2016, 06:47:35 PM
mmcdonald mmcdonald is offline
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Default Re: Holley 650 carb issues

The equalizer tube is a good tip. Highly unlikely brass floats bad at same time but if you have the foam floats its theoretically possible they soak up gas relatively equally thus both sinking at the same time. Only way to know if the foam floats soaked up gas is to weigh them against a known dry float. You are probably capable of cleaning the carb although it is a PITA in my opinion unless it's just fuel residue. If it's corrosion that needs cleaning that makes it a VERY involved cleaning especially on the metering blocks. If the checks in the pump circuit are not working that will cause it to flood or run rich(along with the power valve as mentioned). Most common kits seem to still be using buna for everything which does not stand up to fuel like it did in the past. The green flouroelastomer which you can get for the pumps is great, but I'm not sure if you can get the power valves with that material. The warpage on the base plate is most likely from tightening or gasket swell and is very common. If it's minimal a surfacing will do but if severe you can heat it up and press on flat surface to take out the majority of it before surfacing. The more material you remove the more prone it will be to warpage. Just my 2 cents. Good luck.
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Old 04-12-2016, 08:22:52 PM
Greg Mosley Greg Mosley is offline
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Default Re: Holley 650 carb issues

Just a thought. Holleys are a Zimak material and are more prone to warping. Edelbrock units are aluminum. Put a phenolic spacer to rid the heat. This is a truck and it runs hard which produces high levels of heat within the valley. Metering blocks will also warp. One other issue is probably owner error. Overtightening the air cleaner. This distorts the carb also. Enuf Said.
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Old 04-12-2016, 10:34:27 PM
uglyblue66 uglyblue66 is offline
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Default Re: Holley 650 carb issues

I will check for a equalizer tube. It leaks more from the back than the front.


I actually bolted the carb on the truck. there is a adapter plate to help the holley fit. Some folks don't like that idea but it was what we were told was the best option at the time.So the carb is already lifted up from the intake a good bit by that aluminum adapter.
I don't recall tightening the bolts that much. I was already aware of the issues of over tightening from the work I did on my Tbird years ago.It had been over tightened to the point of breaking the ears off the carb! Cost me a good bit to get that fixed.
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Old 04-12-2016, 10:43:33 PM
akuna akuna is offline
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Default Re: Holley 650 carb issues

Put a rotenchester back on it, or a Edelbrock.
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Old 04-12-2016, 11:04:23 PM
uglyblue66 uglyblue66 is offline
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Default Re: Holley 650 carb issues

I have been hearing from a couple friends about a Quick Fuel carb that looks like a Holley but is supposed to be better?
The quadra crap that was on the truck was a gummy mess after sitting 12 years. I talked to some folks about it and they said it had check balls and such in it that were a pain to deal with.
I was skeered of it in other words.
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