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1
Quadrajet Carb Talk and Tips / Re: What would be a good carb for my build?
« Last post by taguy4 on July 08, 2025, 08:56:01 PM »
I have the book on order.
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Quadrajet Carb Talk and Tips / Re: Quality, reliable mechanical fuel pumps
« Last post by quadrajam on July 08, 2025, 04:59:07 PM »
What does a choke indicator light do....????
I used the original key-on wire for the v6 distributor to power up the v8 HEI distributor,
electric choke and at times a fast idle solenoid. plenty of voltage for all 3.
Fuel pump is another circuit that goes through the oil pressure switch. There is no automatic
prime. I have a button on the dash for that.
Should take very little current to power a relay and choke heater....

QJ
3
Quadrajet Carb Talk and Tips / Re: Quality, reliable mechanical fuel pumps
« Last post by quadrajam on July 08, 2025, 01:35:32 PM »
Cadman, check out revolution electronics fuel pump controller 12003.
Available from the mfg. or several other online sites. Made in USA.
about 75$. Doesn't need oil pressure logic, works from tach signal.
I have one but have never got around to installing it yet. Gonna
have to put it on the DO list.

QJ
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Quadrajet Carb Talk and Tips / Re: What would be a good carb for my build?
« Last post by Kenth on July 08, 2025, 01:32:41 PM »
Either will be fine properly modified.
Get Cliff´s book and parts and you´ll be good to go.

https://cliffshighperformance.com/product/how-to-rebuild-and-modify-rochester-quadrajet-carburetors
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Quadrajet Carb Talk and Tips / Re: Quality, reliable mechanical fuel pumps
« Last post by taguy4 on July 08, 2025, 09:56:12 AM »
Why couldn't you just use a Carter M4891 style mechanical pump with a Jeep Wagoneer fuel filter, which has a built in return line port? I never liked the idea of putting an electric fuel pump in the gas tank for a number of reasons, and external electric pumps have problems of their own, such as being able to put them in the best location and wiring them properly so they are safe.
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Quadrajet Carb Talk and Tips / What would be a good carb for my build?
« Last post by taguy4 on July 08, 2025, 09:35:17 AM »
I'm building a mildly warmed over Chevy 305 and was wondering what a good carb would be to get for a starting point to get the fuel system dialed in. I'm using a .421/.444 lift cam (204/214 duration @ .50 lift) and flat top pistons to try for a compression ration of around 9.5-1 with 1 5/8" headers and a true dual exhaust. I doubt this engine will ever see much more than 4000 rpm. I have a stock aluminum quadrajet intake and two smog era carbs in my collection (17059226, 17059064) but I don't know if either of them would work for my application, or if I would be better off starting with an earlier non-smog carb and just running the engine without the egr, etc. This car has a 5-speed transmission and the carbs I have are both automatic trans. carbs according to the numbers (they end in even numbers).

Thanks for any help.
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Quadrajet Carb Talk and Tips / Re: Quality, reliable mechanical fuel pumps
« Last post by Kenth on July 08, 2025, 01:37:39 AM »
These guys seems to have quality products:

https://www.magnafuel.com/carbureted-regulators.html

https://robbmcperformance.com/products/regulator_bp.html
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Quadrajet Carb Talk and Tips / Re: Off idle lean condition, suggestions?
« Last post by Kenth on July 08, 2025, 01:13:57 AM »
With a properly adjusted carburetor idle/lowspeed circuit, altering the ignition curve is seldom if ever needed.

Off-idle hesitation is nearly always cured with larger downchannels.
Your Cadillac carb has around .046" downchannels and they need to be around .052"-.055" for your Chevy engine.
Also look for .035"-.036" idle tubes and .090"-.095" idle needle holes.

HTH
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Quadrajet Carb Talk and Tips / Re: Quality, reliable mechanical fuel pumps
« Last post by Kenth on July 08, 2025, 12:58:32 AM »
Good luck finding a quality American product for cheap.
For cheap you get a Chinese product no matter what it says on the box.
And yes, the box may be made in the USA but the contents may not.

FWIW
10
Quadrajet Carb Talk and Tips / Re: Quality, reliable mechanical fuel pumps
« Last post by Cadman-iac on July 08, 2025, 12:15:13 AM »
Quote from: tayto on July 03, 2025, 11:00:35 PM
make sure to retain the oil switch in the fuel pump circuit. it is usually just above the oil filter on the TBI trucks, but you can use the oil gallery under the distributor as well. this serves 2 purposes, 1. if your relay dies, once you crank enough to get above 5 psi, the pump will energize from the oil switch alone 2. takes load off the relay contacts for longer contact life.

also don't use regular fuel line in the tank,.you need to get fuel hose rated submersible. usually black hose with a pink stripe on it.

  Tayto,
 I lobotomized the computer once I decided to go with the carburetor. I removed the check engine light and replaced it with a choke indicator light.
 Unfortunately I couldn't make the pump relay work in conjunction with the choke and light. The electric choke coil  would draw too much of the current that the relay would not energize.

 Not sure why it didn't work, but I gave up trying and just wired the relay through a switch under the dash instead.

 Would you know how to get the factory pump relay to work through the oil pressure switch and also energize the electric choke and the indicator light?
 The only way I can see to do both is to use 2 different oil switches. Any suggestions?

 Rick
 
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