Quadrajet question - Team Camaro Tech
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post #1 of 11 (permalink) Old Apr 28th, 11, 06:20 PM Thread Starter
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Quadrajet question

On my 327 with cast iron intake and quadrajet the car is hard to start after it sits a day or two. Replaced fuel pump and no change. Seems that gas is leaking down and takes awhile to get back to carb. The carb is a summit rebuilt unit about 2 years old. Cranks fine while engine is warm.

67 Camaro RS 327-275hp th350 3.08 rear gear
2002 Camaro SS LS1 auto
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post #2 of 11 (permalink) Old Apr 28th, 11, 06:52 PM
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Tom
 
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Smile Re: quadrajet question

Welcome to the world of mechanical fuel pumps and carburetors ! You can live with it or switch to fuel injection ! An electric fuel pump would help.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #3 of 11 (permalink) Old Apr 28th, 11, 07:15 PM
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Tom
 
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It evaps from the bowl and also can leak from the well plugs on QJ's. Pretty common, lots of posts on this.


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'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

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post #4 of 11 (permalink) Old Apr 28th, 11, 07:18 PM Thread Starter
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Re: Quadrajet question

Thanks for the info. Yes I am ready for an ls3 conversion.

67 Camaro RS 327-275hp th350 3.08 rear gear
2002 Camaro SS LS1 auto
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post #5 of 11 (permalink) Old Apr 28th, 11, 07:19 PM
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Dan Ensign
 
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Re: quadrajet question

After the car sits for a day remove the air cleaner and while looking down the carb. move the throttle and see if the accelerator pump is pumping fuel, if it does, is the choke falling closed after working the throttle. Let us know and we will continue to help you diagnose your problem.

Dan E.
69 SS396 4spd. 4.10 posi. x66 coupe
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post #6 of 11 (permalink) Old Apr 28th, 11, 07:23 PM
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Joe
 
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Re: Quadrajet question

Had the same problem after having my old Roch. Qjet "professionally rebuilt". Turned out to be the accelerator pump. Got one from Edlebrock and it fixed the prob. That was last spring, and now it's doing the same thing. I've been reading online and hearing carb guys talking about this being a problem that's being caused by the 10% ethanol in our gas today. Not sure if that's true, but it makes sense to me. But they're cheap parts so I'll get another one and maybe I'll have to replace it often. Hope this helps.

Joe
'68 SS/RS 350
Never enough time... even less money.

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post #7 of 11 (permalink) Old Apr 28th, 11, 09:21 PM
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Re: Quadrajet question

Your q-jet is drying out. Today's fuel evaporates very quickly. On today's cars, it's not a problem since the fuel is never exposed to the atmosphere. Not true with our carbureted rigs.

If you don't believe it, pour a couple of ounces of gasoline in an open container; an open can or something. See how long it takes to evaporate.

Once the fuel level falls below the accelerator pump in the carb, it will cause hard starting.

Not much you can do. Either prime the carb with an ounce or two of gasoline (pour it into the little vent tube) or simply crank the engine and pump the accelerator pedal until she starts.

Having worked on hundreds of q-jets through the years, I think "leaking well plugs" is blamed way too often. I did an overnight test once with 5-6 old carb bodies with a paper towels underneath and fuel in the bowl. None of the paper towels had evidence of any leaking.

FWIW
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post #8 of 11 (permalink) Old Apr 29th, 11, 07:22 AM
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Re: Quadrajet question

Don't be afraid to pump the gas pedal.

Mark

68 327 4-speed 3.42 posi and a sunroof
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best so far... 13.25 at 106mph

78 Firebird 350/T350 3.23 posi
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post #9 of 11 (permalink) Old Apr 29th, 11, 08:22 AM Thread Starter
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Re: Quadrajet question

Thanks. I will let you know what I find.

67 Camaro RS 327-275hp th350 3.08 rear gear
2002 Camaro SS LS1 auto
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post #10 of 11 (permalink) Old Apr 29th, 11, 08:53 AM
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Tom
 
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Re: Quadrajet question

Quote:
Originally Posted by Straight-line-69 View Post
Your q-jet is drying out. Today's fuel evaporates very quickly. On today's cars, it's not a problem since the fuel is never exposed to the atmosphere. Not true with our carbureted rigs.

If you don't believe it, pour a couple of ounces of gasoline in an open container; an open can or something. See how long it takes to evaporate.

Once the fuel level falls below the accelerator pump in the carb, it will cause hard starting.

Not much you can do. Either prime the carb with an ounce or two of gasoline (pour it into the little vent tube) or simply crank the engine and pump the accelerator pedal until she starts.

Having worked on hundreds of q-jets through the years, I think "leaking well plugs" is blamed way too often. I did an overnight test once with 5-6 old carb bodies with a paper towels underneath and fuel in the bowl. None of the paper towels had evidence of any leaking.

FWIW
Totally agree. After a week sitting, mine goes like this: 1) crank crank crank, 2) pump pump, 3) vroom.

'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

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post #11 of 11 (permalink) Old Apr 29th, 11, 03:46 PM Thread Starter
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Re: Quadrajet question

Took the air cleaner off before starting and pumped the gas a couple times and the choke did not move. The linkage rod that goes down in the side of the carb had come unhooked. Put it back together and it fired right up. Gonna let it sit overnight and try it again before victory is declared. Thanks for the tips.

67 Camaro RS 327-275hp th350 3.08 rear gear
2002 Camaro SS LS1 auto
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