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Old 08-12-2005, 12:03 AM
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65 chevy

My friend just bought a 74 chevy 1/2 ton and the carbs stalling when he hits the gas we're tryin to figure out what needs to be done to fix it

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Last edited by 65_Chevy; 08-12-2005 at 12:44 AM.
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Old 08-12-2005, 07:59 AM
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remove the air cleaner with the engine shut off, look over in the carb, move the throttle, you should see 2 streams of fuel spraying into the venturi`s.
If not then there`s a problem with the pump shot. If it`s spraying fine, check the float level, as well as the fuel pressure. you may also want to check it for vacuum leaks.
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Old 08-12-2005, 08:50 AM
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my 1981 Chevy did that when i first bought it. it turned out being that when the last guy rebuilt that carb they folded the diaphragm in the accelerator pump, and was sucking in too much air. i would suggest taking a can of ether or other starting fluid and spraying it around the carb. if the RPMs go up you have a vacuum leak.
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Old 08-12-2005, 07:36 PM
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thanks for the advice I'll do that tonight and let u know tomorrow.
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Old 08-12-2005, 07:38 PM
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Sounds like a bad accelerator pump in the carb.
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Old 08-13-2005, 12:22 AM
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couldn't get to it tonight it started raining hard hopefully tomorrow. The carb on there is new I don't know why it might have something wrong with it but it can happen. i'll try the susgestions and hopefully narrow down the problem
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Old 08-15-2005, 11:36 AM
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if it is new then it may have a bad gasket on it.
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Old 08-15-2005, 12:53 PM
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bogs when you hit the gass aye??

Sounds like the old quadrabog problem. If this is a quadrajet it is probably the vacuum secondaries opening too soon. if it bogs when you hit it from the line that is probably what it is. If when you step on the gas slowly it takes off like a normal car than it is the vacuum secondary adjustment. If it dies even when you step on the gas slowly it is probably the accelerator pump adjusted improperly or a bad accelerator pump.

Hope that helps

If it is a quadrajet and it is bogging because the secondaries come in too soon just do a search for quadraject secondaries adjustment and it will tell you how to adjust the little spring that sets the opening time.

ATB
Ric
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Old 08-15-2005, 05:35 PM
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Pump

Doc here

Consider doing a fuel pump volume/pressure test on it..The pump may be failing or clogged.

Doc
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Old 08-16-2005, 12:52 AM
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it's not a quad is a holley and yes sometimes if I hit the gas fast just for a sec it dies. If I take off normal it's fine but if I hit it off the line it bogs for a sec. I don't know how to adjust it if someone could give me a walkthrough on checkin it that would help alot thanks guys
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Old 08-18-2005, 01:49 AM
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ok i did the vaccum check i sprayed carb cleaner all around the carb with no change in idle so i guess theres no leaks
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Old 08-19-2005, 04:47 PM
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starting fluid works better for detecting leaks. carb cleaner doesnt burn that well.
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Old 08-19-2005, 06:03 PM
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Starting fluid..

Doc here,

Very true about the Starting fluid..as well as propane..

However both have one very dangerous Drawback..both are Highly Explosive! Especially the start fluid which is like 90% Ether..A cross-firing Plug wire Could cut your weekend very short!

So if you do use them, BE CAREFUL! They are good leak detectors..but it's not as hard to hurt yourself with carb cleaner..although that can happen too!

Be Safe!

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Old 08-19-2005, 11:31 PM
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ok i'll try starting fluid tomorrow
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