Cliff's Quadrajet Parts and Rebuild Kits

Quadrajet Problem Solving => Diagnose a Quadrajet carburetor problem => Topic started by: dlphil10 on June 07, 2019, 04:51:42 PM

Title: Sucking noise on shutdown
Post by: dlphil10 on June 07, 2019, 04:51:42 PM

I'm getting the car lined out, but I've noticed when I shutdown the car the carb makes noises. Immediately after the engine has completely stopped the carb sounds like its gurgling or sucking. Really it faintly sounds like a Turkey gobbling. The primary nozzle look a bit wet too.

Could it be too high float or bad needle and seat?

Title: Re: Sucking noise on shutdown
Post by: Cliff Ruggles on June 08, 2019, 03:01:04 AM

Remove the air cleaner and see if there is any fuel vapor coming up out of the carb.

This would indicate fuel draining into the engine.  This happens when the bottom plugs are leaking, N/S not holding, fuel level too high, or missing upper idle airbleeds (common problem when folks miss-match parts)........Cliff

Title: Re: Sucking noise on shutdown
Post by: dlphil10 on June 08, 2019, 08:48:37 PM

I had someone shut it off so I could see what happened. No fuel vapor was coming out of carb. The nozzles were also dry.

Title: Re: Sucking noise on shutdown
Post by: Cliff Ruggles on June 10, 2019, 05:00:40 AM

So did it still make all the noises and where are the coming from?

Title: Re: Sucking noise on shutdown
Post by: lightning boy on June 10, 2019, 05:01:38 AM

check the charcoal canister. make sure its not plugged up.

Title: Re: Sucking noise on shutdown
Post by: dlphil10 on June 10, 2019, 07:37:17 AM

Thanks for the replies. There is no charcoal canister on my car (69 LeMans). It made the same gurgling noise immediately after shutdown. It only happens for a few seconds.

There was no vapor and the nozzles were dry for the duration of the sound.

Title: Re: Sucking noise on shutdown
Post by: Cliff Ruggles on June 10, 2019, 04:56:33 PM

Can you at least narrow down where the noise is coming from?

Title: Re: Sucking noise on shutdown
Post by: dlphil10 on June 10, 2019, 05:16:44 PM

Yes, my apologies. The noise is definitely coming from the carb. It happens so fast it's hard to get a pulse on where exactly it is, but it sounds like its coming from the fuel bowl.

Title: Re: Sucking noise on shutdown
Post by: Cliff Ruggles on June 11, 2019, 02:19:07 AM

If it's draining some fuel into the intake it would not fire back up well or act flooded if you tried to restart it.......Cliff