Opinions please - Quadrajet carb flooding - Chevelle Tech
Performance Our High Performance area

 23Likes
Reply
 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 40 (permalink) Old Sep 18th, 19, 12:19 PM Thread Starter
Tech Team
James
 
Join Date: Jul 2016
Location: Roseville, CA
Posts: 987
Opinions please - Quadrajet carb flooding

Iíve got a quadrajet that was running great, and could make the engine scream and pull hard! Yesterday, I gave it a WOT before pulling into the driveway, then it stumbled and died right in front of my garage.

The carb appears to be leaking gas out of the gaskets and making the engine run rich. I can get the motor to start but stumbles then dies. Iím blasting some carb cleaner right now, it seems to help with the initial startup, but then runs rich. I tightened the idle AFR screws, but that didnít help. Could it be a stick float? How do I free it up?

A bad fuel pump and clogged filter wouldnít cause it to run rich, would it?

Hereís some pictures of the carb:





Itís a stock 66, 327, MT, points El Camino. Thanks!



Sent from my iPhone using Tapatalk
69Chvll is offline  
Sponsored Links
Advertisement
 
post #2 of 40 (permalink) Old Sep 18th, 19, 12:33 PM
Lifetime Premium Member
Randy
 
Join Date: Aug 2008
Location: Central Alabama
Posts: 4,187
Re: Opinions please - Quadrajet carb flooding

Probably a stuck float or trash in the needle and seat. Time for a rebuild, Q-jets are pretty easy to work on. Their weak spot is the epoxy plugs and the bottom of the fuel bowl, they tend to leak. If you're not comfortable building it yourself, someone here can recommend a reputable rebuilder.

Randy
TC # 5401
67 Project SS Clone

Owning a Chevelle project is like having a giant-size piggy bank that you keep pouring money into....but you can't get it back out.
pnugene is offline  
post #3 of 40 (permalink) Old Sep 18th, 19, 12:47 PM
Tech Team
 
Join Date: Feb 2019
Posts: 390
Re: Opinions please - Quadrajet carb flooding

Usual suspects, dirt in the needle and seat or the fuel pressure is too high.
hydro462 likes this.
68Chevele is offline  
 
post #4 of 40 (permalink) Old Sep 18th, 19, 12:47 PM
Gold Member
Gene
 
Join Date: Sep 2000
Location: Buffalo NY
Posts: 14,236
Re: Opinions please - Quadrajet carb flooding

Get a rebuild kit so you have that top gasket and a new needle/seat. That is likely what it is, OR your fuel pump all of a sudden decided to shoot 8+PSI at the Qjet, which it cant handle.

The only issue with disassembly are all those linkages and having to "lift an turn" the top of carb off to remove.

Maybe someone near you in CA can help out, but if not, there are a-plenty of Qjet gurus here that can guide you thru the process using this BB. ( I aint one).

In the mean, I'd get the numbers of the carb ( usually in rear, stamped vertically ) to order the right rebuild kit. Pop the carb off the engine, set up a workspace where gas fumes aint in the kitchen, and start disassembly.

As we suspect the issue is the needle and seat. In the pic below, if you follow the arms of the float up to the casting, its all that stuff under the odd looking C clip.
Attached Thumbnails
Click image for larger version

Name:	Qjet float.jpg
Views:	20
Size:	71.0 KB
ID:	603738  
davewho1 likes this.

Gene
ACES 3112/Team Chevelle Gold #62
Be big, be a 'builder'!
427L88 is offline  
post #5 of 40 (permalink) Old Sep 18th, 19, 1:19 PM
Moderator
 
Join Date: Apr 2006
Location: Far Northern Kommiefornia
Posts: 7,806
Send a message via Yahoo to davewho1
Re: Opinions please - Quadrajet carb flooding

If it's an original '66 Qjet, the numbers should be on a round metal tag embedded on the side, unless it has been removed.
427L88 likes this.

David

1966 Fremont 11A, SS396/L35 coupe - 1 of 66,843
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


MM/763; A01; A39; A51; D55; M35; N40; U14; U63


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
davewho1 is offline  
post #6 of 40 (permalink) Old Sep 18th, 19, 1:24 PM Thread Starter
Tech Team
James
 
Join Date: Jul 2016
Location: Roseville, CA
Posts: 987
Re: Opinions please - Quadrajet carb flooding

Quote:
Originally Posted by 427L88 View Post
Get a rebuild kit so you have that top gasket and a new needle/seat. That is likely what it is, OR your fuel pump all of a sudden decided to shoot 8+PSI at the Qjet, which it cant handle.



The only issue with disassembly are all those linkages and having to "lift an turn" the top of carb off to remove.



Maybe someone near you in CA can help out, but if not, there are a-plenty of Qjet gurus here that can guide you thru the process using this BB. ( I aint one).



In the mean, I'd get the numbers of the carb ( usually in rear, stamped vertically ) to order the right rebuild kit. Pop the carb off the engine, set up a workspace where gas fumes aint in the kitchen, and start disassembly.



As we suspect the issue is the needle and seat. In the pic below, if you follow the arms of the float up to the casting, its all that stuff under the odd looking C clip.


I just watched that video and sprayed a bunch more carb cleaner into the carb, plus I put some carb cleaner fuel additive into my fuel. That seemed to help. Itís not leaking out the sides and not running as rich. Hereís the latest picture after that:


I see some fuel sitting on the top. What is that part of the carb called? I need to get some fresh fuel in the tank too, I recently purchased the car last month and hadnít fueled it up yet. Iíd suspect the car has been sitting for a while, too.


Sent from my iPhone using Tapatalk
69Chvll is offline  
post #7 of 40 (permalink) Old Sep 18th, 19, 1:25 PM Thread Starter
Tech Team
James
 
Join Date: Jul 2016
Location: Roseville, CA
Posts: 987
Re: Opinions please - Quadrajet carb flooding

I would say, yes. This carb does need a overhaul. I will be doing this in the future. Any kits to recommend for the rebuild? I donít mind doing it myself.


Sent from my iPhone using Tapatalk
69Chvll is offline  
post #8 of 40 (permalink) Old Sep 18th, 19, 2:26 PM
Senior Tech Team
Dan
 
Join Date: Oct 2003
Location: IOWA
Posts: 1,878
Re: Opinions please - Quadrajet carb flooding

What Video?
Where is it?


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
LKN BCK is offline  
post #9 of 40 (permalink) Old Sep 18th, 19, 2:32 PM
Lifetime Premium Member
& Administrator
 
Join Date: Apr 2005
Posts: 16,714
Re: Opinions please - Quadrajet carb flooding

If the float is original ,I'd change it as they had a tendency to become gas logged and no longer would float.
Acted like a stuck needle.
427L88 likes this.
Mike is offline  
post #10 of 40 (permalink) Old Sep 18th, 19, 3:59 PM Thread Starter
Tech Team
James
 
Join Date: Jul 2016
Location: Roseville, CA
Posts: 987
Re: Opinions please - Quadrajet carb flooding

Lovely tailpipe gunk




Sent from my iPhone using Tapatalk
69Chvll is offline  
post #11 of 40 (permalink) Old Sep 18th, 19, 4:09 PM
Tech Team
Andy
 
Join Date: Mar 2015
Location: Lancaster PA
Posts: 169
Garage
Re: Opinions please - Quadrajet carb flooding

One common issue sometimes is the accell pump.... and from the pictures there appears to be fuel around it, I would replace that...
Ialone is offline  
post #12 of 40 (permalink) Old Sep 18th, 19, 4:18 PM
Lifetime Premium Member
Bob
 
Join Date: Mar 2005
Location: Jeannette Pa. near pittsburgh
Posts: 8,427
Re: Opinions please - Quadrajet carb flooding

When you get it running well, The next order of business is to get a STEEL fuel line and replace the RUBBER FUEL LINE. With each heat cycle of the engine the rubber may and will become brittle.
Leaking fuel on a hot intake manifold,,,,,,,,, Is not a good thing. Just some advice from a GEESER that has " been there, done that and watched it burn ".
Bob
von, hydro462 and 68-13427 like this.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
1970 SS LS-5/M-22 El Camino- Org. Owner-AACA 2016-Senior Grand National Winner---MCACN-GOLD-2013
1970 ( FRAUD) SS 468 Station Wagon - Driver.
Robinls5 is offline  
post #13 of 40 (permalink) Old Sep 18th, 19, 4:33 PM Thread Starter
Tech Team
James
 
Join Date: Jul 2016
Location: Roseville, CA
Posts: 987
Re: Opinions please - Quadrajet carb flooding

What about a rebuilt carb from rockauto? It looks like they have replacements for $275 with core charge. Which Iíd keep the carb if it is indeed original to the car. Where can I find a good rebuild kit?


Sent from my iPhone using Tapatalk
69Chvll is offline  
post #14 of 40 (permalink) Old Sep 18th, 19, 4:33 PM Thread Starter
Tech Team
James
 
Join Date: Jul 2016
Location: Roseville, CA
Posts: 987
Re: Opinions please - Quadrajet carb flooding

https://www.rockauto.com/en/catalog/...arburetor,5904


Sent from my iPhone using Tapatalk
69Chvll is offline  
post #15 of 40 (permalink) Old Sep 18th, 19, 4:50 PM
Moderator
 
Join Date: Apr 2006
Location: Far Northern Kommiefornia
Posts: 7,806
Send a message via Yahoo to davewho1
Re: Opinions please - Quadrajet carb flooding

I'd get it rebuilt by someone who knows their QJs - well plugs epoxied, etc.

Does it have the round metal carb number/date tag on it?
Vintage Musclecar likes this.

David

1966 Fremont 11A, SS396/L35 coupe - 1 of 66,843
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


MM/763; A01; A39; A51; D55; M35; N40; U14; U63


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
davewho1 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in










Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome