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12/23/15 1:18pm - Original Message: '73 Quadrajet Leaking'
Tooch1
Former Member
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Vette(s):
1973 Convertible, L48, 4 Speed, PS, Numbers Matching, Mille Miglia Red, Dark Red Interior NCRS Top Flight Award Chapter/ June 2016

Joined: 11/29/2015
Posts: 47
My 73 quadrajet just started to leak out the front left side plug, that is installed on the Chevy carb because of the side mount fuel inlet. I did also post a thread on the NCRS forum for this. Most suggested an epoxy repair. Wondering if anyone here has had the same problem which appears to be a common one? I'll probably end up taking it to my mechanic if it can't be done while still on the car. Also what epoxy so are the best to use? I won't use JB Weld, it has never worked on anything for me!!! It did stick to my fingers though lol. I know many people swear by it though. I'll try to post a couple photos. Can't post photos here. Every time I try it says I'm using the wrong type. To be honest I've had a terrible time down loading any photo on this forum. Maybe it's just me. Thanks and Merry Christmas! Regards

Quad Pic







|UPDATED|12/23/2015 11:18:26 AM (AZT)|/UPDATED|


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Tooch1 Pittsburgh Tri State Chapter NCRS Laurel Valley Corvette Club
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12/23/15 9:56am - Reply: 'Re: 73 Quadrajet Leaking'
Tooch1
Former Member
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Vette(s):
1973 Convertible, L48, 4 Speed, PS, Numbers Matching, Mille Miglia Red, Dark Red Interior NCRS Top Flight Award Chapter/ June 2016

Joined: 11/29/2015
Posts: 47
I did get a photo to post. Don't think anyone will have a hard time seeing it ? Do you? Not sure how to change size. Sorry!

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Tooch1 Pittsburgh Tri State Chapter NCRS Laurel Valley Corvette Club
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12/23/15 1:28pm - Reply: 'Re: 73 Quadrajet Leaking'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19457
 LOL  Life-sized pics can be an issue....I fixed it for ya. Thumbs Up

That is a core plug....basically a soft metal plug pressed into the bore, and then peened to hold it in. There are several of the same type plugs on the bottom of the carb bowl that leak,too. The best way to fix them without using an epoxy is to simply tap around the circumference of the plug with a small hammer. This will tighten the plug in the bore.
There is a JB Weld product that is specifically made to use with gasoline that will work. The regular JB Weld will not normally stand up to fuels...even tho they say it will. It does need to be mixed properly to work. Approve


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Joel Adams
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12/23/15 2:12pm - Reply: 'Re: 73 Quadrajet Leaking'
Vman73
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Gig Harbor, WA - USA

Vette(s):
1973 L82 4 Speed Coupe - Very original, well documented driver/survivor. 2016 Bend Regional NCRS Top Flight.

Joined: 10/2/2014
Posts: 362
Jim, +1 on peening that front plug to stop it from leaking. Never done it personally, see if you can find an old quadrajet carb body to practice on. .................. Regarding pics, try using Google Chrome as your browser. When you insert the photo, there is a pop up window where you can adjust the size. I think I generally adjust to around 400 x 200. Good luck !!

|UPDATED|12/23/2015 12:12:04 PM (AZT)|/UPDATED|


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John Sigmund
valkman57@sbcglobal.net
NCRS Member 61302
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12/23/15 8:40pm - Reply: 'Re: 73 Quadrajet Leaking'
Tooch1
Former Member
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Vette(s):
1973 Convertible, L48, 4 Speed, PS, Numbers Matching, Mille Miglia Red, Dark Red Interior NCRS Top Flight Award Chapter/ June 2016

Joined: 11/29/2015
Posts: 47


|UPDATED|12/23/2015 6:40:18 PM (AZT)|/UPDATED|


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Tooch1 Pittsburgh Tri State Chapter NCRS Laurel Valley Corvette Club
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12/23/15 8:38pm - Reply: 'Re: 73 Quadrajet Leaking'
Tooch1
Former Member
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Vette(s):
1973 Convertible, L48, 4 Speed, PS, Numbers Matching, Mille Miglia Red, Dark Red Interior NCRS Top Flight Award Chapter/ June 2016

Joined: 11/29/2015
Posts: 47
Too late to try the penning technique, I already removed the carb this afternoon. Dried it out, stood it up on end with the plug up so any remaining fuel won't run to plug area. Used air to blow it dry. Cleaned the area and scuffed it up with sandpaper, then cleaned again and blew it with air making sure it was dry. Applied regular two tube JB weld epoxy as recommend by everyone on the NCRS forum and my mechanic. Will let it cure for the Next two days, will reinstall after Christmas. Hoping it will work. Impossible to see this part of carb with air cleaner installed on the 73. If it works I'll take the minor point deduct at judging. It never ends with these cars😡 Thanks for your suggestions guys. Merry Christmas.

|UPDATED|12/23/2015 6:38:15 PM (AZT)|/UPDATED|


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Tooch1 Pittsburgh Tri State Chapter NCRS Laurel Valley Corvette Club
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12/23/15 9:32pm - Reply: 'Re: 73 Quadrajet Leaking'
Tooch1
Former Member
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Vette(s):
1973 Convertible, L48, 4 Speed, PS, Numbers Matching, Mille Miglia Red, Dark Red Interior NCRS Top Flight Award Chapter/ June 2016

Joined: 11/29/2015
Posts: 47
Thanks for the photo fix too!

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Tooch1 Pittsburgh Tri State Chapter NCRS Laurel Valley Corvette Club
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12/25/15 5:17pm - Reply: 'Re: 73 Quadrajet Leaking'
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 396
One of the secrets to mixing any epoxy is to avoid mixing it on a porous surface and/or using a porous mixing tool as some materials will absorb some of the essential chemicals from the epoxy during and after mixing.

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1973 L-82 4 spd

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12/25/15 7:24pm - Reply: 'Re: 73 Quadrajet Leaking'
dwa175 Gold Member
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oakville, CT - USA

Vette(s):
1979 coupe and now 2007 c-6

Joined: 7/19/2014
Posts: 183
I have   done many of these q-jets,  this problem has been around for a long time,don,t get to crazy hammer in a new plug and let it go,if you like go to a chevy dealer ,you can get new plugs from g. m.   if you like ,put the plug in, that's  that  , I have a olds than caught on fire the plug came out while driving almost burned the car to to ground thr fire dept saved it, ins paid for repair   gm knew of this problem and settled lawsuits for this   check history of q-jet plugs coming out,just for your info   dwa175Beer

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12/27/15 10:08am - Reply: 'Re: 73 Quadrajet Leaking'
Tooch1
Former Member
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Vette(s):
1973 Convertible, L48, 4 Speed, PS, Numbers Matching, Mille Miglia Red, Dark Red Interior NCRS Top Flight Award Chapter/ June 2016

Joined: 11/29/2015
Posts: 47
Thank you all for your comments and suggestions. Happy New Year!

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Tooch1 Pittsburgh Tri State Chapter NCRS Laurel Valley Corvette Club
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12/28/15 12:00pm - Reply: 'Re: 73 Quadrajet Leaking'
manchestershark Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1900
  If you are still having a problem with leakage, I have used clear nail polish to stop leaks. It is not affected by gas, and needs to cure for a couple days. It will take a couple coats. I did a stand pipe in a carb from my 1974 Hondamatic motorcycle.  The dealer said it could not be fixed, and charged me $80.00 to tear it apart, and I had it off the bike. Still works and no leaks.

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12/28/15 3:23pm - Reply: 'Re: 73 Quadrajet Leaking'
Tooch1
Former Member
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Vette(s):
1973 Convertible, L48, 4 Speed, PS, Numbers Matching, Mille Miglia Red, Dark Red Interior NCRS Top Flight Award Chapter/ June 2016

Joined: 11/29/2015
Posts: 47
Thank you, that's something I've never heard before. Will keep it in mind if needed down the road. I haven't put the carb back on the car yet, so I don't know if I fixed the issue.

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Tooch1 Pittsburgh Tri State Chapter NCRS Laurel Valley Corvette Club
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