HELP QuadraJet experts weigh in...

Rktpwrd

Rktpwrd

Royal Smart Person
Feb 2, 2015
1,788
5,295
113
Calgary, Alberta, Canada
#1
Hey guys

I’ve just had a friend rebuild my Chevy QuadraJet. He’s done a good job and it runs well, but there’s a plastic plug or cap at the front of the fuel inlet that’s leaking. It was leaking before the rebuild and I had JB Welded it up as a temporary fix, but now it’s leaking again.

It’s not a serviceable or replaceable part as near as I can tell, there was no replacement for it in the rebuild kit I bought. It looks to be some sort of plastic plug or something that was lacquered over.
Any one come across this before or have thoughts on to how to fix this properly?

9d24c62b-78a7-4129-b848-7d80e0d9a442-jpeg.84543


Pics of one on a different carb:

192606a0-d98e-495d-b663-fe47552150fc-jpeg.84544


cdba4dee-04cf-45cb-9874-a96203e987fe-jpeg.84545


Thanks in advance for any insight anyone has on this.

D.
 
olds307 and 403

olds307 and 403

Comic Book Super Hero
Oct 14, 2008
3,491
1,446
113
Melville,Saskatchewan
#2
That is one of the factory swagged casting plugs. The best way would be to carefully drill it out and tap then add a threaded plug with the threads sealed with JB Weld.
 
G

Gremlinsteve

Greasemonkey
Mar 6, 2018
236
221
43
#3
That is one of the factory swagged casting plugs. The best way would be to carefully drill it out and tap then add a threaded plug with the threads sealed with JB Weld.

I agree
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
23,792
8,878
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Kitchener, Ontario
#4
If you remove the filter and look at the end of the hole for the filter you'll see that plug is used to cover the hole they drilled for the fuel flow to enter the carb. I would get rid of that plastic plug and get a proper plug or tap it like suggested
 
Clone TIE Pilot

Clone TIE Pilot

Royal Smart Person
Aug 14, 2011
1,828
457
63
Galaxy far far away
#5
Never heard of one with a plastic plug before. Wonder if it is a weird reman unit? The remanufacturers do some weird things to Qjets.
 
Longroof79

Longroof79

Geezer
Oct 14, 2008
9,571
5,235
113
Gainesville, Fl
#6
D,
The plug that you indicate is metal on my Q-jet.
Speaking of Q-jets. How is your fuel line routed, and are you using a steel line? I figured I'd ask knowing that you're using the Chevy carb configuration.
 
Rktpwrd

Rktpwrd

Royal Smart Person
Feb 2, 2015
1,788
5,295
113
Calgary, Alberta, Canada
#7
That is one of the factory swagged casting plugs. The best way would be to carefully drill it out and tap then add a threaded plug with the threads sealed with JB Weld.
Thanks for the clarification and enlightening me Christian.
Your solution to get it sealed up sounds like the best course of action, and that’s what I’ll do. I just didn’t know if there was a proper or specific plug to get somewhere to replace it with.
Thanks very much.

If you remove the filter and look at the end of the hole for the filter you'll see that plug is used to cover the hole they drilled for the fuel flow to enter the carb. I would get rid of that plastic plug and get a proper plug or tap it like suggested
Steve, thanks for revealing the reason for the plug there in the first place. Now that you’ve mentioned that, it makes perfect sense.
Thanks for solving that mystery.

Never heard of one with a plastic plug before. Wonder if it is a weird reman unit? The remanufacturers do some weird things to Qjets.
It’s entirely possible I suppose. There’s no guarantee that it’s the same carb after 38 years...
That’s what makes this plug so strange, it’s a bit of a hybrid with both - a metal housing around a plastic center. Either way, it’s outta there very soon and will be replaced with a hex head pipe plug.

D,
The plug that you indicate is metal on my Q-jet.
Speaking of Q-jets. How is your fuel line routed, and are you using a steel line? I figured I'd ask knowing that you're using the Chevy carb configuration.
Jack, I kept the metal fuel line that originally went into the inlet and reused it on the new engine. It was originally a 305 Chevrolet engine anyways, so it fit quite pretty good on the 350 as well. I just had to tweak the other end to work with the aftermarket mechanical fuel pump I was forced to put on it.
Here’s a couple of pics showing the routing.

6809acdf-7c73-4c1a-b1c3-7f54a0bf15f3-jpeg.84583


f02b8641-38fb-436e-b6d7-85380c52b419-jpeg.84584
 
Longroof79

Longroof79

Geezer
Oct 14, 2008
9,571
5,235
113
Gainesville, Fl
#8
Thank you, sir. I truly appreciate you taking your time to post a few pics of your fuel line setup. I've been running a Holley on it for years and never had a Q-jet on this engine before.
My original 305 was Q-jet equipped, but I never kept the original steel fuel line. I will be improvising and bending up a new line once I get the Q-jet on there.
This is the stuff I will be using. https://shop.advanceautoparts.com/p/poly-armour-domestic-poly-armour-pvf-steel-brake-fuel-transmission-line-3-8-x-72-pa-672/22190070-P?searchTerm=3/8"+steel+fuel+line
 
Rktpwrd

Rktpwrd

Royal Smart Person
Feb 2, 2015
1,788
5,295
113
Calgary, Alberta, Canada
#9
Thank you, sir. I truly appreciate you taking your time to post a few pics of your fuel line setup. I've been running a Holley on it for years and never had a Q-jet on this engine before.
My original 305 was Q-jet equipped, but I never kept the original steel fuel line. I will be improvising and bending up a new line once I get the Q-jet on there.
This is the stuff I will be using. https://shop.advanceautoparts.com/p/poly-armour-domestic-poly-armour-pvf-steel-brake-fuel-transmission-line-3-8-x-72-pa-672/22190070-P?searchTerm=3/8"+steel+fuel+line
No problem Jack, it was nothing at all. I had a look at that stuff in the link you included, it looks like it’s going to be a quality product to use. Be sure to report back on how it was to work with and how it holds up. (They really boast about its corrosion resistance properties).
I’m personally interested in this as well, because I have a short rubber splice between the barb on the fuel pump fitting and the original metal line. I’d eventually like to re-plumb it entirely in hard line like the factory did.
One less thing to fail.
 
MrSony

MrSony

Comic Book Super Hero
Nov 15, 2014
4,078
2,448
113
Des Moines, Iowa
#10
Thanks for the clarification and enlightening me Christian.
Your solution to get it sealed up sounds like the best course of action, and that’s what I’ll do. I just didn’t know if there was a proper or specific plug to get somewhere to replace it with.
Thanks very much.



Steve, thanks for revealing the reason for the plug there in the first place. Now that you’ve mentioned that, it makes perfect sense.
Thanks for solving that mystery.



It’s entirely possible I suppose. There’s no guarantee that it’s the same carb after 38 years...
That’s what makes this plug so strange, it’s a bit of a hybrid with both - a metal housing around a plastic center. Either way, it’s outta there very soon and will be replaced with a hex head pipe plug.



Jack, I kept the metal fuel line that originally went into the inlet and reused it on the new engine. It was originally a 305 Chevrolet engine anyways, so it fit quite pretty good on the 350 as well. I just had to tweak the other end to work with the aftermarket mechanical fuel pump I was forced to put on it.
Here’s a couple of pics showing the routing.

View attachment 84583

View attachment 84584
I love how that engine looks. So clean.
 

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