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New Qjet installed [message #306807] Fri, 09 September 2016 13:06 Go to next message
JohnL455 is currently offline  JohnL455   United States
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
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Senior Member
About a year ago I was lucky enough to buy a new in box correct number replacement Qjet that Peter Huber was selling. I finally installed it. Drivability is excellent and no sags or flat spots. I only had to reduce the fast idle speed 1/4 turn and add 1/4 turn to the base idle speed. Idle mixtures ran perfect out of the box with factory cal so I did not touch. Pulling the old one, the well plug leak down was evident with pooling on the manifold floor, so morning starts at the campground should now be instant rather than waiting for bowl to fill. Manifold looks fine. That's good news. Time to change oil now that fuel dilution has ended. I think for drivability this is about as close as you can get to being handed the keys at a GMC Motorhome dealership in the 70s.

John Lebetski
Woodstock, IL
77 Eleganza II
Re: [GMCnet] New Qjet installed [message #306818 is a reply to message #306807] Fri, 09 September 2016 15:33 Go to previous messageGo to next message
mark grady is currently offline  mark grady   United States
Messages: 70
Registered: November 2015
Location: northern Indiana
Karma: 0
Member
John - Have you ever had an occasion to fix the Q-jet well leak problem,
and if so by what method?
Just curious.

Mark
N-IN
'78 Kingsley

On Fri, Sep 9, 2016 at 2:06 PM, John R. Lebetski
wrote:

> About a year ago I was lucky enough to buy a new in box correct number
> replacement Qjet that Peter Huber was selling. I finally installed it.
> Drivability is excellent and no sags or flat spots. I only had to reduce
> the fast idle speed 1/4 turn and add 1/4 turn to the base idle speed. Idle
> mixtures ran perfect out of the box with factory cal so I did not touch.
> Pulling the old one, the well plug leak down was evident with pooling on the
> manifold floor, so morning starts at the campground should now be instant
> rather than waiting for bowl to fill. Manifold looks fine. That's good
> news. Time to change oil now that fuel dilution has ended. I think for
> drivability this is about as close as you can get to being handed the keys
> at
> a GMC Motorhome dealership in the 70s.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
> Source America First
>
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> GMCnet mailing list
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'77 + 78 Kingsley
Re: New Qjet installed [message #306820 is a reply to message #306807] Fri, 09 September 2016 16:02 Go to previous messageGo to next message
Chris Tyler is currently offline  Chris Tyler   United States
Messages: 458
Registered: September 2013
Location: Odessa FL
Karma: 7
Senior Member
The leaks at the wells is a common problem on Q jets.
The fix is fairly simple. Drain the carb, blow it out and let it dry in the sun. Clean the well area with a course wire brush then clean with carb cleaner.
Mix a small quantity of quailty 5 min epoxy and completly cover the wells


76 Glenbrook
Re: [GMCnet] New Qjet installed [message #306824 is a reply to message #306818] Fri, 09 September 2016 18:01 Go to previous message
jimk is currently offline  jimk   United States
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
Senior Member
WE know that the big leak is at the lead plug below the bowel.
Most rebuilders coat that with epoxy to seal.
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
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