1973 340 Thermquad Leaks after Shutting Off, Help!
#2694985
09/06/19 02:24 PM
09/06/19 02:24 PM
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Joined: Feb 2009
Posts: 1,149 NW New Jersey
RSI700VIPER
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340 TQ started leaking fuel into the intake after I shut the car off. Then almost impossible to start without holding peddle wide open while cranking, followed by that rich, fuel smelling, smokey, start. I'm hoping someone here can get me close to where and what the problem is inside the carb. After shutting down the engine, I immediately checked inside the the carb and found that there was NO leaking above throttle plates. A little wet, but no leaks. When I cracked the throttle plates, and looked down past the butterflies, the intake is soaking wet with fuel, So the leak must be coming somewhere below the butterflies, right? Does that mean my floats are sealing and adjusted adjust ok, and its as base plate gasket leak or something else down there? No too familiar with TQs, but I hear they are prone to leaking for a bunch of reasons.
Last edited by RSI700VIPER; 09/06/19 02:25 PM.
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: 1973 340 Thermquad Leaks after Shutting Off, Help!
[Re: RSI700VIPER]
#2695007
09/06/19 03:32 PM
09/06/19 03:32 PM
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Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
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master
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Probably the well's on the bottom of the bowl under the main jets unless a leaking needle/seat,a cracked bowl also but not common.There are no other ways for a leak other than mentioned.
Last edited by 62maxwgn; 09/06/19 03:36 PM.
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Re: 1973 340 Thermquad Leaks after Shutting Off, Help!
[Re: 62maxwgn]
#2695016
09/06/19 04:09 PM
09/06/19 04:09 PM
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Joined: Feb 2009
Posts: 1,149 NW New Jersey
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62max - When you say "Probably the well's on the bottom of the bowl under the main jets" is this a gasket or an o-ring change or something more serious? I read somewhere that there are parts that are epoxy glued to the bottom of the bowl.
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: 1973 340 Thermquad Leaks after Shutting Off, Help!
[Re: RSI700VIPER]
#2695024
09/06/19 04:42 PM
09/06/19 04:42 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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I read somewhere that there are parts that are epoxy glued to the bottom of the bowl. Yes, pull the carb & you will see if it is leaking out of those wells
live every 24 hour block of time like it's your last day on earth
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Re: 1973 340 Thermquad Leaks after Shutting Off, Help!
[Re: moparmike1]
#2695072
09/06/19 09:39 PM
09/06/19 09:39 PM
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Joined: Feb 2009
Posts: 1,149 NW New Jersey
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Mike, I'm sure Scott does a great job but just looking for a quick fix to get me through the season.
Last edited by RSI700VIPER; 09/06/19 09:39 PM.
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: 1973 340 Thermquad Leaks after Shutting Off, Help!
[Re: 62maxwgn]
#2695122
09/07/19 07:30 AM
09/07/19 07:30 AM
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Joined: Feb 2009
Posts: 1,149 NW New Jersey
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Scott, would I be able to see the fuel leaking for either condition by looking down into the venturies? The carb was rebuilt 3 years ago and has been trouble free until now.
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5 1969 Daytona Charger 440 4-Speed, Dana, EV2 1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7 1970 340 Six Pack Callenger T/A 4-speed T8 Tan 1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth 1969 Talladega Torino, 428CJ 1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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Re: 1973 340 Thermquad Leaks after Shutting Off, Help!
[Re: Sniper]
#2695480
09/08/19 02:58 PM
09/08/19 02:58 PM
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Joined: Apr 2003
Posts: 12,237 Looking for a way out of Middl...
IMGTX
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I Live Here
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Looking for a way out of Middl...
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The first two Thermoquads I have rebuild I over tightened the top and crushed the X-rings. DO NOT OVER TIGHTEN THE TOP. Gentle gentle gentle. You can always snug it a little more later if it leaks out the sides of the top when cornering but you can not buy those X-rings with out the $35 kit. If anyone knows where to get them individually I would love to know.
G902 Primary Well Seal, $3.00 Thank You That rocks
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