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Thermo Quad Floods Over Help #2461666
03/05/18 09:08 PM
03/05/18 09:08 PM
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moparpoolman Offline OP
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On a 72 400 my Thermo Quad floods over after the car is turned off. I just replaced the needle and seats and made sure the floats were at the right adjustment. Started it up, ran great, ran it for a while, got it up to temp, turned it off and in about a minute it starts flooding over again. I can see it dripping in the primarys and it drips out the primary throttle shaft on the passenger side. Am I missing something? Anyone else have this problem? Possible solutions? Thanks

Re: Thermo Quad Floods Over Help [Re: moparpoolman] #2461668
03/05/18 09:10 PM
03/05/18 09:10 PM
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On The Boat, On The Lake, Wa. ...
amxautox Offline
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On The Boat, On The Lake, Wa. ...
What is the fuel pressure from the pump?


Tom

"Everyone should believe in something; I believe I'll go fishing."

-Henry David Thoreau

Men and fish are alike. They both get into trouble when they open their mouths

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Re: Thermo Quad Floods Over Help [Re: amxautox] #2461673
03/05/18 09:16 PM
03/05/18 09:16 PM
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moparpoolman Offline OP
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Not sure, I'll have to check that, think its a stock mechanical pump though

Re: Thermo Quad Floods Over Help [Re: moparpoolman] #2461683
03/05/18 09:31 PM
03/05/18 09:31 PM
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Rio Linda, CA
John_Kunkel Offline
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Rio Linda, CA
Main body warped or cracked.


I'm supposed to respect my elders, but its getting harder and harder for me to find one now.
Re: Thermo Quad Floods Over Help [Re: moparpoolman] #2461693
03/05/18 09:54 PM
03/05/18 09:54 PM
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Posts: 512
Niwot, CO Formerly denn...
dynorad Offline
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Niwot, CO Formerly denn...
It sounds like the fuel is boiling in the bowls. If you have vertical space you might consider a thermoplastic carb spacer and a heat shield.

Re: Thermo Quad Floods Over Help [Re: John_Kunkel] #2461703
03/05/18 10:09 PM
03/05/18 10:09 PM
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BLACKHEMIRR Offline
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If you run it and shut it off while it's cold, does it overflow? If not, you might be able to rule out fuel pressure and look more at heat related causes. However, I think the Thermoquads have a pretty large bowl vent, so it's hard to believe the bowls could be pressurizing (from fuel vaporizing) and forcing fuel out when you shut it off. Just a thought.

Re: Thermo Quad Floods Over Help [Re: BLACKHEMIRR] #2461706
03/05/18 10:17 PM
03/05/18 10:17 PM
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BLACKHEMIRR Offline
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Oops. Dynorad beat me to it. Sorry

Re: Thermo Quad Floods Over Help [Re: moparpoolman] #2461711
03/05/18 10:21 PM
03/05/18 10:21 PM
Joined: Jan 2003
Posts: 1,624
McGregor,Iowa 52157
5
500ciDuster Offline
top fuel
500ciDuster  Offline
top fuel
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McGregor,Iowa 52157
both styles of floats can sink after years of use, with brass you can usually feel gas sloshing inside. The wells will leak after years also and I've had good luck using JB weld to glue them back on

Re: Thermo Quad Floods Over Help [Re: moparpoolman] #2461774
03/06/18 12:19 AM
03/06/18 12:19 AM
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Posts: 42,454
Spokane Washington
ScottSmith_Harms Offline
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Spokane Washington
Yep, my guess is a bad float or a bad float adjustment.

Re: Thermo Quad Floods Over Help [Re: ScottSmith_Harms] #2462289
03/06/18 10:41 PM
03/06/18 10:41 PM
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moparpoolman Offline OP
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Thank you for the thoughts thus far. This is where I am now.

does it with engine cold or hot
has about 4-5 psi fuel pressure
floats and float levels are good
tested needle and seats and they are good
plastic body not cracked or warped
epoxied jet bowls are good, no leaks

could the gaskets / o-rings for the 2 aluminum tubes from the upper aluminum top that seal next to the jets in the plastic body cause flooding over??

Re: Thermo Quad Floods Over Help [Re: moparpoolman] #2462318
03/06/18 11:20 PM
03/06/18 11:20 PM
Joined: Jan 2003
Posts: 1,624
McGregor,Iowa 52157
5
500ciDuster Offline
top fuel
500ciDuster  Offline
top fuel
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McGregor,Iowa 52157
That was something that I forgot to mention and should be looked at, they get compressed and don't work like they should over time

Re: Thermo Quad Floods Over Help [Re: moparpoolman] #2462327
03/06/18 11:28 PM
03/06/18 11:28 PM
Joined: Nov 2003
Posts: 1,447
Pittsburgh,PA
RTSrunner Online content
pro stock
RTSrunner  Online Content
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The O-rings at the base of the bowl like mentioned above(I had one fall out or missed on install once,had a little fire!) Possibly try lowering the float level a tiny bit from spec it may help.

Re: Thermo Quad Floods Over Help [Re: moparpoolman] #2462383
03/07/18 01:25 AM
03/07/18 01:25 AM
Joined: Jan 2003
Posts: 42,454
Spokane Washington
ScottSmith_Harms Offline
Mr Wizzard
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Spokane Washington
BTW, those O-rings should be square shouldered (look like a tiny slice of rubber hose). Round O-rings (found in some rebuild kits) can sometimes leak.

Re: Thermo Quad Floods Over Help [Re: ScottSmith_Harms] #2463339
03/08/18 09:28 PM
03/08/18 09:28 PM
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moparpoolman Offline OP
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Seems to be the o-ring seals, changed them and not flooding over any more. Thanks


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