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#2461666 - 03/05/18 06:08 PM Thermo Quad Floods Over Help
moparpoolman Offline
enthusiast

Registered: 11/27/06
Posts: 319
Loc: NE
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

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#2461668 - 03/05/18 06:10 PM Re: Thermo Quad Floods Over Help [Re: moparpoolman]
amxautox Offline
Still Retired. Still Posting on Moparts. A Lot.

Registered: 05/13/03
Posts: 96597
Loc: On The Boat, On The Lake, Wa. ...
What is the fuel pressure from the pump?
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#2461673 - 03/05/18 06:16 PM Re: Thermo Quad Floods Over Help [Re: amxautox]
moparpoolman Offline
enthusiast

Registered: 11/27/06
Posts: 319
Loc: NE
Not sure, I'll have to check that, think its a stock mechanical pump though

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#2461683 - 03/05/18 06:31 PM Re: Thermo Quad Floods Over Help [Re: moparpoolman]
John_Kunkel Offline
I Live Here

Registered: 01/20/03
Posts: 19311
Loc: Rio Linda, CA
Main body warped or cracked.
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#2461693 - 03/05/18 06:54 PM Re: Thermo Quad Floods Over Help [Re: moparpoolman]
dynorad Offline
mopar

Registered: 01/20/03
Posts: 512
Loc: 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.

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#2461703 - 03/05/18 07:09 PM Re: Thermo Quad Floods Over Help [Re: John_Kunkel]
BLACKHEMIRR Offline
enthusiast

Registered: 09/16/04
Posts: 385
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.

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#2461706 - 03/05/18 07:17 PM Re: Thermo Quad Floods Over Help [Re: BLACKHEMIRR]
BLACKHEMIRR Offline
enthusiast

Registered: 09/16/04
Posts: 385
Oops. Dynorad beat me to it. Sorry

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#2461711 - 03/05/18 07:21 PM Re: Thermo Quad Floods Over Help [Re: moparpoolman]
500ciDuster Offline
pro stock

Registered: 01/22/03
Posts: 1580
Loc: 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

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#2461774 - 03/05/18 09:19 PM Re: Thermo Quad Floods Over Help [Re: moparpoolman]
ScottSmith_Harms Offline
Mr Wizzard

Registered: 01/20/03
Posts: 41877
Loc: Spokane Washington
Yep, my guess is a bad float or a bad float adjustment.

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#2462289 - 03/06/18 07:41 PM Re: Thermo Quad Floods Over Help [Re: ScottSmith_Harms]
moparpoolman Offline
enthusiast

Registered: 11/27/06
Posts: 319
Loc: NE
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??

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#2462318 - 03/06/18 08:20 PM Re: Thermo Quad Floods Over Help [Re: moparpoolman]
500ciDuster Offline
pro stock

Registered: 01/22/03
Posts: 1580
Loc: 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

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#2462327 - 03/06/18 08:28 PM Re: Thermo Quad Floods Over Help [Re: moparpoolman]
RTSrunner Offline
pro stock

Registered: 11/03/03
Posts: 1326
Loc: Pittsburgh,PA
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.

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#2462383 - 03/06/18 10:25 PM Re: Thermo Quad Floods Over Help [Re: moparpoolman]
ScottSmith_Harms Offline
Mr Wizzard

Registered: 01/20/03
Posts: 41877
Loc: 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.

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#2463339 - 03/08/18 06:28 PM Re: Thermo Quad Floods Over Help [Re: ScottSmith_Harms]
moparpoolman Offline
enthusiast

Registered: 11/27/06
Posts: 319
Loc: NE
Seems to be the o-ring seals, changed them and not flooding over any more. Thanks

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