Carburetor flooding...

4STARDAD

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North Georgia
Hey y'all...gotta 67 M715 still with the original Tornado...just paid Willis America to rebuild the vacuum/fuel pump and I cleaned the Holley one barrel...but it is flooding badly...I checked the float and the vacuum slide behind the float and both seem to work fine. Anything I'm missing? I've already bought two old Chevy stovebolts but I thought I'd give the Tornado one more shot...I had it running pretty good for a bit but it didn't last long
 

INFChief

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New York
Hey y'all...gotta 67 M715 still with the original Tornado...just paid Willis America to rebuild the vacuum/fuel pump and I cleaned the Holley one barrel...but it is flooding badly...I checked the float and the vacuum slide behind the float and both seem to work fine. Anything I'm missing? I've already bought two old Chevy stovebolts but I thought I'd give the Tornado one more shot...I had it running pretty good for a bit but it didn't last long
1) Does this have a mechanical or electric fuel pump? What’s the fuel pressure at the carb? Could be way too much fuel pressure.
2) What is the model carb? I’ll see if I can find anything on it.
3) What is the float made of; brass or that synthetic material? The float could be bad or the float drop incorrect.
4) Did you replace the float needle valve & seat?
5) Sometimes the float pivot pin and spring (if equipped) may have gotten hung up.
6) Is there a fuel return line & us

I can’t believe vacuum would make it flood - vacuum simply indicates ‘load’ for the lack of a better word and load means a demand for more fuel - fuel is regulated by the fuel bowl needle valve and fuel pump.
I need to think about this some more.
 

4STARDAD

New member
21
17
3
Location
North Georgia
Yes it's the mechanical. As I noted I just got it rebuilt by Willis America out in California for $384...the carb is the original 1920 Holley single barrel. The needle and seat is changed out. The float is the original black material and it seems to push on the needle like it's supposed to. It sits on a new spring that pushes up like normal. The vacuum slide also functions. I don't have a way to check fuel pressure but I'd guess it's probably high. The fuel return line is hooked up,but the tank is now in the back of the truck. Could that be why,because the fuel return has to go uphill? Does anyone know of a location to get a tank to hang in it's original location?
Thanks yall
 

Barrman

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The Holley needle and seat will foul if you say "Dirt" within earshot of the truck. I suggest pulling the float bowl, blowing through the needle and seat, put it all back together and see if it is better. If everything else is correct that will probably fix it. I had 2 inline filters on mine and it would still go to automatic flood about once a month.
 

4STARDAD

New member
21
17
3
Location
North Georgia
The Holley needle and seat will foul if you say "Dirt" within earshot of the truck. I suggest pulling the float bowl, blowing through the needle and seat, put it all back together and see if it is better. If everything else is correct that will probably fix it. I had 2 inline filters on mine and it would still go to automatic flood about once a month.
You got some good cranking instructions? I always choke it but I don't touch the pedal
 

Barrman

Well-known member
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Giddings, Texas
Stock distributor? Timing set correctly? If yes, then maybe a single pump on a cold day. Otherwise it will fire up like it wants to go play.

Mine would flood if you pumped more than once It seemed.
 

4STARDAD

New member
21
17
3
Location
North Georgia
Stock distributor? Timing set correctly? If yes, then maybe a single pump on a cold day. Otherwise it will fire up like it wants to go play.

Mine would flood if you pumped more than once It seemed.
Thank you....I wish I could get it to run long enough to check the timing
 

4STARDAD

New member
21
17
3
Location
North Georgia
1) Does this have a mechanical or electric fuel pump? What’s the fuel pressure at the carb? Could be way too much fuel pressure.
2) What is the model carb? I’ll see if I can find anything on it.
3) What is the float made of; brass or that synthetic material? The float could be bad or the float drop incorrect.
4) Did you replace the float needle valve & seat?
5) Sometimes the float pivot pin and spring (if equipped) may have gotten hung up.
6) Is there a fuel return line & us

I can’t believe vacuum would make it flood - vacuum simply indicates ‘load’ for the lack of a better word and load means a demand for more fuel - fuel is regulated by the fuel bowl needle valve and fuel pump.
I need to think about this some more.
Can you tell me if the fuel return line is supposed to have a constant flow? I disconnected it from the tank and there was nothing
 
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