Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

carb flooding after engine is off

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Old May 22, 2008 | 09:52 PM
  #1  
ddg1025's Avatar
ddg1025
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From: Erie, PA
Default carb flooding after engine is off

what would cause the throttle bodys in the carb to fill up with gas after the engine is shut off
thanks with any hints
Old May 22, 2008 | 10:17 PM
  #2  
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67mustang302
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Default RE: carb flooding after engine is off

Electric fuel pump? What's your fuel pressure?
Old May 22, 2008 | 10:21 PM
  #3  
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ddg1025
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From: Erie, PA
Default RE: carb flooding after engine is off

yes it does have an electric pump it is one of those inline fuel pumps any ideas on how to stop it
Old May 22, 2008 | 10:28 PM
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67mustang302
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Default RE: carb flooding after engine is off

How is it wired, and what's the pressure? It should be wired to a switched circuit so that it stops pumping when the engine is turned off. Does it require a return line to the tank, and if so does it have one?
Old May 22, 2008 | 10:47 PM
  #5  
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ddg1025
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From: Erie, PA
Default RE: carb flooding after engine is off

it just has an on-off switch that i turn off when the engine is shut off. i dont think it requires a return line but im not sure. and it doesnt have a return line. its on this old F100 truck that was left by the last resident of my house so i dont know how it was built up
Old May 22, 2008 | 11:00 PM
  #6  
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67mustang302
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Default RE: carb flooding after engine is off

Well, first hook the pump switch wiring up to a switched circuit of the correct voltage(I'm assuming it's 12v). What's the pressure at?
Old May 22, 2008 | 11:21 PM
  #7  
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ddg1025
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From: Erie, PA
Default RE: carb flooding after engine is off

its already hooked up to a switched circuit at the right voltage but i am not sure of the pressure how much pressure does the carb need its a 2 barrel 351 i believe
Old May 22, 2008 | 11:31 PM
  #8  
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67mustang302
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From: California
Default RE: carb flooding after engine is off

Most carbs only need about 6.5psi give or take. If the pressure is too high it will overload the needle and seat pressure, and flood the bowl.
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