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TBI to Carb swap, looses fuel pressure after warm

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Old Jul 6, 2005 | 10:29 PM
  #1  
del91_305's Avatar
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From: Kingsport,tn
Car: 1991 camaro RS
Engine: 305 Carb
Transmission: 700R4
TBI to Carb swap, looses fuel pressure after warm

I have made the swap from TBI to Carb, along with ported 081 heads, edelbrock intake and cam. I am using an inline return style regulator. The problem im having is, when i start the car i can adjust the pressure to around 5 psi and it will keep. Then once the engine warms up, the presure drops off and the gauge reads zero, but if i rev the engine the pressure will increase and i can see fuel through the filter, the higher i rev the engine the higher the pressure, but at an idle it doesnt get any pressure and the engine dies. Could this be something to do with the ECM maybe? If i have to i will get a manual pump. Any suggestion will be great because i cant figure it out.
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Old Jul 7, 2005 | 09:04 AM
  #2  
del91_305's Avatar
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Joined: Dec 2002
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From: Kingsport,tn
Car: 1991 camaro RS
Engine: 305 Carb
Transmission: 700R4
anyone??
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Old Jul 7, 2005 | 10:03 AM
  #3  
Benm109's Avatar
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Joined: Feb 2004
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From: Greenville, SC
Car: 1991 Chevy Camaro
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.42
Where is your fuel pressure gauge mounted? Is the engine still running when it says FP is zero?

https://www.thirdgen.org/techbb2/sho...=fuel+pressure
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Old Jul 7, 2005 | 10:38 AM
  #4  
del91_305's Avatar
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From: Kingsport,tn
Car: 1991 camaro RS
Engine: 305 Carb
Transmission: 700R4
The gauge is mounted right above the manifold. the engine will stop running if i just let it sit and idle, but like i said, when i rev the engine the pressure increases, its very wierd.
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Old Jul 7, 2005 | 04:03 PM
  #5  
del91_305's Avatar
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From: Kingsport,tn
Car: 1991 camaro RS
Engine: 305 Carb
Transmission: 700R4
Ok, i have done some research, and found that the oil pressure switch controls the pump. Could this be my problem?

Last edited by del91_305; Jul 7, 2005 at 04:23 PM.
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