Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

Fuel Pump Issues after TBI to Carb Swap

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Old Sep 3, 2014 | 08:14 PM
  #1  
JrBrein1988's Avatar
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Joined: Feb 2014
Posts: 11
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From: Northwest Ohio
Car: 1988 Pontiac Firebird
Engine: LO3 5.0 (305) TBI
Transmission: 700R4
Fuel Pump Issues after TBI to Carb Swap

Alright. I have just finished swapping my 305 TBI to 350 Carb and I am getting tripped up on the fuel delivery. When the ecm is unplugged, the fuel pump wont run at all. Does the ecm directly control the fuel pump? When the fuel pump did work it pulsed for about 5 seconds the dropped. Any ideas on how to get the electric in tank fuel pump working without the ecm? Thanks in advance.
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Old Sep 3, 2014 | 11:30 PM
  #2  
91 camaro racer's Avatar
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Joined: Jun 2005
Posts: 1,245
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From: Fairfield, CA
Car: 91camaro rs,2014 silverado 5.3L
Engine: 5.7Lcarb,5.3L
Transmission: 700-r4, 6L80
Axle/Gears: strange 3.73's
Re: Fuel Pump Issues after TBI to Carb Swap

there should be a relay on the drivers side firewall near the fender. you will have to tap a switched 12v wire into one of the wires on the relay. hold on let me get a pic for you
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Old Sep 3, 2014 | 11:40 PM
  #3  
91 camaro racer's Avatar
Supreme Member
20 Year Member
iTrader: (2)
 
Joined: Jun 2005
Posts: 1,245
Likes: 8
From: Fairfield, CA
Car: 91camaro rs,2014 silverado 5.3L
Engine: 5.7Lcarb,5.3L
Transmission: 700-r4, 6L80
Axle/Gears: strange 3.73's
Re: Fuel Pump Issues after TBI to Carb Swap

you will need it find a pink wire with a black stripe, those are all 12v switched. then tap that wire into the green with white stripe wire on your fuel pump relay. here is a pic.

[IMG]20140903_233316 by , on Flickr[/IMG]
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