Question about 1996 GMC Sonoma
You will need to hook up an oil pressure switch to keep the fuel pump running.
The computer runs the pump when cranking but the oil pressure switch is what keeps it running.
This is to keep the fuel pump from running if the engine quits or if in an collision the fuel pump shuts off.
You may be able to use the switch from the 2.2.
If there is a pressure switch for the oil gauge already in the 4.3 you may need to install a tee to adapt it in.
The wire colors you are looking for to the switch should be orange and gray.
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Posted on Mar 24, 2011
Firstly, 7 psi is too high for a carb and will tend to override the needle and seat, you want a fuel pressure somewhere around 3 to 3.5 psi max.
You must have the pump wired up to a connection that is off when the engine is running but on in the accessory position. Try find a supply like the ignition supply and run it through a relay to power the pump.
Posted on Mar 23, 2011
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Posted on Jan 02, 2017
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