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Some fuel pumps come with a new harness and butt connectors to attach them. Peel back the loom close to the pump connection and check the connection if it has them. If it does have butt connectors remove them and solder the wires with heat shrink tubing. Keep in mind your close to the fuel tank.
Black smoke is usually extra fuel, but you say you are priming it to start so that could be why. Have you checked fuel pump pressure before and after cranking ?
install new fuel pump then turn key on but do not crank the engine then listen for pump when it stops turn key off then repeat 5 or six time, this will prime the pump and get fuel up to injectors
Will it continue to run aftre you manually prime it? If so, you are lossing fuel pressure over time which may indicate a leak in a line and or a faulty fuel pump. (low pressure) Could also be a restriction in fuel line (filter) Frozen water in the line is not unheard of in cold climates.
I would check to see if you are getting power to the fuel pump. I would check the fuel pump fuse and relay if you aren't getting power to the pump. You may have got a defective fuel pump.
the pressure regulator may be leaking. pull he vac line and see if its wet. wet is bad. Also these fuel pump connectors are known to overheat from poor connections. Do a search on gm fuel pump repeat failures and overheating connectors. Also the fuel pump could be leaking down so the line needs to be primed. Try cycling the key about 3 to 5 times before you start it. The pump will prime for 3 seconds each time before shutting off. If this helps the problem is the fuel pump.
Dark green provides power to fuel pump relay from the ECU. Orange wire at fuel pump relay is power at all time and is provide from the ECM/Bat Fuse at fuse block (Left side of dash). It also connects to the fuel pump oil pressure switch. The grey wire at relay provides power to the fuel pump and fuel pum oil pressure switch. The red plug thats tape to harness from relay/fuse center is the prime connector..
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