Fuel tank problems

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Will not start after changing fuel pump, fuel filter, cap and rotor

Chevrolet Silverado 1500 1998 Chevrolet 130000 miles

1998 5.7 Chevy 1500 C truck. It will run for two seconds without pouring fuel in throttle body, then stops. Changed fuel pump relay. Fuel tank, fuel pump, fuel filter, cap and rotor. I will change wires and plugs next. It does run when I pour fuel into the throttle body. Im getting these codes po452 p1626 po463 po108 not sure what they mean. Should I clear these codes?
I have good fuel pressure 60 psi at the test port. This is not a daily driver. Truck has been sitting several years!

Trucker Bob from United States 2 years ago

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Same issue here

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Dustman Diagnostics from United States 2 years ago

Out of the 4 codes, the P1626 is the one to be concerned with. That is the VATS system disabling the fuel system because it doesn't recognize the key at start up. Have you tried performing the key relearn procedure? Any OBD2 scanner should let you look at live data in the Body Control Module to determine if the BCM is acknowledging a valid key. The actually source of the problem varies wildly though. Could be a bad ignition switch module, a low battery, faulty BCM, etc.. . When I find BCM issues like that, I always look under the dash below the column for signs someone added an aftermarket alarm or other hackery, that is usually where the issue stemmed from.

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Trucker Bob from United States a year ago

Thanks for getting back to me. I discount the battery and then touched positive and negative wires together several times. I turned on lights and ignition. Then waited 15 min. Then connected battery back. Battery fully charged with a trickle charge on it. I turned on the ignition for 10 min. Then off for 10 seconds. I did this 4 times. Its still not starting. I did notice the alternator charge gauge and light not coming on like it did before. Still not starting. Doing the same running a few seconds then stopping. Is there a way to check the BCM and the PCM before changing them?

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Dustman Diagnostics from United States a year ago

@Trucker BobThere are procedures for 100% verifying the BCM is at fault but it involves tearing down the steering column and verifying the red w/white stripe wire at the ignition module has battery voltage with the key in the crank position. Are there any other "odd" behaviors going on? Such as brake and reverse lights staying on, horn stays on, wipers, etc.. . Without being there in person to condemn the BCM, it is almost a safe bet the BCM is at fault. If you are interested in purchasing a rebuilt module that you won't have to program, remove your current BCM from under the steering column, record the exact part #, year, make, and model of your vehicle and look these guys up: https://highway71autoparts.com/
So far their BCM's have been perfect, only need to perform the key relearn procedure and go.

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Trucker Bob from United States a year ago

@Dustman DiagnosticsOk Thanks! Where is the BCM located?

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Trucker Bob from United States a year ago

@Dustman DiagnosticsThe dash gauges stopped working. The alternator charge gauge and the oil pressure gauge. Also the security light is not working.

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WALLE from other a year ago

Mi camioneta tiembla demasiado a una baja velocidad y en carretera suele perder potencia y comensar a vibrar muy fuerte si no acelero ¿que sera?

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