how do I correct a Code 54, FUEL PUMP CIRCUIT (LOW VOLTAGE)?

What is your question?

Truck will crank but will not always start, I have fuel to TBI, new pump, will start with starter fluid sometimes, lose spark. new fuel relay, pump will prime when ignition is turned on. I also get a Code 43, replace Knock sensor, engine is new OEM, ran good for (4) months, new coil, plugs, distributor, wires. Engine will run for a few minutes, surge and shut down.