1998 Chev S-10 Pick-up Won't Start - Fuel System

Question: no fuel pressure at top of engine checked fuel pump and found ony 5 volts on one of three leads, swaped around relays for fuel system still no 12 volts at pump, in the past I aways heard a hum from fuel pump, engine will run when sparying carb cleaner in intake, also checked wiring from relay to pump all good but did not find fuse labled fuel pump. is their a fuse, must be right? also is thier a sensor on fuel systems that tells the pump to run or does it run all the time?

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Technican: Hello, When the key is turned to ON the fuel pump should run for two seconds and stop to pressure up the fuel injector rail. Once the key is turned to START the Powertrain Control Module (PCM) will sense the engine is cranking and that there is oil pressure so the PCM will energize the fuel pump relay. The fuel pump will run continuously until the PCM loses crank signal or oil pressure data. Have you looked under the hood for a relay/fuse box and checked those fuses? Fuel pumps generally run on a 20 amp circuit. I'll check for a fuse box roster and see what I can find for you. What color wire are you reading the approx 5 volts on? What size engine, please?
Technican: The wiring diagram I am looking at shows the fuse label to say "ECM B" 20 amp and should have power at all times. This fuse sends power to the fuel pump relay on an Orange Wire. The PCM/ECM will send power to the relay via a DK Green/White Wire to energize the relay. When the relay energizes it will send power to the fuel pump on a Gray Wire. Your thoughts?,
Technican: I need to hear from you as to the status of this question, please. Still want help?

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