Question about 2000 Chevrolet Astro

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Fuel pump will not kick on, I replaced it with a brand new one and still nothing. I checked the fuel pump relay and Ignition control module and both were good. I ran power straight to the harness on the fuel pump side and it turned on. I'm clueless as to what it might be next. =(

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Try checking ground on frame they are know to have a bad grounds from time to time

Posted on Oct 08, 2008

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Section 10-01: Fuel Tank, Filters, Lines and Electric Fuel Pump 1995 Thunderbird, Cougar Workshop Manual
DESCRIPTION AND OPERATION Fuel Pump, Electric The electric fuel pump:
  • Is part of the fuel pump module.
  • Is located in an internal reservoir in the polyethylene fuel tank (9002) .
  • Is mounted with its inlet at the bottom of the reservoir.
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  • The fuel pump module also has an internal release valve to provide protection from too much pressure if fuel flow becomes clogged in the fuel filter (9155) , the fuel line is damaged, or other factors.
  • Overpressure is limited to 850 kPa (123 psi) and reduced fuel flow will result if the pressure relief valve is activated.
  • The fuel pump module is protected at its inlet by a nylon fuel filter element (9365) which filters contaminants which could plug or damage fuel pump components.
  • The fuel filter element simultaneously allows passage of small quantities of water which may accumulate within the tank reservoir.
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  • The electrical system provides power to the fuel pump module through two relays:
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    • PCM power relay.
The current path depends on operating conditions.
  • When the ignition switch (11572) is OFF, contacts of both relays are open.
  • When the ignition switch is first turned to RUN, the PCM power relay energizes and closes its contacts.
  • Power is sent to the fuel pump relay and a timing device in the powertrain control module .
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  • The circuitry provides pre-pressurization of the fuel system.
  • When the ignition switch is turned to START, the powertrain control module operates the fuel pump relay to provide fuel while cranking.
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