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Test NS-7B - Inspecting Fuel Pump

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Turn ignition off. Disconnect fuel pump relay. Turn ignition on. Probe Dark Blue wire (White/Yellow wire on Wrangler) in fuel pump relay connector. If voltage is 10 volts or less, repair Dark Blue wire (White/Yellow wire on Wrangler) for an open circuit to splice. Perform VERIFICATION TEST VER-1  .
  2. If voltage is more than 10 volts, measure resistance across fuel pump relay terminals "A" and "C". See Figure . If resistance is 100 ohms or more, replace fuel pump relay. Perform VERIFICATION TEST VER-1  . If resistance is less than 100 ohms, repair open Dark Blue/Yellow wire (Orange/Dark Green wire on Wrangler) between fuel pump relay connector and splice. Perform VERIFICATION TEST VER-1  .
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