1990 Ford Probe LX, AutomaticFACTORY OEM SERVICE PROCEDURE

Fuel Pump Pressure (PFI Systems)

NOTE: For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article.
  1. On 2.2L & 2.2L Turbo models, relieve fuel line pressure by disconnecting fuel pump relay and starting engine. After engine stalls, turn ignition off. Reconnect fuel pump relay.
  2. On all other models, remove fuel tank cap. Using Fuel Pressure Gauge (T80L-9974-B), release pressure from system at pressure relief valve (Schrader valve) on fuel injection manifold rail.
  3. The fuel pump may be activated by grounding the fuel pump lead at the SELF-TEST connector. Use a jumper lead and ground the "FP" terminal with the ignition on. This activates the fuel pump. See Fig 1 . For additional circuit test information, see appropriate TESTS W/CODES article in this section.
Fig 1: PFI Fuel Pump & SELF-TEST Connector
G54331Courtesy of FORD MOTOR CO.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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