1990 Ford Festiva LFACTORY OEM SERVICE PROCEDURE

Fuel Pressure Check

NOTE: For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article.
  1. Connect fuel pressure gauge between fuel filter and fuel rail with main valve open and drain valve closed. Attach jumper wire between fuel pump test terminals (Black and Green/Red). Fuel pump check connector is located on firewall, under windshield wiper motor. Turn ignition on to activate fuel pump. If pump does not run, check fuel pump circuit.
  2. If possible, start engine. Check and record fuel pressure. Disconnect vacuum from pressure regulator. Check and record fuel pressure again. Turn engine off and disconnect jumper wire at fuel pump check connector. Wait 10 minutes and ensure residual pressure is at least 21 psi (1.5 kg/cm2 ).
  3. Operate fuel pump by jumpering fuel pump test connector. Check fuel pump performance. Pinch hose between pressure gauge and fuel filter. Do not hold longer than necessary to check pressure. See FUEL PUMP PERFORMANCE  . If pump does not meet specifications, check fuel pump circuits, fuel pump, fuel tank, fuel filter or replace fuel pump.
FUEL PUMP PERFORMANCE

Application Pressure psi (kg/cm2 ) Min. Vol. in 30 sec. Pts. (L)
1.3L (1) 2.2 (.9)
(1) For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article.
Fig 1: Fuel System Electrical Schematic
G90A16527Courtesy 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.