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Home >> Jeep >> 1991 >> Cherokee Limited >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Fuel System >> Deadhead Pressure (2.5L & 4.0L)

Deadhead Pressure (2.5L & 4.0L)

  1. Relieve fuel pressure. See FUEL PRESSURE RELEASE (2 .5L & 4.0L). Connect a 0-60 psi (0-4.2 kg/cm2 ) fuel pressure gauge to the pressure test port fitting on fuel rail.
  2. Remove fuel pump relay (located in power distribution center). Using a jumper wire, connect terminals No. 30 and 87. See Figure. Note fuel pressure gauge, and momentarily pinch fuel return line.
  3. Fuel pressure should be at least 53 psi (3.7 kg/cm2 ). DO NOT  allow pressure to exceed 60 psi (4.2 kg/cm2 ). Release fuel return line.
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