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Home >> Ford >> 1990 >> Bronco II RWD, Standard, M5OD-R1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System Checks >> Fuel Pressure Regulator
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Fuel Pressure Regulator

NOTE: For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article.
  1. Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  . Connect fuel pressure gauge at Schrader valve. Start and operate engine for 10 seconds. Stop engine for 10 seconds. Start and operate engine for 10 seconds. Stop engine and remove pressure regulator vacuum hose. Check for fuel at vacuum port.
  2. If fuel is present, replace fuel pressure regulator. If fuel is not present, start and operate engine for 30 seconds. Stop engine and check fuel pressure gauge. If gauge reading drops more than 5 psi (.35 kg/cm2 ) in 60 seconds, disconnect and plug fuel return line at engine. Start and operate engine until normal fuel pressure is obtained.
  3. Stop engine and check fuel pressure gauge. If gauge reading drops more than 5 psi (.35 kg/cm2 ) in 30 seconds, replace high pressure fuel pump (dual pump system) or fuel sender/pump assembly (single pump type). If gauge does not drop more than 5 psi (.35 kg/cm2 ) in 30 seconds, replace fuel pressure regulator.
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