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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 under FUEL SYSTEM TESTS in this article. 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 vacuum port for fuel.
  2. If fuel is present, replace fuel pressure regulator. If not, start and operate engine for 30 seconds. Stop engine and check fuel pressure gauge. If gauge drops more than 5 psi 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 drops more than 5 psi 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 in 30 seconds, replace fuel pressure regulator.
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