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Home >> Mercury >> 1994 >> Villager LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Delivery >> Fuel Pressure Regulator
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Fuel Pressure Regulator

  1. Ensure ignition is off. Connect fuel pressure gauge in fuel line between fuel filter and fuel rail. Ensure drain valve is closed. Monitor fuel pressure gauge. Start engine and operate for 10 seconds. Stop engine and wait 10 seconds. Start engine and operate 10 seconds. Stop engine.
  2. Remove pressure regulator vacuum hose. Check vacuum port for fuel. If fuel is present, replace fuel pressure regulator and repeat test. If fuel is not present, connect vacuum pump to vacuum port. Apply 20 in. Hg. to vacuum port. Fuel pressure should drop when vacuum is applied. If fuel pressure does not drop when vacuum is applied, replace fuel pressure regulator.
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