• Perform low pressure checks (3C-19) before
performing checks on high pressure route.
• Install fuel pressure gauge (P/N 91-16850A2)
on to manifold pressure port.
• Place ignition switch in “OFF” position 30 sec-
onds before testing.
• Place ignition switch in “ON” position and note
pressure within 30 seconds (36 to 39 psi; 248 to
269 kPa).
No or low fuel pressure Pump does not runFuel pressure above 39 psi (269 kPa)
Perform Final Filter Check
(page 3C-26).
Clogged or faulty fuel pressure
regulator remove and replace.
Perform Electric Fuel Pump “Pro-
cedure B” Test (page 3C-28).
Final filter OK. Final filter clogged.
Perform Fuel Pressure Regula-
tor Test (page 3C-27).
Clean or replace final filter.
Steady stream of fuel (pressure
still below 36 psi).
Low or no fuel flow.
Replace fuel regulator.
Perform Electric Fuel Pump Test
(page 3C-28).
Voltage from ECM driver circuit
OK.
Low or inconsistent voltage from
ECM driver circuit.
Replace fuel pump. Replace ECM.
Results Results
Results
Results
Results
Results
3C-20 - FUEL SYSTEMS 90-824052R3 JUNE 2002
EFI Fuel Management (High
Pressure Fuel Route)
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