Merkur Xr4ti L4-140 2.3L SOHC Turbo (1985)
Fuel Pressure: Testing and Inspection
Test 1, High Pressure Fuel Pump Check
1.
Turn ignition key to RUN and listen for high pressure pump to ``buzz up'' to EFI system operating pressure.
2.
Proceed to TEST 2.
Test 2, Low Pressure Fuel Pump Check
1.
Separate wiring connector at high pressure fuel pump, then have assistant turn ignition key to RUN and listen at fuel tank for low pressure pump
buzz.
2.
If fuel pump runs, problem is not in fuel pumps.
3.
If low pressure pump does not run and high pressure pump did not run in TEST 1, proceed to TEST 3.
4.
If low pressure pump does not run, but high pressure pump ran in TEST 1, proceed to TEST 12.
5.
If low pressure pump runs, but high pressure pump did not run in TEST 1, proceed to TEST 15.
Test 3, Inertia Switch Check
Fig. 4 Resetting inertia switch
1.
Locate inertia switch in spare tire well and depress reset button, Fig. 4.
2.
If switch did not require resetting, proceed to TEST 4.
3.
If switch resets, repeat TEST 1 to verify operation of pumps.
Test 4, Fuel Pump Relay Check
