4 Runner 2WD L4-2693cc 2.7L DOHC MFI (1997)
Fuel Pressure: Testing and Inspection
FUEL PRESSURE INSPECTION
(a) Check that the battery positive voltage is above 12 volts.
(b) Disconnect the negative (-) terminal cable from the battery.
(c) Remove the union bolt and 2 gaskets, and disconnect the fuel inlet pipe from the delivery pipe.
HINT:
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Put a suitable container or shop rag under the delivery pipe.
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Slowly loosen the union bolt.
(d) Install the fuel inlet pipe and SST (pressure gauge) to the delivery pipe with the 3 gaskets and SST (union bolt). SST O9268-45012
Torque: 29 N.m (300 kgf.cm, 22 ft.lbf)
(e) Wipe off any splattered gasoline.
(f) Connect the TOYOTA hand-held tester to the DLC3.
(g) Reconnect the negative (-) terminal cable to the battery.
(h) Turn the ignition switch ON.
(i) Measure the fuel pressure,
Fuel pressure: 265 - 304 kPa
(2.73.1 kgf/sq. cm, 38 - 44 psi)
If pressure is high, replace the fuel pressure regulator.
If pressure is low, check these parts:
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Fuel hoses and connections
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Fuel pump
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Fuel filter
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Fuel pressure regulator
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Injectors
(j) Disconnect the TOYOTA hand-held tester from the DLC3.
(K) Start the engine.
(I) Measure the fuel pressure at idle.
Fuel pressure: 206 - 255 kPa
(2.1 - 2.6 kgf/sq. cm, 31 - 37 psi)
If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.
(m)Stop the engine.
(n) Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.