Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Fuel Pressure: Testing and Inspection
Fuel Pump Pressure Test - Fuel Injected
FUEL PRESSURE TEST
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Turn engine "OFF" and perform Fuel Pressure Relief procedure.
CAUTION: A small amount of fuel may be released, after the fuel line is disconnected. In order to reduce the chance of personal injury, cover
the fitting to be disconnected with a shop cloth. Place the cloth in an approved container when disconnect is completed.
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Install fuel pressure gage J-29658A/BT8205, or equivalent, at the outlet side of the in-line fuel filter.
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Start engine and observe fuel pressure reading. It should be 62-90 kPa (9-13 psi).
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Relieve fuel pressure.
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Remove fuel pressure gage.
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Re-install fuel hose or pipe assembly to in-line fuel filter.
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Start engine and check for fuel leaks.
*** THIS PROCEDURE HAS BEEN UPDATED BY TSB # 90-6C-89, Dated 9/90
Some 1985-90 engines equipped with 2.5L, 2.8L, 4.3L, 5.0L, 5.7L or 7.4L may experience a condition where fuel delivery is interrupted to the engine
causing a "no start condition". This condition may be caused by deterioration of the in-tank fuel pump coupler hose located between the fuel pump
sending unit and the fuel pump. This condition may be repaired by replacing the original coupler hose with a new VITON coupler hose kit P/N
25028041. The kit consist of a new VITON hose and two clamps.
