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Home >> GMC >> 1987 >> Forward Control 6.2 J, Automatic, 400/M40 >> Repair and Diagnosis >> Engine Performance >> System >> CCC TBI Tests W/Codes >> Diagnostic Charts >> Chart A6 - Fuel System Pressure Test >> Circuit Description

Circuit Description

When fuel pump is running, fuel is delivered to injector(s) and then to pressure regulator where system pressure is maintained at about 9-13 psi (.63-.91 kg/cm2 ). Excess fuel is returned to fuel tank.