LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1987 >> Forward Control 4.8 T, Standard >> Repair and Diagnosis >> Engine Performance >> System >> CCC TBI Tests W/Codes >> Diagnostic Charts >> Chart A6 - Fuel System Pressure Test >> Circuit Description
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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.