LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1989 >> Forward Control 7.4 W, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - TBI >> System Testing >> Fuel System Pressure Relief
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Fuel System Pressure Relief

  1. On model 700 TBI unit, disconnect 3-terminal electrical connector at fuel tank. Start engine and allow to run until engine stalls due to lack of fuel. Crank engine for 3 seconds to remove any fuel pressure left in fuel lines. Fuel lines are now safe for servicing.
  2. On model 220 TBI unit, fuel pressure is relieved and drops to zero when ignition is turned off. To minimize the risk of fire and personal injury, cover area to be disconnected with a shop rag.
scientia non olet · About LEMON Manuals