LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 1985 >> Impala 5.0 H >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Diesel >> Testing >> Fuel Pump
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Fuel Pump

  1. Disconnect fuel line between fuel pump and filter. Place end of fuel line in measuring container.
  2. Turn ignition switch to "RUN" position. Pump should supply 1/2 pint (1/5 L) in 15 seconds. If not, disconnect inlet hose at pump and connect a vacuum gauge.
  3. Turn ignition switch to "RUN" position. Vacuum must be 5.3 in. Hg. If less, replace pump. If more, check fuel lines for splits, leaks, or kinks.