1990 Chevrolet Cavalier Base, 4D Wagon, 3.1 T, Automatic, 125C/MD9FACTORY OEM SERVICE PROCEDURE

Fuel Pump Test 2

Connect a short section of hose and a vacuum gauge to fuel pump inlet side. Start or crank engine until maximum vacuum reading is obtained. Vacuum reading should be 15 in. Hg.

NOTE: If fuel pump fails both Tests 1 and 2, replace fuel pump. If fuel pump failed Test 1 and passes Test 2, check fuel hoses and replace as necessary. If pump and hoses are okay and fuel delivery is still insufficient, remove fuel tank and inspect fuel tank strainer.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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