LEMON Manuals: Even more car manuals for everyone
Home >> Oldsmobile >> 1978 >> Custom Cruiser 5.7L Eng VIN N >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Diesel Fuel Injection >> Testing >> Fuel Pressure

Fuel Pressure

  1. Remove air crossover assembly. Install Screened Covers (J-26996-2) over openings in intake manifold. Remove pressure tap plug from injection pump. See Fig. 1  .
  2. Place seal from pressure tap plug onto Pressure Tap Adapter (J-28526). Screw adapter into pump in place of plug. Connect a low pressure gauge to adapter. Install magnetic pickup tachometer.
  3. Start engine. Run engine at 1000 RPM with transmission in Park. Observe gauge. Pressure should be 8-12 psi with no more than 2 psi fluctuation. If pressure is incorrect, replace fuel return line connector assembly.
  4. Recheck pressure. If pressure is still not correct, remove injection pump for repair. Pump must be exchanged for another unit. See INJECTION PUMP  removal and installation procedures in this article.
  5. Remove tachometer, pressure gauge and adapter. Install a new pressure tap plug seal on plug. Install tap plug into pump. Remove screened covers from manifold. Install air crossover assembly.
scientia non olet · About LEMON Manuals