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Home >> Pontiac >> 1988 >> LeMans SE, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - TBI >> Testing >> Fuel System Pressure Test

Fuel System Pressure Test

NOTE: For diagnostic flow charts see appropriate article in COMPUTERIZED ENGINE CONTROLS section.
  1. To relieve any residual system pressure, remove fuel pump fuse from fuse block in passenger compartment. Start and run engine until fuel supply remaining in fuel lines is used. Engage starter again for about 3 seconds. Turn ignition off and reinstall fuse.
    WARNING: Always relieve residual pressure in fuel delivery system before opening system. To prevent chance of personal injury cover fittings with shop towel while disconnecting fittings.
  2. Remove air cleaner and plug air cleaner (THERMAC) vacuum port on throttle body. Remove steel fuel line between throttle body and fuel filter. When removing fuel line, always use 2 wrenches to prevent damage. Install fuel pressure gauge between throttle body and fuel filter.
  3. Start vehicle and observe fuel pressure reading. Fuel pressure should be 9-13 psi (.6-.9 kg/cm2 ). If fuel pressure is not within specifications, go to CHART A-7 in appropriate article in COMPUTERIZED ENGINE CONTROLS section.
  4. Relieve residual pressure as described in step 1). Remove fuel pressure gauge. Reinstall steel line between filter and throttle body. Start engine and watch for leaks. Remove plug from throttle body thermal vacuum port and reinstall air cleaner.
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