Fuel Pressure: Testing and Inspection

Fuel System Pressure Test

Several system checks and diagnosis require observing the fuel system pressure. This test provides a visual fuel pressure reading.

1. Turn engine "OFF" and relieve fuel pressure.

CAUTION: A small amount of fuel may be released, after the fuel line is disconnected. In order to reduce the chance of personal injury, cover the fitting to be disconnected with a shop cloth. Place the cloth in a approved container, when disconnect is completed.

2. Remove air cleaner, adapter, and gaskets, and plug TERMAC vacuum port on TBI 700 unit.






























3. Install fuel pressure gage J-29658A/BT8205, or equivalent, at the outlet side of the in-line fuel filter.

Measure
- Start engine and observe fuel pressure reading. It should be 62-90 kPa (9-13 psi); if not, refer to CHART A-6 Chart A-6 Fuel System Pressure Test.

4. Relieve fuel pressure.
5. Remove fuel pressure gage.
6. Re-install fuel hose, or pipe assembly, to in-line fuel filter.
7. Start engine and check for fuel leaks.
8. Remvoe plug covering THERMAC vacuum port, on TBI 700 unit, and install air cleaner.