Fuel Pressure Test
Relieve Fuel Pressure. Plug thermac vacuum port on TBI (if equipped). Disconect flexible fuel hose and install pressure gauge. Start engine and observe fuel pressure. See FUEL PUMP SPECIFICATIONS table. Relieve fuel pressure. Remove pressure gauge and reconnect fuel line using new "O" ring.
NOTE:
The 7.4L (VIN W) carbureted engine uses a mechanical fuel pump.
FUEL PUMP SPECIFICATIONS
| Application | Pressure psi (kg/cm2) | Volume Pts. (L) In. 15 Sec. |
|---|---|---|
| 5.0L, 5.7L & 7.4L (VIN N) | 9-13 (.63-.91) | N/A |
| 7.4L (VIN W) | 4-6.5 (.3-.5) | .5 (.2) |