Fuel Pressure
- On RX7, disconnect fuel pump connector at shock tower in trunk.
- Turn ignition on. Using a jumper wire, connect terminals of Yellow fuel pump check connector together. Fuel pump check connector is located on firewall, near airflow sensor on RX7. If pump runs, check fuel pump circuit, circuit opening relay and fuel pump resistor on RX7.
- If possible, start engine. Check fuel pressure with vacuum connected to and disconnected from pressure regulator. Turn engine off and disconnect jumper wire at fuel pump check connector. Wait 10 minutes and ensure residual pressure is at least 21 psi (1.5 kg/cm2 ).
- Operate fuel pump by jumpering fuel pump test connector. Check fuel pump performance. Pinch hose between pressure gauge and fuel filter. Do not hold longer than necessary to check pressure. See FUEL PUMP PERFORMANCE table. If pump does not meet specifications, check fuel pump circuits, fuel pump, fuel tank, fuel filter or replace fuel pump.
FUEL PUMP PERFORMANCE
| Application | Pressure psi (kg/cm2 ) | Min. Vol. in 30 sec. Pts. (L) |
|---|---|---|
| Non-Turbo | 64-85 (4.5-6.0) | 1.37 (.65) |
| Turbo | 71-92 (5.0-6.5) | 2.24 (1.0) |
REGULATED FUEL PRESSURE
| Application | w/Vacuum psi (kg/cm2 ) | w/o Vacuum psi (kg/cm2 ) |
|---|---|---|
| RX7 | 27-33 (1.9-2.3) | 34-40 (2.4-2.8) |