Impulse Coupe L4-1588cc 1.6L DOHC Turbo (4XE1-WT) (1992)
Diagnostic Chart A-7 Fuel Pressure Test
CIRCUIT DESCRIPTION:
The fuel pump delivers fuel to the fuel rail and injectors, where the system pressure is controlled from 274-324 kPa (39.7-47.1 psi) by the pressure
regulator. Excess fuel is returned to the fuel tank. When the engine is stopped, the pump can be energized by jumping the fuel pump relay connector with
a fused lead.
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
1.
Use pressure gauge J 34730-1 and adapter J 35957-10. Wrap a shop towel around the fuel pressure tap to absorb any small amount of fuel leakage
that may occur when installing the gauge. (The pressure will not leak down after the fuel pump is stopped on a correctly functioning system).
2.
While the engine is idling, manifold pressure (vacuum) is low. When applied to the fuel regulator diaphragm, the pressure will result in a lower