Wrangler L4-150 2.5L VIN P MFI (1993)
9. Check the fuel pump flow rate (capacity). Refer to Fuel Pump Capacity Test. A good fuel pump will deliver at least 1 liter of fuel per minute with
the hose section of fuel return line pinched off. If the fuel pump does not pump adequately, inspect the fuel system for a plugged fuel filter or the
filter sock (at the fuel pump inlet).
10. Fuel pump flow rate can be checked with and old air conditioning gauge hose. Connect one end of the hose to the fuel test port on the fuel rail.
Place the other end of the hose into a container of at least 1 liter capacity. Run the fuel pump by installing a jumper wire across the power feed side
of the fuel pump relay connector. Be sure to pinch off the hose section of the fuel return line, or most of the fuel will be returned to the fuel tank.
NOTE: The fuel pressure regulator is not adjustable.
