Get engine good and hot. Turn off ignition. Remove air intake from throttle body. Block throttle wide open. Wait long enough for all fuel odor in the intake manifold to dissapate. (use your nose and sniff). Turn on the ignition to activate the fuel pump and pressure up the injectors. If any are leaking you should be able to smell it. Turn the ignition off and on every couple minutes to keep the pressure up. On my '95 Tracker the pump runs for 5 seconds and turns off if the engine isnt running.