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The ECU controls the fuel pump relay (green wire if i remember correctly). If the engine runs when the pump is wired directly, chances are it is a relay or a wiring problem.
Anyway, if you get blown fuses problems, you might want to investigate them ...
there is a known problem with aftermarket fuel pumps on S13/14 chassis, the wires from the relay to the pump are too thin and need replacing. You can easily check this with a voltmeter, when it happens voltage at the pump is lower than voltage at battery (like 10V or less instead of 14)
edit : it reminds me of another known "electrical" problem : lowered S and Z chassis tend to munch through the electrical harness that pass just up the front tyres (unless you relocate it). Worth checking too ...
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