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Sounds almost like a vapor lock in the fuel line, but in modern cars that wouldn't be my first suspect. That usually happened with the old metal fuel lines and usually only in hot weather. Since you have modded it, you might want to check to make sure that the fuel line is tight at all connections to make sure it can't suck air into the line. Next in my mind would be the fuel pump and the delivery system. Not that familiar with the vehicle's electronics, but there is probably a fuel pressure sensor. That sensor likely controls a relay switch which switches power to the fuel pump. When the sensor senses a drop in pressure, it should tell the relay to turn on and make the fuel pump run. Either the relay or the sensor could be culprits as well and would probably be cheaper than replacing the fuel pump. You'll have to spend some time diagnosing it.
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