hey calum,
i have an s13 black top ecu the e5 an it will not turn on my fuel pump i looked at you post on replacement parts an i was wondering where exactly is it located on the ecu an is it that hard to replace, also i was just gonna send u my ecu to have u put in a daughter board how much extra to fix the fuel pump issue as well as a basic board? thanks matt

I don't have an E5 ECU in stock so I can't answer that question, but you can with a multimeter. Just follow the pin for the fuel pump relay back to whatever the part is that controls it. Put your multimeter on beep mode (continuity check) and trace it back, it's dead easy to do. If the part is a discrete driver (3 pin part) like the B13/S13 it's dead easy, if it's been rolled into a array (long part with multiple pins) it's trickier to replace, but still not that bad.

well i really don't have time to try an figure that out, i was plan on sendin the ecu to you to have the daughter board put in, how much extra would it be to have u look at the fuel pump issue for me?