Car started one morning then just turned off, cranked again and ran for about 30 secs then shut down. i tested main relay and it was bad, bought new one and even tested the new relay, and its good. Car still wont turn on. checked fuses and are good. checked fuses 31 and 24 and good. checked power at fuel pump and dont get any voltage. did a continuity test from neg terminal of fuel pump harness to body of car and get continuity, making me think that the ground wire is ok. used a jumper wire on main relay plug from 1 to 7 and pump turns on. also used a jumper on 5 to 7 on main relay plug and pump turns on. other thing im thinking is the ECU. Please help me.