fuel pump prime/ wiring schemtic

[89s13silvia]

Ok so im having fuel pump problems and my pump doesn't want to prime. It doesn't give the steady hmm it would normally. I replaced the pump but still the same thing(needed a 255 anyway) took it for a drive then parked it and it would'nt start agan.

Is the priming controlled by the ecu?

if I ran my own relay would i be able to run to ignition or would that damage the pump to sit and run?

the previous pump was wired in with a larger ground cable going from the red/blue wire to the pump cover for extra ground. Is the red blue not normally the power wire?

pump is good

let me know what you think and if anyone has a fuel system wiring schematic?


thanks