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first off...AM YISRAEL CHAI ^_^
second off, lol, the fuel pump relay wire should be black with a pink stripe and the ecu gives that wire a GROUND signal to the relay when you turn the key to igntion ON position for the first 5 seconds. then it will give that wire a solid ground signal as it sees the engine rotating via the cam angle sensor during starting and operation. the ecu gives the black/pink wire ground, the relay clicks completing the circuit, thus giving the fuel pump's positive wire the 12 volts, i believe the pumps positive wire should be black/yellow at the top on that plug that plugs into the fuel sender.
i don't know what you mean by pin 5 cause whether you're calling pin 5 something off the dash plug or the ecu, for either an s13, s14, or s15 sr20det, pin 5 has nothing to do with fuel at all.
the wire you want is BLACK with a PINK stripe. for an s13 sr20det it'd be on the brown f10 connector that runs by the battery on an s13 which corresponds with pin #104 on the s13 sr20's ecu. if you're using an s14 sr20motor/ecu it'd be pin #18 on the ecu and in that case it may be black/pink or black/yellow depending on what you have.
remove pin #5 from this scenario. wire in the correct fuel pump relay wire into your car/dash plug. if you cannot figure it out, don't fry anything and listen to another Yid. do it like this..
get a 4 leg 12volt 20 or 30 amp relay from the parts store. usually how they have it set up is leg 1 and 2 have a picture with a pubic hair inbetween them. on 1 put an ignition sourced 12volt and on 2 put the black with pink wire, now you have 2 legs left, usually it'll be 3 and 5 but in any case, it'll look like a door that if it's shut it would connect 3 to 5, but with the relay deactivated 5 should be completely dead. T off of the 12volt ignition wire that you ran to leg 1 and run that to 3 also, then for 5, run your own wire to the fuel pump's positive wire.
congratulations, you have now bipassed your stock fuel pump wiring that's all screwed up
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