i have searched all over every forum i cant find a good answer i just swaped my 1992 240sx with a s13 sr20det black top My fuel pump will not prime if i crank the engine over it starts and dies about 5-10 seconds after it starts if i take the egi relay out of the fuse box and jump the wiring it will prime put not start what so ever would my egi relay be bad Please help

It's quite possible

does that happen normaly when you swap an engine? because my ka24de would prime like 3 weeks ago

When I swapped mine, my alternator was sitting against one of the metal ps lines. This caused it to arc and actually shorted out that relay AND a part of my ECU. I had to get a new relay, then ground it to the chassis to make it work. When I had my rom tune done by JWT, they fixed my ECU, so the ECU now grounds the relay. You may have had something similar happen where you shorted that relay. Out of curiosity, where is your battery?

Also, if your fuel pump is priming, and the car isn't starting, it's unlikely the fuel pump is still your issue. Have you checked the basics? Check fuel at the rail, check spark, check timing, check compression.

i have my battery sitting on my shock tower i havent relocated it I have amazing spark i have compresion timing is good it doesnt have that much fuel pressure unless i jump that relay it doesnt prime the fuel rail what so ever if i crank the engine it sprays a little fuel i have went over wiring like 100 times brand new fuel pump

May have shorted that part of the ECU. Try looking at the relay. (If you understand electronics.) Ground the piece the ECU would normally ground to close the circuit. If you don't understand the way the relay works, don't try this, but if you do, it may be a temporary fix for your problem until you can
A: Get the ECU repaired or...
B: Get a new ECU

If this doesn't fix it, there's a different issue.

if we plug the ecu in my buddys car it fires right up so it isnt the ecu i think i am gonna go over some more wiring andi am gointo nissan tommarow to buy that relay if that dont work im gonna buy a new harness is wiring specialitys ( i think i spelled that wrong) good or not

I'm running a wiring specialties harness in my car

I loved it.. Had to extend the fuel injector wires a little, but that's only because I tucked my wiring...

i will replace my current harness with one of there harnesses as soon as possible

i figured it out i used the sr part or the harness to wire the two plugs by the fuse box

Awesome. How's the car running?

she runs good no temp sensor that plug was cut i do believe once it runs goodies will me added

kohn1988 wrote:i figured it out i used the sr part or the harness to wire the two plugs by the fuse box

thread resurrection!!

I might have the same problem, and I also have a huge battery sitting on the strut tower jumped to the engine block directly.

What do you mean by "wire the to plugs by the fuse box"

Majority of the time, if your fuel pump is not priming, it's the relay... The wires get disconnected under the fuse box. It's typically easiest just to jump the relay. This, of course, means your fuel pump will not shut off once it is primed. (Your fuel pump will continually run if the key is left on.) If that's not the case, try checking the fuses. Another issue I've seen recently in a friend's S13 is the actual plug at the fuel pump making a bad connection. He cut his plugs and hard wired the pump. If you go with the hard wiring option, there is a write-up in the FAQ.