View Full Version : s13 fuel pump not kicking on with rb25
dreamin240sx
06-01-2012, 01:34 PM
hey guys yesterday i got my rb running and it ran great. i haven't drove it since i just finished getting the motor in the car and running. well today i get up and go outside so i can get started on finishing everything up. went to start it and all it did was roll over. so i went ahead and starting checking all of the spark plugs and they were alil bit wet so i decided ill let them air out. also i figured i would go ahead and unplug the fuel pump and roll it over so i could blow any unwanted fuel out of the cylinders. so i proceeded to do so but after i went ahead and put all the spark plugs back in and hooked everything back up i tried to start it but i noticed the fuel pump wasn't priming. so i thought i forgot to hook it back up but when i checked it was good. i've checked every fuse and replaced the fuel relays but still nothing!!! the fuel pump is still not priming:eek2: so please if you guys could help me i would be greatly appreciated.. also i have a wiring specialist harness so i didn't have any wiring done by myself thanks again guys
2.5T_/<ouki
06-01-2012, 02:29 PM
Take a MM and check for power at the fuel pump wire .
dreamin240sx
06-01-2012, 04:04 PM
yes sir the plug has power
Sileighty_85
06-01-2012, 04:12 PM
Manually apply 12Vs to the pump to see if its not dead.
dreamin240sx
06-01-2012, 04:29 PM
i got the pump to come on just now i had to make a jumper for the relay. so im thinking it has something to do with the ecu maybe? also i let the pump run and tried to start it and it just rolled over.. which is confusing to me only because i had it running for 30 mins or so last night and ran great but this morning wouldn't fire at all.
RickyS13.
06-01-2012, 04:37 PM
Pull the pump out of the gas tank and with key on "ON" check to see if it comes on by wiggling the power wire attached to the pump. Mine played peek a boo with me and it was not fun. It wasn't my relay/fuses/ecu. Good luck :)
dreamin240sx
06-01-2012, 04:41 PM
ill have to try that i just didnt figure that would be it cause once i made the jumper for the efi relay it stayed on the whole time i had the key on no problem at all
riptor
06-01-2012, 04:54 PM
last time mine did this,it wound up being my ecm bro. dont want to be the bearer of bad news. the EGI relay gets its ground from the ecm. and if a jumper brings the fuel pump to life...well. sadly 2+2=:cry:
dreamin240sx
06-02-2012, 12:12 PM
Ya that's what I was thinking I just don't understand what happend to it. The night before it started and ran fine.
silnv
06-02-2012, 01:46 PM
I had an ecu burn out on me, did the same thing that is happening to you. Caused from the MAFS having a shorted wire. I pulled the ecu cover out and you can see the burnt circuit.
dreamin240sx
06-03-2012, 10:24 AM
ok ill check that out also.. does anybody know where to get an ecu thats not outrageous in price ive been searching for a while but no luck yet?
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