s13 fuel pump not kicking on with rb25 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

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

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=

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?

06-01-2012, 01:34 PM	#1
dreamin240sx Zilvia Junkie Join Date: Aug 2009 Location: west virginia Age: 29 Posts: 530 Trader Rating: (2) Feedback Score: 2 reviews	s13 fuel pump not kicking on with rb25 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 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 __________________ RB POWA!!!!!!!!

06-01-2012, 04:04 PM	#3
dreamin240sx Zilvia Junkie Join Date: Aug 2009 Location: west virginia Age: 29 Posts: 530 Trader Rating: (2) Feedback Score: 2 reviews	yes sir the plug has power __________________ RB POWA!!!!!!!!

06-01-2012, 04:12 PM	#4
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Manually apply 12Vs to the pump to see if its not dead. __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

06-01-2012, 04:29 PM	#5
dreamin240sx Zilvia Junkie Join Date: Aug 2009 Location: west virginia Age: 29 Posts: 530 Trader Rating: (2) Feedback Score: 2 reviews	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. __________________ RB POWA!!!!!!!!

06-01-2012, 04:37 PM	#6
RickyS13. Leaky Injector Join Date: Sep 2010 Location: Phoenix Posts: 100 Trader Rating: (2) Feedback Score: 2 reviews	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 __________________

06-01-2012, 02:29 PM	#2
2.5T_/<ouki Zilvia FREAK! Join Date: Oct 2011 Location: SoCal Posts: 1,150 Trader Rating: (13) Feedback Score: 13 reviews	Take a MM and check for power at the fuel pump wire .

06-01-2012, 04:41 PM	#7
dreamin240sx Zilvia Junkie Join Date: Aug 2009 Location: west virginia Age: 29 Posts: 530 Trader Rating: (2) Feedback Score: 2 reviews	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 __________________ RB POWA!!!!!!!!

06-01-2012, 04:54 PM	#8
riptor Zilvia Member Join Date: Oct 2006 Location: va beach Age: 37 Posts: 241 Trader Rating: (2) Feedback Score: 2 reviews	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= Last edited by riptor; 06-01-2012 at 04:55 PM.. Reason: cuz i can sepll stuufz!

06-02-2012, 12:12 PM	#9
dreamin240sx Zilvia Junkie Join Date: Aug 2009 Location: west virginia Age: 29 Posts: 530 Trader Rating: (2) Feedback Score: 2 reviews	Ya that's what I was thinking I just don't understand what happend to it. The night before it started and ran fine. __________________ RB POWA!!!!!!!!

06-02-2012, 01:46 PM	#10
silnv Zilvia FREAK! Join Date: Dec 2002 Location: Marietta, OH Age: 39 Posts: 1,093 Trader Rating: (39) Feedback Score: 39 reviews	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.

06-03-2012, 10:24 AM	#11
dreamin240sx Zilvia Junkie Join Date: Aug 2009 Location: west virginia Age: 29 Posts: 530 Trader Rating: (2) Feedback Score: 2 reviews	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? __________________ RB POWA!!!!!!!!

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