Fuel pump no power - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

TupperWare · 06-03-2017, 09:43 PM

(Yes I looked and looked and nobody has had this same issue) I installed a brand new Walbro 255 last night and didn't drive it after words. Today I swapped my cam (Has nothing to do with this but just to know). Took it out for a rip got onto the free way and 3rd gear pull to about 4000 or 4500 rpm. Then the car jolted like I hit the speed limiter but confused as to why it did it in 3rd as such low rpm. So I shifted to 4th slowing down to come off the off ramp and tried to give it throttle. To notice nothing is happening. I push in the clutch to just having the car die. I thought the ignition coil wire came off (It happens sometimes) That didn't happen and found out my fuel pump isn't priming. Tow it home, and pulled the pump thinking it was a bad connection, I rewired it, plugged it in and nothing happened. I put direct power to the pump and worked perfect, I checked the power wire from the female plug off the body harness. And there's no power, there's 2 wire that get around a 6 volt power, but the fuel pump power gets nothing. I check the ecu for a code, it said air intake temp, don't know if has anything to do with it. I checked fuses, they're all fine, checked relay power and jumped the relay and still no power. Any help is appreciated.

derass · 06-03-2017, 10:55 PM

you're on the right track, keep diagnosing that circuit

you said the fuse is good and you jumped the relay, but still no power (at the pump / body connector, I assume)

is the fuse getting power? keep back-tracking that circuit until you get to the battery. somewhere between the battery and fuel pump that circuit is open

TupperWare · 06-03-2017, 11:27 PM

Hmm, didn't think about checking the power at the fuse. I check it out, thanks. Worst case I just hook it to a switch.

*anti tyler* · 06-03-2017, 11:29 PM

Quote:

Originally Posted by TupperWare

Hmm, didn't think about checking the power at the fuse. I check it out, thanks. Worst case I just hook it to a switch.

In my honest opinion, unless you're making your car some sort of track car... there is no direct reason to do that. Fix the problem! don't dodge it!

TupperWare · 06-04-2017, 12:52 PM

Alright so I check power to the fuse and one side is getting 11.55 and the other side is jumping around like crazy (Gets to 120 and keeps jumping around) I don't know if it's supposed to jump around or not. I'm gonna try to test a new ecu and see if that could possibly be the problem before I rip my interior apart. Update: Pulled the driver side carpet up and found the wire (Black and yellow) tested there and still gave no power.

TupperWare · 06-04-2017, 01:47 PM

I found out how to manually trigger the relay and it's still not giving power. Does this eliminate the chance of my ecu being toast? Update: Put straight power into the wire and has power coming off relay, next to the driver seat. But still nothing at the fuel pump plug.

Blk96t · 06-04-2017, 02:56 PM

I actually lost signal just like you.
Sounds like your on the rite track.
I have a trxck car so I used a switch/relay.
If you know where the fuel pump relay is and know it works why not run a new signal wire?

Blk96t · 06-04-2017, 02:58 PM

Probably not the Ecu

TupperWare · 06-05-2017, 12:26 AM

Fixed, turns out someone Did some wiring before me I think for dual pumps and when I installed the new pump I guess i pulled on a crimp connector just enough to run but hit a bump and it fell out. But wired the power wire back together and fixed. Something so dumb.

Mcflurry · 06-05-2017, 08:39 PM

Classic example of previous owner disease.

06-03-2017, 09:43 PM	#1
TupperWare Join Date: Mar 2015 Location: Oregon Age: 24 Posts: 28 Trader Rating: (0) Feedback Score: 0 reviews	Fuel pump no power (Yes I looked and looked and nobody has had this same issue) I installed a brand new Walbro 255 last night and didn't drive it after words. Today I swapped my cam (Has nothing to do with this but just to know). Took it out for a rip got onto the free way and 3rd gear pull to about 4000 or 4500 rpm. Then the car jolted like I hit the speed limiter but confused as to why it did it in 3rd as such low rpm. So I shifted to 4th slowing down to come off the off ramp and tried to give it throttle. To notice nothing is happening. I push in the clutch to just having the car die. I thought the ignition coil wire came off (It happens sometimes) That didn't happen and found out my fuel pump isn't priming. Tow it home, and pulled the pump thinking it was a bad connection, I rewired it, plugged it in and nothing happened. I put direct power to the pump and worked perfect, I checked the power wire from the female plug off the body harness. And there's no power, there's 2 wire that get around a 6 volt power, but the fuel pump power gets nothing. I check the ecu for a code, it said air intake temp, don't know if has anything to do with it. I checked fuses, they're all fine, checked relay power and jumped the relay and still no power. Any help is appreciated.

06-04-2017, 12:52 PM	#5
TupperWare Join Date: Mar 2015 Location: Oregon Age: 24 Posts: 28 Trader Rating: (0) Feedback Score: 0 reviews	Alright so I check power to the fuse and one side is getting 11.55 and the other side is jumping around like crazy (Gets to 120 and keeps jumping around) I don't know if it's supposed to jump around or not. I'm gonna try to test a new ecu and see if that could possibly be the problem before I rip my interior apart. Update: Pulled the driver side carpet up and found the wire (Black and yellow) tested there and still gave no power. Last edited by TupperWare; 06-04-2017 at 02:24 PM..

06-04-2017, 01:47 PM	#6
TupperWare Join Date: Mar 2015 Location: Oregon Age: 24 Posts: 28 Trader Rating: (0) Feedback Score: 0 reviews	I found out how to manually trigger the relay and it's still not giving power. Does this eliminate the chance of my ecu being toast? Update: Put straight power into the wire and has power coming off relay, next to the driver seat. But still nothing at the fuel pump plug. Last edited by TupperWare; 06-04-2017 at 02:41 PM..

06-03-2017, 10:55 PM	#2
derass Zilvia FREAK! Join Date: Jun 2010 Location: Toronto, ON Age: 36 Posts: 1,182 Trader Rating: (0) Feedback Score: 0 reviews	you're on the right track, keep diagnosing that circuit you said the fuse is good and you jumped the relay, but still no power (at the pump / body connector, I assume) is the fuse getting power? keep back-tracking that circuit until you get to the battery. somewhere between the battery and fuel pump that circuit is open

06-03-2017, 11:27 PM	#3
TupperWare Join Date: Mar 2015 Location: Oregon Age: 24 Posts: 28 Trader Rating: (0) Feedback Score: 0 reviews	Hmm, didn't think about checking the power at the fuse. I check it out, thanks. Worst case I just hook it to a switch.

06-04-2017, 02:56 PM	#7
Blk96t Leaky Injector Join Date: Mar 2013 Location: Sioux falls Age: 44 Posts: 52 Trader Rating: (0) Feedback Score: 0 reviews	I actually lost signal just like you. Sounds like your on the rite track. I have a trxck car so I used a switch/relay. If you know where the fuel pump relay is and know it works why not run a new signal wire?

06-04-2017, 02:58 PM	#8
Blk96t Leaky Injector Join Date: Mar 2013 Location: Sioux falls Age: 44 Posts: 52 Trader Rating: (0) Feedback Score: 0 reviews	Probably not the Ecu

06-05-2017, 12:26 AM	#9
TupperWare Join Date: Mar 2015 Location: Oregon Age: 24 Posts: 28 Trader Rating: (0) Feedback Score: 0 reviews	Fixed, turns out someone Did some wiring before me I think for dual pumps and when I installed the new pump I guess i pulled on a crimp connector just enough to run but hit a bump and it fell out. But wired the power wire back together and fixed. Something so dumb.

06-05-2017, 08:39 PM	#10
Mcflurry Join Date: May 2016 Location: Australia Age: 35 Posts: 34 Trader Rating: (0) Feedback Score: 0 reviews	Classic example of previous owner disease.