Need help! fuel pump not working? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

gary556 · 11-12-2018, 05:34 PM

My fuel pump went bad so I replaced it with a Walbro fuel pump. I followed this guide to find my problems.

http://zilvia.net/f/showthread.php?t=108545

This is my problem now:
I followed this part of the guide:
"Check your fuse pump relay. Remove the relay. When you look at the pins of the relay, each pin is labeled with a number. Use a paper clip and jumper the 1 and 3 terminal on the wiring. If your fuel pump comes on with ignition, you have a bad relay."

I own a 1993 240sx that is manual swapped

Now that I have a working fuel pump, it won't get power. When I jumped terminal 1 and 3 with some alligator clips, it now gets power. I checked my relays and they are all working perfectly. But if jumping it with a clip gets it power, it couldn't be a wiring issue, could it?

I have no idea what the problem could be now, all opinions, input, or questions will help.

EDIT: Just checked the Voltage of the relays and all of them are getting 12.0+ volts while the one giving me problems is getting only 11.5V. Do the relays absolutely need 12V to trigger?

anthony_240 · 11-12-2018, 06:58 PM

You also won’t get power to your pump and distributor if you have a bad eccs relay which on the s14 is right by the ecu, not sure about s13 and also there should be an efi fuse that will also affect power. Good luck

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kyral · 11-18-2018, 08:59 AM

How did you test the relays?

anthony_240 · 11-18-2018, 09:54 PM

Quote:

Originally Posted by kyral

How did you test the relays?

Test light. Or if you don’t have one, switch it with a known working relay

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apex · 11-20-2018, 04:31 PM

Had the same problem
Mine ended up being the wire on top of the pump
Came off
I think there 3or 4 wires top of the fuel pump
Assembly

240KA · 11-20-2018, 05:17 PM

my fuel pump wouldn't prime when i would key on
come to find out, one of the wires on the underside of the fuel pump hanger was loose. the 3 or 4 wires under there look like they're riveted on from factory (i only glanced at them while the homie soldered the connection), but they resemble a rivet. solder the loose connection and fuel pump would prime again.

gue399108 · 07-05-2020, 05:02 PM

I have this issue. The wires on top of the fuel pump sending unit, the black one came off but I went to go ground it to the screw of the cap and pump won’t turn on. Any suggestions?

S14rebuild · 07-05-2020, 05:51 PM

The black one needs to be connected to the pump that is the ground.

11-12-2018, 05:34 PM	#1
gary556 Join Date: Sep 2018 Location: Orlando, FL Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	Need help! fuel pump not working? My fuel pump went bad so I replaced it with a Walbro fuel pump. I followed this guide to find my problems. http://zilvia.net/f/showthread.php?t=108545 This is my problem now: I followed this part of the guide: "Check your fuse pump relay. Remove the relay. When you look at the pins of the relay, each pin is labeled with a number. Use a paper clip and jumper the 1 and 3 terminal on the wiring. If your fuel pump comes on with ignition, you have a bad relay." I own a 1993 240sx that is manual swapped Now that I have a working fuel pump, it won't get power. When I jumped terminal 1 and 3 with some alligator clips, it now gets power. I checked my relays and they are all working perfectly. But if jumping it with a clip gets it power, it couldn't be a wiring issue, could it? I have no idea what the problem could be now, all opinions, input, or questions will help. EDIT: Just checked the Voltage of the relays and all of them are getting 12.0+ volts while the one giving me problems is getting only 11.5V. Do the relays absolutely need 12V to trigger? Last edited by gary556; 11-12-2018 at 08:34 PM.. Reason: more information

11-18-2018, 08:59 AM	#3
kyral Zilvia Junkie Join Date: Nov 2012 Location: wisconsin Age: 29 Posts: 447 Trader Rating: (7) Rides Gallery: kyral Feedback Score: 7 reviews	How did you test the relays? __________________ The Game you lose haha

11-20-2018, 04:31 PM	#5
apex Zilvia FREAK! Join Date: Aug 2004 Location: palm springs Posts: 1,566 Trader Rating: (44) Feedback Score: 44 reviews	Had the same problem Mine ended up being the wire on top of the pump Came off I think there 3or 4 wires top of the fuel pump Assembly __________________ Red Rocket

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11-12-2018, 06:58 PM	#2
anthony_240 Zilvia Junkie Join Date: Nov 2016 Location: Los Angeles Age: 30 Posts: 489 Trader Rating: (3) Feedback Score: 3 reviews	You also won’t get power to your pump and distributor if you have a bad eccs relay which on the s14 is right by the ecu, not sure about s13 and also there should be an efi fuse that will also affect power. Good luck Sent from my iPhone using Tapatalk

11-20-2018, 05:17 PM	#6
240KA Zilvia Addict Join Date: Mar 2008 Location: OK Age: 37 Posts: 805 Trader Rating: (6) Feedback Score: 6 reviews	my fuel pump wouldn't prime when i would key on come to find out, one of the wires on the underside of the fuel pump hanger was loose. the 3 or 4 wires under there look like they're riveted on from factory (i only glanced at them while the homie soldered the connection), but they resemble a rivet. solder the loose connection and fuel pump would prime again.

07-05-2020, 05:02 PM	#7
gue399108 Join Date: Jan 2012 Location: Chicago, IL Age: 29 Posts: 19 Trader Rating: (0) Feedback Score: 0 reviews	I have this issue. The wires on top of the fuel pump sending unit, the black one came off but I went to go ground it to the screw of the cap and pump won’t turn on. Any suggestions?

07-05-2020, 05:51 PM	#8
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	The black one needs to be connected to the pump that is the ground.