Fuel Pump not coming on...

SikSilvrSuby · 06-04-2010, 03:58 PM

i have an 05 wrx that i just swapped my buddys 02 wrx motor into... motors in great shape, etc.... the fuel pump will not kick on whatsoever. I replaced the pump with another W255... i feel the relay under the dash kicking on, i checked all the harness connections and connectors, theyre all in good shape, and the ignition powers everything else on, just not the fuel pump. any suggestions??? oh yeah and at the fuel filters everythings dry, theres no fuel in the lines so the motor is 100% not gettin fuel.

thanks

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DeatschWerks · 06-04-2010, 07:46 PM

Time to grab a volt-meter! Check to see if you are getting power at the plug near the gas tank. The relay might be switching, but it's possible something else is interrupting the connection.

SikSilvrSuby · 06-04-2010, 09:46 PM

i had the volt meter out. i was getting 6 volts at the pump through the plug on the top cover. or something along those lines. apparently theres a relay for the fuel pump in the trunk passenger side as well...i was trying to find it..no luck. so im thinking i got a ground issue or a pcm issue.. since all the fuses are good. im thinking about running power and ground jumper wires along the interior like the harness is and splicing it with an accessory wire so the pumps only on in the key on position. easier than chasing a wire for a break or something.

paintbing · 06-05-2010, 12:04 AM

Whenever I need to disconnect the fuel pump, I always disconnect the big brown wire harness below the glove box (next to the door).

Make sure your friend didn't disconnect this and not tell you.

SikSilvrSuby · 06-05-2010, 08:39 AM

nah man...its all connected.. wtfffffffffff

Haelan · 06-06-2010, 12:14 AM

Fuel pump controller would be another item to check. Located behind trunk liner on passenger side.

Edit: The service manual has more info on reading the voltages on the controller terminals; what to expect, etc. Check all your fuses as well (SBF-5 is power to the fuel pump controller). The ECU dictates the fuel pump duty cycle. If it is sending 0% for some reason the pump will not cycle.

96accord · 06-08-2010, 12:26 PM

SikSilvrSuby: any updates?

I'm having similar problems

chodezilla · 08-17-2010, 05:04 PM

I'm with 96accord on this one. Any updates? I know it's been a few months, but I have the same problem (6v at the plug and the pump doesn't turn on) and wanted to know if you got it working.

goat630 · 08-17-2010, 06:27 PM

bad ground after the pump. if your getting power to the pump its most likely a ground issue.

06-04-2010, 03:58 PM	#1
SikSilvrSuby Scooby Specialist Member#: 193569 Join Date: Nov 2008 Chapter/Region: Tri-State Location: Dirty Jersey Vehicle: 2006 Wrx CGM Last Minute Motorsports	Fuel Pump not coming on... i have an 05 wrx that i just swapped my buddys 02 wrx motor into... motors in great shape, etc.... the fuel pump will not kick on whatsoever. I replaced the pump with another W255... i feel the relay under the dash kicking on, i checked all the harness connections and connectors, theyre all in good shape, and the ignition powers everything else on, just not the fuel pump. any suggestions??? oh yeah and at the fuel filters everythings dry, theres no fuel in the lines so the motor is 100% not gettin fuel. thanks * Registered users of the site do not see these ads.

06-06-2010, 12:14 AM	#6
Haelan Scooby Specialist Member#: 151045 Join Date: Jun 2007 Location: NW Indiana Vehicle: 2013 Subaru STI CBP	Fuel pump controller would be another item to check. Located behind trunk liner on passenger side. Edit: The service manual has more info on reading the voltages on the controller terminals; what to expect, etc. Check all your fuses as well (SBF-5 is power to the fuel pump controller). The ECU dictates the fuel pump duty cycle. If it is sending 0% for some reason the pump will not cycle. Last edited by Haelan; 06-06-2010 at 12:27 AM.

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06-04-2010, 07:46 PM	#2
DeatschWerks NASIOC Manufacturer Member#: 87358 Join Date: May 2005 Chapter/Region: TXIC Location: Oklahoma City	Time to grab a volt-meter! Check to see if you are getting power at the plug near the gas tank. The relay might be switching, but it's possible something else is interrupting the connection.

06-04-2010, 09:46 PM	#3
SikSilvrSuby Scooby Specialist Member#: 193569 Join Date: Nov 2008 Chapter/Region: Tri-State Location: Dirty Jersey Vehicle: 2006 Wrx CGM Last Minute Motorsports	i had the volt meter out. i was getting 6 volts at the pump through the plug on the top cover. or something along those lines. apparently theres a relay for the fuel pump in the trunk passenger side as well...i was trying to find it..no luck. so im thinking i got a ground issue or a pcm issue.. since all the fuses are good. im thinking about running power and ground jumper wires along the interior like the harness is and splicing it with an accessory wire so the pumps only on in the key on position. easier than chasing a wire for a break or something.

06-05-2010, 12:04 AM	#4
paintbing Scooby Specialist Member#: 59388 Join Date: Apr 2004 Chapter/Region: RMIC Location: Utah --> Monterey, CA Vehicle: 2003 WRX - Hybrid I do my own stunts	Whenever I need to disconnect the fuel pump, I always disconnect the big brown wire harness below the glove box (next to the door). Make sure your friend didn't disconnect this and not tell you.

06-05-2010, 08:39 AM	#5
SikSilvrSuby Scooby Specialist Member#: 193569 Join Date: Nov 2008 Chapter/Region: Tri-State Location: Dirty Jersey Vehicle: 2006 Wrx CGM Last Minute Motorsports	nah man...its all connected.. wtfffffffffff

06-08-2010, 12:26 PM	#7
96accord Scooby Guru Member#: 145105 Join Date: Apr 2007 Chapter/Region: MAIC Location: Maryland Vehicle: 2007 WRB WRX Limited	SikSilvrSuby: any updates? I'm having similar problems

08-17-2010, 05:04 PM	#8
chodezilla Scooby Newbie Member#: 130374 Join Date: Oct 2006 Chapter/Region: SCIC Location: Topanga, CA Vehicle: 2000 rSTi BRP	I'm with 96accord on this one. Any updates? I know it's been a few months, but I have the same problem (6v at the plug and the pump doesn't turn on) and wanted to know if you got it working.

08-17-2010, 06:27 PM	#9
goat630 Scooby Newbie Member#: 214779 Join Date: Jun 2009 Chapter/Region: NESIC Location: Maine Vehicle: 2004 wrx Mr. San Remo	bad ground after the pump. if your getting power to the pump its most likely a ground issue.