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Old 09-20-2016, 04:22 AM   #1
Scooby Newbie
Member#: 449134
Join Date: Jun 2016
Default Fuel Pump Does Not Stop Priming In On Position

So my car does this weird thing when I move the key to the on position, before starting the car, the fuel does not cut off after initial prime. If I let it go long enough, I get a huge puff of smoke at start. I do think my car is running a little rich, but that's besides the point.

Any suggestions? Tips? Guidance?
Any help is appreciated.

2006 WRX GGG
Protuned, etc
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Old 09-20-2016, 09:00 AM   #2
Scooby Newbie
Member#: 452491
Join Date: Aug 2016
2009 Impreza WRX


Not very familiar with this system,

But in my experience that's a bad relay. I've had one before get stuck in the "on" position indefinitely. I would see if something like that is the cause.
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Old 09-24-2016, 12:34 PM   #3
Scooby Newbie
Member#: 433352
Join Date: Nov 2015
Chapter/Region: MWSOC
Location: Louisville, KY
2009 WRX Hatch

Default Fuel Pump Does Not Stop Priming In On Position

Not 100% sure of the location/operation of the test mode connector on the 06. However, on my 09 the fuel pump will constantly prime, radiator fans kick on and off and relays constantly click when the test mode is engaged. On another note poor grounding, defective FPR, leaking injector, bad fuel pump o-ring can all cause a fuel pump to continuously cycle. Have you checked your fuel pressure to see if its holding?

Last edited by Slow-09-WRX-Hatch; 09-24-2016 at 12:43 PM.
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Old 09-24-2016, 01:07 PM   #4
Scooby Guru
Member#: 22412
Join Date: Aug 2002
Chapter/Region: SWIC
Location: Albuquerque, NM
2012 Legacy 2.5GT
Ice Silver Metallic


the fuel pump stops when it hits a target pressure (it's pressurizing the lines, not priming them - they are already full of fuel) - what does your fuel pressure look like? could be fuel pressure regulator or an issue with the pump. Maybe it's over-pressurizing the system so when you start after letting it build for a little while, you get too much fuel past the injectors and it runs really rich? what color is the smoke?
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