dp213 Posted December 26, 2016 Share Posted December 26, 2016 I have put 2 fuel pumps in my son's 02 WRX in the last year and it's dead again. The last one I put in was a walbro 255 lph pump. Is there something that could be causing these failures. Thanks Dp Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted December 26, 2016 Share Posted December 26, 2016 Low voltage, a restriction in a fuel line, or contamination of the fuel would be my only guesses. The walbros seem to have a good reputation so it sounds a little odd for that brand to fail. Any other brand besides an OEM I would not put much trust in. Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted December 27, 2016 Share Posted December 27, 2016 does he run pump gas or use exotic fuels or additives? doe he have a habit of running very low tank levels and just adding 2-3 gallons occasionally? Quote Link to comment Share on other sites More sharing options...
idosubaru Posted December 27, 2016 Share Posted December 27, 2016 Test voltage at pump connector. I concur with anything but OEM or highly touted pumps. Quote Link to comment Share on other sites More sharing options...
dp213 Posted December 27, 2016 Author Share Posted December 27, 2016 He only runs premium gas and no additives. He's good about keeping it filled and not running it low. We put a new one in yesterday at his place and he's going to come out this week so we can test things, line voltage, fuel pressure before and after regulator We did use a walbro before, this time we went with what is supposed to be OEM but I'm not sure. It is kayoto or something. We will see what happens. Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted December 28, 2016 Share Posted December 28, 2016 cleaning and refreshing ground connections might be worthwhile - especially if there seems to be some rust/corrosion on the car. Quote Link to comment Share on other sites More sharing options...
idosubaru Posted December 28, 2016 Share Posted December 28, 2016 "Supposed to be OEM" based on research, parts store commentary, or a label on the box? OE and OES are tricky marketing ploys to sound like OEM? Quote Link to comment Share on other sites More sharing options...
naru Posted December 28, 2016 Share Posted December 28, 2016 I have put 2 fuel pumps in my son's 02 WRX in the last year and it's dead again. The last one I put in was a walbro 255 lph pump. Is there something that could be causing these failures. Thanks Dp Dirt and grit in the tank. Or plugged filters. Did you wash out the tank? Change the filter sock? The filter? Every fuel pump warranty I have ever seen requires all 3. Quote Link to comment Share on other sites More sharing options...
subarusubarusubaru Posted December 31, 2016 Share Posted December 31, 2016 order your parts online through your local dealership. get instore pick up so you dont have to pay for shipping. a lot of the time the dealer part will be maybe 2 dollars more than the oem. but at least you know its the exact fit for your car. maybe swap out the fuse. check and see if too much voltage is being supplied to the fuel pump. is there a short? Quote Link to comment Share on other sites More sharing options...
dp213 Posted January 2, 2017 Author Share Posted January 2, 2017 Well, it quit working again. I did some trouble shooting and found 12 volts at the fuse but only 5.9 volts to the pump I plugged it back in and it worked fine again. I don't know what to think now. Is the harness going to the pump replaceable? Quote Link to comment Share on other sites More sharing options...
naru Posted January 2, 2017 Share Posted January 2, 2017 Check voltage on both sides of the relay. Not uncommon for the contacts to be bad. Quote Link to comment Share on other sites More sharing options...
dp213 Posted January 3, 2017 Author Share Posted January 3, 2017 Where is the relay located for the fuel pump Quote Link to comment Share on other sites More sharing options...
naru Posted January 3, 2017 Share Posted January 3, 2017 I think it is located in the passenger side kick panel w/a green connector. You should note that some WRXs have a fuel pump controller between the relay and pump. Its function is to control the fuel pump w/a variable duty cycle. Not sure how that would affect your voltage readings. diagram here http://www.perth-wrx.com/vb/mechanicals/37207-fuel-pump-not-priming-no-start-2.html Quote Link to comment Share on other sites More sharing options...
naru Posted January 3, 2017 Share Posted January 3, 2017 https://forums.nasioc.com/forums/showthread.php?t=607913 Post #8 suggests 6-9 volts at idle is normal. Quote Link to comment Share on other sites More sharing options...
dp213 Posted January 4, 2017 Author Share Posted January 4, 2017 5.9 volts WA when I turned key on no start Quote Link to comment Share on other sites More sharing options...
naru Posted January 4, 2017 Share Posted January 4, 2017 What is WA? The controllers go bad sometimes. You may find this interesting.http://www.underhoodservice.com/subaru-pulse-width-modulated-fuel-pumps/ Quote Link to comment Share on other sites More sharing options...
dp213 Posted January 5, 2017 Author Share Posted January 5, 2017 My bad. WA not even supposed to be in there. Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted January 5, 2017 Share Posted January 5, 2017 Interesting read naru. Thanks for posting that. Quote Link to comment Share on other sites More sharing options...
Cougar Posted January 6, 2017 Share Posted January 6, 2017 There should be 12 volts getting to the pump when the key is first turned on but it only lasts a couple of seconds if the engine isn't running. The relay is the next thing to verify after the fuse. Then the power wire to the pump. The black/yel wire from the relay (after the relay contacts) turns to blk/red on the pump side so the connection may be between between the those two points if the relay is okay. Quote Link to comment Share on other sites More sharing options...
naru Posted January 6, 2017 Share Posted January 6, 2017 Pretty sure an 02 WRX uses the pump controller. If there is 12v on both sides of the relay contacts,I`d be checking the ground for the pump controller next. Put your voltmeter between the ground lead (black) and battery negative and measure the voltage w/cranking. Anything other than near 0 indicates trouble. Having a look at the controller duty cycle would be very helpful if possible, Easiest w/a scanner. Should be 100% for a short time w/starting 33% at idle.Higher w/more throttle Quote Link to comment Share on other sites More sharing options...
Cougar Posted January 7, 2017 Share Posted January 7, 2017 Thanks for the heads-up on the controller Naru, the turbo model engine does have one. From the details given by the OP it seems there is a bad wire connection somewhere in the power circuit for the pump. Quote Link to comment Share on other sites More sharing options...
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