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Old 03-14-2004, 07:09 PM   #1
thedude
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Default Please help: Factory fuel pump short

Hey guys,

I started a post in the Service and Maintenence Forum, but I decided to update this thread in the General Forum for more exposure.


I have a 2003 WRX with a little over 6k miles on the odo. It has a Cobb Tuning Stage 2 reflash with an APS turbo back. Yesterday, my wife and I and her friend were headed out for the day and my car dies in the driveway and won't restart. Cranks fine, but will not start. After checking the connectors on the ECU and adding an extra gallon of fuel, I attempted to restart and still NOTHING!!

Next, I checked the fuses starting with the fuse box under the hood. Immediately after opening the lid, I see a 30A PAL fuse that has blown. The owners manual has no description for this particular fuse but I had to assume it was for the fuel pump given the symptoms. The fuse is pink in color and is near the main 80A fusible link.

After making a trip to Autozone to get a fuse, I replace the fuse and restart the car. I let it run for about a half hour and everything seems fine.

The next day we pile into the car again to try and head out. As soon as my wife's friend gets in the back seat and sits down (passenger side) the car shuts off AGAIN. Now I begin to wonder if the fuel pump wiring is under where she is sitting and has shorted out. After removing the seat, I see that there is a wire bundle that looks like it is for the fuel pump. I cannot see any visible short but I am almost certain this is where the problem lies.

Now even though my car is modified, the fuel pump has never been touched. The back seat had never been removed until today. My wife's friend also is a tooth pick, so it's not like I put some 300 lb fat chick in the back.


If anyone here has any information about the factory fuel pump fuse, or the fuel pump wiring please help me out. I would also like to know if anyone else has experienced anything like this before. I am not 100% sure of my hypothesis, but I seems to be the only logical explanation. I initially thought it might have something to do with the reflash. But I can't see the correlation any longer.


Thanks in advance,
Joe
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Old 03-15-2004, 03:28 AM   #2
Uncle Scotty
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If you have a mod friendly dealer near you, then take it there...if not, you are gonna have to figure out what you want to do with it....take it back to stock and take it to a dealer maybe...

This is NOT a common problem....I can't remember seeing a post on it before.
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Old 03-15-2004, 08:20 AM   #3
thedude
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Today I drove to work with noone in the back seat and everything is fine. When I get home, I'm gonna start this car up in my driveway and hop in the passenger side back seat to see if it the fuse blows again. Yesterday, I pulled the back seat up and move the wire pack so it wouldn't be pinched so much by the foam under the seat. I am now pretty certain this is where the problems lies. Even though I have modified this car a bit, this is clearly a factory defect.


I did find one more post similar to mine where a WRX cut off and wouldn't restart. Evidently, the guy who owned it took it to the dealership and they blamed it on a loose ECU connector that was killing his fuel pump. This happened after the guy installed a reflashed ECU. I am now starting to wonder if this guy really had a short under his back seat too



Joe
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Old 03-16-2004, 02:04 AM   #4
Charlie-III
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I think you have the culprit identified.
It may be inside the tape wrap on the wires.
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Old 06-24-2005, 01:11 AM   #5
nate.the.great
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The same thing happened to me! Although, I had no one in the backseat. I think my wire may have been pinched around my ECU area. I had an aftermarket alarm put in and my large ecu wire was not hooked into the proper spot, and I was sitting in the passenger side with my feet on the ecu cover.
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Old 06-24-2005, 06:21 AM   #6
Mulder
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Are you the first owner or did someone have the car before you? It does sound like the fuel pump and wiring have been disturbed at some point, you shouldn't see an exposed wire bundle under there.
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Old 06-24-2005, 10:14 AM   #7
nate.the.great
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I am the first owner. I think I wasn't clear. The large ecu bundle "mounts" into a spot in order to keep it in place. It was out of place. Maybe that affected the cooling of the ecu and my ecu overheated? I have no idea.
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Old 06-24-2005, 12:51 PM   #8
Uncle Scotty
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...or rubbed a wire bare and it is shorting...
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Old 06-24-2005, 01:45 PM   #9
nate.the.great
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yeah, i'm going to go over what i can this weekend. thanks.
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Old 06-24-2005, 02:27 PM   #10
Mulder
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My reply was for the original poster, but I ignored my own advice and failed to check the post date which is almost a year ago. So I'd presume this has been long since resolved.
As for you nate, I agree with Scotty that you should look for damaged or pinched wires where they were moved or disturbed.
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