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Old 05-02-2012, 11:52 AM   #1
sixtoo
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Default 2.5L Fuel Filter Replacement

In searching for some advice on changing the "in-tank" fuel filter on an 05+ Subaru, I decided to start a thread since the majority of ones that pop up in a search involve changing a filter that resides in the engine bay.

So, for those interested in DIY directions, have a look at a thread from the good folks at Scoobymods. The swap seems to be straight-forward, however I have a couple of questions from those who may have done this maintenance job already.

Here are some of the tech docs also found on the Scoobymods site:

PDF #1


PDF #2


PDF #3



At last, here are the questions:

PDF#1 Step 5: Drain fuel from tank
Is it necessary to do this step? If I plan things out properly, I can have the tank near empty when I do the swap. However, I imagine that the possibility for fuel vapors to emanate increases when you have less gas in the tank. Any thoughts?

PDF#2 INSTALLATION - Gaskets
Does anyone have part numbers? Have you reused your gaskets? I am wondering if there is a big gasket that goes around the fuel pump assembly. If there is, I am curious how important it is to replace it. Given that my car is 5 years old, I imagine that it will not be deteriorated that much. But it would be nice to get suggestions on how to tell if it needs a replacement.

I guess that's about it. I have read about some of the other tips like turning the key, but not starting the car, repeatedly to avoid CELs and misfire codes. Any other advice would be greatly appreciated. Thanks!!
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Last edited by sixtoo; 05-02-2012 at 11:58 AM.
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Old 05-02-2012, 12:43 PM   #2
HinshawWRX
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I wouldn't say that draining the tank is necessary in the fact maintenance can still be done to it while it's full, but since the fuel pump and filter are submerged it makes it easier, less messy, and less chance of fire.
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Old 05-03-2012, 10:17 AM   #3
sixtoo
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Thanks for the feedback!



Can anyone weigh in on questions about the gasket?
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Old 05-03-2012, 04:57 PM   #4
ronin322
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I had to replace the fuel pump on 1998 Outback. I did was lucky and did not have to take the tank down to replace it. There is a plate in very back deck in front of the spare tire well. That gives you access to the fuel tank plate that you have to remove to get the fuel pump. The whole process took about half hour. There were some wires that were tightly stretched over the plate that had to be moved to get the fuel pump out. The rubber gasket looked good, but I replaced it anyway. Make sure you do in it a well ventilated area. I had about 279000 miles on it before the fuel pump died.
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Old 07-22-2012, 10:01 PM   #5
DragginFrame
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I know this is a couple months late but I just did mine last week so I figured I'd weigh in.

I didn't drain my fuel tank, I just waited until I was under 1/4 tank.

My car has just under 100K on it, so I replaced the gasket that seals the fuel pump assembly to the tank (part number 42060AA040) at the same time I did the fuel filter (part number 42072FE020). My old filter was brown and nasty looking, definitely in need of replacement. I have owned the car since 44K and only run 93 octane name-brand gas (usually Sunoco or Shell). I couldn't believe how much smoother my car runs now, mostly when pulling out or shifting gears. I won't wait another 100K to do this job again...
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Old 07-22-2012, 11:06 PM   #6
Uncle Scotty
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i think imma do mine here when I do the 100k service
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Old 07-30-2012, 10:18 AM   #7
Gorge
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Is the fuel filter the sock? I picked up a Walbro 255 FP with the installation kit. Is the filter the same as the white sock? If I install the FP, should I reuse the stock sock or the walbro white sock? I have 60k on my 07 WRX.
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Old 07-30-2012, 04:57 PM   #8
DragginFrame
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Negative, the fuel filter is not the sock. You'll want to reuse your stock sock (the walbro one is much smaller and is supposedly more prone to collapsing). The fuel filter is a dealer only piece and will run you in the neighborhood of $70--just make sure you also replace the gasket that seals the fuel pump assembly to the gas tank.
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Old 07-31-2012, 11:09 AM   #9
Gorge
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Quote:
Originally Posted by DragginFrame View Post
Negative, the fuel filter is not the sock. You'll want to reuse your stock sock (the walbro one is much smaller and is supposedly more prone to collapsing). The fuel filter is a dealer only piece and will run you in the neighborhood of $70--just make sure you also replace the gasket that seals the fuel pump assembly to the gas tank.
Thank you.

I noticed a lot of the STi guys saying to use the stock sock and a few of the WRX guys saying that they used the Walbro sock without any issues. I wonder if there is a difference between the WRX and the STi.

I will order the fuel filter and the gasket too. I guess I'll be waiting another week to install my FP.
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