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Old 01-06-2009, 03:08 PM   #1
squashman
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Default Modified 2008+ STI owners - fuel pump question... same assembly as LGT?

This question is for the guys who have had to upgrade their fuel pumps on their '08+ STI's due to whatever... big Stage 2 setup, turbo upgrade, etc.

Is the 2008+ STI fuel pump assembly the same as a LGT fuel pump assembly? Subaru, for whatever reason, changed the fuel pump setup for GR series STI's so that they're now similar to the LGT setups.

I'm trying to find out if they're the same assembly (even if they're different fuel pumps) since instead of hacking away at the pump housing with a dremel to make the Walbro fit, I'll just get one of the pre-assembled Walbro 255 LGT pump assemblies.

Any help would be great.

Thanks.
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Old 01-06-2009, 04:22 PM   #2
atc5
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avo sells their pump in assembly as an option. Also many vendors sell walbro in lgt pump assembly as well. Good luck
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Old 01-06-2009, 04:24 PM   #3
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there was a post not long ago that stated that the 08 STi fuel pump was quite a bit higher volume than any previous ones

IIRC it was 170lph but that may be wrong
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Old 01-06-2009, 06:33 PM   #4
squashman
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Wirelessly posted (BlackBerry9000/4.6.0.185 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/107)

I read on LGT.com that the '08+ STI had a 175lph fuel pump and the LGT's were 155lph. That's second hand info though, so it may not be accurate.

What I'm really asking is if the pump assembly, ie. the pump housing, is interchangeable between both models. As atc5 said, vendors sell the Walbro pump already fitted inside a modified housing. That makes my job 20 minutes versus the time cutting and shaping my housing to work with the Walbro.
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Old 01-07-2009, 09:42 AM   #5
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For people who search this in the future...
So I've gotten it from two sources that the '08+ WRX and STI fuel pump assemblies are the exact same as the LGT assemblies, and they are in fact interchangeable. The only difference is the STI pump flows 20lph more than the LGT pump.

To fit a Walbro 255 or Avo 245, modifications (cutting and grinding) to the inner housing have to happen to make it fit and seal properly. I purchased a pre-modified housing + Walbro from PLTEK.com and will post up some shots comparing both assemblies side by side.
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Old 01-07-2009, 09:55 AM   #6
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awesome!

Quote:
Originally Posted by squashman View Post
For people who search this in the future...
So I've gotten it from two sources that the '08+ WRX and STI fuel pump assemblies are the exact same as the LGT assemblies, and they are in fact interchangeable. The only difference is the STI pump flows 20lph more than the LGT pump.

To fit a Walbro 255 or Avo 245, modifications (cutting and grinding) to the inner housing have to happen to make it fit and seal properly. I purchased a pre-modified housing + Walbro from PLTEK.com and will post up some shots comparing both assemblies side by side.
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Old 01-07-2009, 10:39 AM   #7
x3vin
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so did the wrx get the 155 or 175?
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Old 02-05-2009, 09:26 AM   #8
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To fit a Walbro 255 or Avo 245, modifications (cutting and grinding) to the inner housing have to happen to make it fit and seal properly. I purchased a pre-modified housing + Walbro from PLTEK.com and will post up some shots comparing both assemblies side by side.
Are you selling the 08 sti fuel pump?
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Old 02-05-2009, 09:51 AM   #9
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I was, sort of, but I just returned my OEM pump on the core exchange program with PLTEK.net instead.

Here's my write-up on the install -
I upgraded my standard 175lph fuel pump to a Walbro 255lph fuel pump to accomodate my big turbo build. I have to say I cheated pretty badly on this one. I bought a pre-modified pump housing with a Walbro already installed in it. Otherwise, because of the changes to the '08+ Impreza's fuel pumps compared to earlier MY's, there's a lot more involved. For one, the assembly has to be 'cracked' open, you need to dremel away at the inside of it to fit the Walbro, then you have to be relatively innovative to get the parts back together. So, for me, a couple extra bucks for the pre-modified assembly was the ticket.

Step 1: Pop off the gas tank cap to relieve some pressure. You should only have 1/4 of a tank of less when doing this install. You don't want more... you'll see why once you pull the pump out.


Step 2 (optional): Pull the fuel pump fuse, start the car, and allow it to run until it dies on it's own from lack of fuel pressure. This way, you know there's no pressure left in the lines = less mess when pulling the fuel lines.

Step 3: Remove the rear seat. It's easy enough since the seat is held in by three clips. Pull from the front of the seat up and back at each corner and finally in the middle. The seat will pop right out.
- see the three metal clips


- see the female connection for seat clips (bottom of pic)


Step 4: Disconnect the fuel pump wiring harness.


Step 5: Unscrew the 4 x Phillips screws holding the fuel pump concealing plate. Put the plate off to the side for the time being.



Step 6: Unplus harness on top of fuel pump.


Step 7: Remove fuel lines. Make sure to have paper towels, rags, shop towels... whatever to catch the gas because you will spill some during this step. To remove the lines, simply squeeze the plastic line clip together and slide the hose off.


Step 8: Remove 8 x 8mm nuts.

Step 9: Remove OEM fuel pump by pulling off securing plate first, then pulling out the entire pump assembly. Be sure to have a clean bucket with you in your back seat to catch the pump since there is still going to be fuel inside of it. Also, be very careful of the float arm getting bent. I suggest tilting the pump towards the driver side of the car, then pulling up and out.


Step 10: Remove large O-ring and remember the orientation of it. There are three little rubber tabs that stick up that much be aligned correctly with the securing plate.
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Old 02-05-2009, 09:51 AM   #10
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Comparison:
OEM LGT fuel pump assembly w/ Walbro installed (left) versus OEM '08 STI fuel pump and assembly (right). Can you spot the difference?


Step 10: Transfer O-ring to new pump. As in #10, note the proper orientation of the O-ring.

Step 11: Transfer line clips to new pump. To remove the clips from the old pump, simply take a flat head screwdriver and pop the clips off. Don't do it with only your hands since you'll likely break them. A flat-head allows you to get behind the clip and pop it up naturally without having to bend them.


Step 12: Install new pump. Do not install the concealing plate yet.

Step 13: Once the pump, lines and connectors are reinstalled and the pump is secured with the securing plate, you can now fire up the engine. Prime the fuel pump first by turning the ignition to "on" without starting it. Once the pump re-pressurizes the lines, start the car.

Step 14: Look for leaks. If all is well, install the concealing plate, reinstall the back seat and you're good to go.
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Old 03-02-2011, 12:59 PM   #11
sumfoo1
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Who sells the entire 255 unit?

I'd like to convince one to throw in the DW 300lph.

Either that or order a cheap one from a junk yard lol.

As far as the sending unit is concerned is it the same as non turbo models?
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Old 04-11-2011, 07:30 PM   #12
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I just bought an aeromotive in take pump which is rated for meth/ethanol use 345lph, it took 2 months to get it, back ordered all over the country. Same dimensions as a walbro
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Old 04-11-2011, 07:38 PM   #13
Vlad
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I just wanted to mention that I have used the 08 sti OEM pump in my 2002 WRX and according to my tuner, it had safe headroom at the time that I was making 270 WHP.

So people that are removing their OEM 2008+ Sti fuel pumps, you can sell them to 2.0 WRX guys.
It's almost a drop in, I have a thread back in 2009 about this.
It's a better alternative to a walbro at that power level, because it's OEM quiet and OEM reliable.

Remember that when you take your fuel pump off, you have to store it with fuel in it, to prevent inside gaskets from degrading. Put a bit of fuel in it and cap both pump inlet and outlet.
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Old 02-07-2013, 07:45 PM   #14
subiefan19
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can i use a 2008 fuel pump in a 2002 wrx?
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Old 02-07-2013, 07:51 PM   #15
subiefan19
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did you just throw it right in because im trying to use my mom 2008 wrx fuel pump in my 2002 wrx
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Old 02-08-2013, 06:52 AM   #16
Vlad
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2008 Sti. 2008 WRX has a lower flow rating. It could be similar to a GDB Sti 2002-2007.
Still more than the 2002 WRX.
Yes, you can install it into the WRX. But you have to take the pump out of the plastic can in which it sits in a 2008.
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