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Walbro Fuel Pump Kit 255lph (Part Number: )
Walbro Fuel Pump Kit 255lph (Part Number: )
Walbro Fuel Pump Kit 255lph (Part Number: )
Walbro Fuel Pump Kit 255lph (Part Number: )
Walbro Fuel Pump Kit 255lph (Part Number: )
Walbro Fuel Pump Kit 255lph (Part Number: )
Walbro Fuel Pump Kit 255lph (Part Number: )
Walbro Fuel Pump Kit 255lph (Part Number: )
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Walbro Fuel Pump Kit 255lph (Part Number: )
Walbro Fuel Pump Kit 255lph
Subaru WRX/STi 2002-2007
Read 21 Reviews | 28 Q&As
Part # GSS342 400-791
msrp: $205.44

In stock! Ships same day


Walbro Fuel Pump 255Lph Instock  QTY (1)
Walbro Installation Kit Instock  QTY (1)

Features & Product Details

The Walbro GSS342 fuel pump is one of the most popular aftermarket fuel pumps on the market today. Flowing 255 Liters Per Hour it can flow enough fuel for most applications under 500 hp. This kit comes with the installation kit for the vehicle shown in the confirmed applications.


Brand: Walbro
Adjustable: No
Fuel Flow: 255lph
Install Kit Included: Yes
Mfgr. Warranty: No Warranty
Condition: New Product
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.



21 Reviews
4.5 out of 5 Stars
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Customer Photos and Videos
Walbro Fuel Pump Kit 255lph ( Part Number: GSS342 400-791)
Walbro 255 4 months ago
I had to change the fuel filter on my '04 STi and I figured I might as well upgrade my fuel pump while I'm in there... This kit comes with everything I needed. Direct fit. Easy to do.
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Awesome  8 months ago
Just got this because my old pump was failing and was causing a lean condition. It's like everyone says it's loud but you know its working. My cars stock and this is Definitely worth the upgrade, doesn't bog or hesitate at full boost. it takes around an hour to do yourself. Just be careful with the level arm putting it back in. Your gonna need the upgrade eventually just get it
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Works well, tight fit.  9 months ago
Works great. Was a tight fit into the 2002 WRX fuel pump assembly, but I didn't have to shave or bend anything, just mindful when putting it together. No issues at all, though.
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Works great, tight fit 9 months ago
Installation is pretty straight forward. Only issue was that the pump itself would not fit with the rubber grommet used to hold it in place. I left that out and used a zip tie instead. Don’t notice any louder noises on start up. Great product as always.
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Good Kit 2 years ago
I've used this kit on previous Subaru projects, and when starting a new project I always like to start with the pump. very easy install, and it's reliable. The filter that it comes with doesn't fit the slosh box in the STi configuration, so be prepared to order an OEM sock.
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  • Q: Fule pump   Mv125124 months ago

    Can I run e85 with this fule pump
    • 0 of 0 people found the following answer helpful

      A:  This fuel pump is E85 compatible, although you may want to go for a higher LPH pump, depending on your power goals.

      Marcus E. @ RallySport Direct 4 months ago  
      Was this answer helpful?
  • Q: Fitment  Jadesubi38 months ago

    I have an 07 sti and bought just the walbro pump, can it be straight drop in? Or do I need to buy the kit and hardware ?
    • 0 of 0 people found the following answer helpful

      A:  It may require some minor modification or adjustments, but the pump can be installed in your 07 STI.

      Marcus E. @ RallySport Direct 7 months ago  
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  • Q: oem  11green119 months ago

    I am curious if there would be a problem running a higher lpm pump on the stock wrx system? I'm looking at a replacement but want something that will support future upgrades. Regards J.
    • 1 of 1 people found the following answer helpful

      A:  No problem at all! Throw this on and keep on driving!

      Tyler G.
      Was this answer helpful?
  • Q: Walbro 255 pump  mario82510 months ago

    Will this pump support the injector dynamics 1050cc injectors?
  • Q: 255 fuel pump wiring harness  xlagman922 years ago

    I'm installing this pump into my 03 wrx and was wondering do I use the old harness on the stock pump or the new harness in the kit?