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Old 01-19-2018, 01:49 AM   #1
Vancouver98STi
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Question Replacement fuel pump

The fuel pump has failed in my '98 JDM Impreza STi, so after reading a lot of threads in a lot of forums, there seems to be a difference of opinion in regards to which Walbro would be the correct replacement... the GSS341 or the GSS342. The bone of contention is the location of the inlet in relation to the outlet. Several people have posted that the incorrect pump will result in the inlet being on the "wrong" side in respect to how the filter sock sits in the tank. This image below shows the difference between the two pumps.




So I pulled my pump today, looks original... and the outlet is smack dab in the middle on the top of the pump.






I see no difference which of the two Walbro pumps could be used. With either one, the outlet at the top is going to be offset by a half inch or so (no big deal)... and the inlet/pump bottom can only go into the mounting bracket one way, so the filter sock will be sitting correctly in the tank no matter what.

And the same 400-791 wiring/installation kit is used with both replacement pumps.

So, I don't get it... what is all the confusion about in regards to which replacement fuel pump to get for an older JDM WRX/STi... the GSS341 or the GSS342? They both appear to be able to fit. Am I missing something?

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Last edited by Vancouver98STi; 01-19-2018 at 02:02 AM.
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Old 01-19-2018, 10:01 PM   #2
2slofouru
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Why not a DW300, or even a DW200? The DW are quieter pumps overall.

Your original pump looks like the huge one that came in my 95 usdm 1.8L. If your original is indeed the large diameter type, it won't matter which of the two you choose, since their diameters are decreased. You would likely be picking the one that has inlet and outlet on same side, with the connector side closer to the bracket though. The 341 seems to be the orientation that is chosen on the other forums. I'd recommend the Deatschwerks in the same orientation over a walbro. The DW200 is also a 255lph pump.

Just remembered I have a DW200 I ran in my 2.5i for around a week then put the oem back.

Last edited by 2slofouru; 01-19-2018 at 10:18 PM.
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Old 01-20-2018, 08:26 AM   #3
Jaxx
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my solution was to orient the pump correctly then put a hose clamp around it to secure it
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Old 01-20-2018, 09:16 PM   #4
Vancouver98STi
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Quote:
Originally Posted by 2slofouru View Post

Why not a DW300, or even a DW200? The DW are quieter pumps overall.

I'd recommend the Deatschwerks in the same orientation over a walbro.
Yes, I've read criticisms of the Walbro pumps. Not only are they somewhat noisier, but I've also read some complaints of their relative short life span of a year or two.

Deatschwerks fuel pumps appear to have a good reputation, but I've also been reading up on pumps from HRC. It's possible they're not as well known on this side of the Atlantic, but reviews are quite favorable and prices are very competitive.

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Originally Posted by Jaxx View Post

my solution was to orient the pump correctly then put a hose clamp around it to secure it.
The factory fuel pump is just held in place by the bracket at the bottom and the connection to the fuel line at the top. Various people have reported that just bending the metal fuel line a tiny bit (to help compensate for the replacement pump's offset fuel outlet) works fine. This supposedly is enough to keep all components lined up correctly and secure, but I guess I won't know for sure until I try it myself.

Thanks for the feedback guys.
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Old 01-21-2018, 05:26 PM   #5
thoughto
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I like HRC. I had one that died after about 5-6 years (maybe more) soon after I almost ran the tank dry. It had a good innings. That was a 320lph model that I got tuned on. I actually had a Walbro that was nearly new at the time but the tuner (in England) told me he didn't trust Walbro as there were some fake ones around then.
Anyway, when I had a problem HRC gave me some worthwhile feedback and suggested I get a 290lph replacement as it would probably be more reliable and more than sufficient for me with only 339 crank BHP (I was set to buy a 340lph one). It was a very good price and I bought it direct so I know it wasn't a copy. Car is back to working well again (especially for 20 years old and doing 400 miles a week most of the time the last 6 months).
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Old 01-21-2018, 06:23 PM   #6
Vancouver98STi
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It had a good innings.
Heh heh... that expression certainly gives you away as a Brit.

Quote:
Originally Posted by thoughto View Post

HRC gave me some worthwhile feedback and suggested I get a 290lph replacement... It was a very good price and I bought it direct... Car is back to working well again... especially for 20 years old...
It appears your STi is the same vintage/version as mine.



Was there any confusion at all in regards to the required installation kit (wiring connector, filter sock, etc) that comes with the HRC pump? Simply plug and play?
.

Last edited by Vancouver98STi; 01-22-2018 at 01:04 AM.
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Old 02-13-2018, 09:59 AM   #7
thoughto
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Sorry I didn't reply sooner, saw your reply but was busy.
What I had already done was to cut the connectors and do some crimping to connect to my Walbro pump. When I switched to the HRC I think it was plug and play. But the way the original Version 4 pump is connected you have to cut wires to connect an aftermarket pump.
When I put in the second HRC pump I realised the crimping I had done wasn't that great. This time I twisted the wires together, soldered them (just a little bit), and used a heat gun and shrink wrap over the top. In my opinion it's well worth doing that.

Your car looks nice. Mine's white with gold wheels too, but it's a sedan.
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Old 02-13-2018, 05:36 PM   #8
Vancouver98STi
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Quote:
Originally Posted by thoughto View Post

When I switched to the HRC I think it was plug and play. But the way the original Version 4 pump is connected you have to cut wires to connect an aftermarket pump.
So, I'm a little unclear what you're stating here. You mention the HRC pump is "plug and play"... but you also mention the need to "cut wires to connect an aftermarket pump". I'm confused.

Does the HRC pump meant for our cars not come with a connection/harness that will simply plug into the factory fitting indicated below?




I ordered the HRC pump from the UK, and it arrived in just a week at my US shipping address just south of where I live on the west coast of Canada... which I thought was pretty quick. I haven't picked it up yet, which is why I'm not 100% clear what type of wiring harness it's come with.

Quote:
Originally Posted by thoughto View Post

Your car looks nice. Mine's white with gold wheels too, but it's a sedan.
Thanks. I quite like this generation of Impreza STi. Considering these cars are now 20 years old, the styling IMO still stands up.
.

Last edited by Vancouver98STi; 02-13-2018 at 06:10 PM.
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Old 02-13-2018, 06:32 PM   #9
thoughto
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What I meant was, I had already had to cut the wires and make crimped connections to accomodate the Walbro pump I had installed before the first HRC. Neither the Walbro nor the HRC comes with a harness that plugs into the factory fitting at the position indicated. You have to cut the red and the black wire and join them to the wires coming out of the new pump. This is best done, in my opinion, by twisting the wires together, then soldering, then shrink wrapping the join (having slid the shrink wrap into position earlier). The first time I just made a joint by crimping, but it 'only' lasted about 8 years. BTW my original pump looked the same as yours when I switched it. I'm trying to remember, but not certain. I don't think you need the chip with the green wires coming from it with your new pump. Perhaps someone else can confirm? Good luck, pulling out and reinstalling fuel pumps is not much fun in my experience.
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Old 02-13-2018, 07:16 PM   #10
Vancouver98STi
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Neither the Walbro nor the HRC comes with a harness that plugs into the factory fitting at the position indicated.
In the blurb for the HRC pump, it states that it comes with a Fuel Tank Filter and a Wiring Harness Adapter. I asked HRC a couple of different times about this harness. I was a little disappointed that they couldn't/wouldn't respond to my messages inquiring about what model/year Subie this wiring harness was supposed to fit.

Quote:
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Good luck, pulling out and reinstalling fuel pumps is not much fun in my experience.
Actually, pulling the fuel pump on these cars is a breeze compared to a lot of other cars. Many of them require the gas tank to be dropped. My Subie wagon is so easy... just pop the hatch behind the folded down back seat, and remove the pump while sitting in the car. Piece of cake!
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Old 02-17-2018, 03:58 PM   #11
mrgf8sti
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I have the dw200, been going for 3 years. Had 1 problem not starting , but it was caused by a burnt ground pin on the connector on top of the fuel pump. I had to remove the black relay and wires because the dw300 came with its own harness, did you have to remove those for the HRC pump?

Last edited by mrgf8sti; 02-17-2018 at 04:07 PM.
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