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Whos running a Walbro 400LPH FP?

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Old Feb 14, 2012, 08:20 PM
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Originally Posted by Full-Race Geoff
im running the walbro 400lph pump in my evo 8, using stock wiring, stock fuel rail, stock FPR and stock lines. No problems so far but ive only driven 14 miles total doing shakedowns

edit: going to tune tomorrow on pump gas (crappy az 91 octane) and see what it does, ill post up in this thread after
AWESOME! thanks for posting hope you get some good results!

Originally Posted by Kidloco51
Im running a Walbro 400. Stock wiring/FPR etc. Making 450/400 @26 psi with FIC 1450's (e-85) Sold my DW 300 because I was running out of fuel above 27-28 psi
nice, are you on stock block/turbo? how is your evo at idle with the 400?

Originally Posted by drb
Use the Walbro 400. The fuel pump hanger modifications are a 30 minute job, or you can send your hanger to Buschur or MAP & they will install the 400 for approx. $100 in labor.

I ran out of fuel with the Walbro 255 on E-85 and 1450cc FIC Bluemax Injectors. 525HP/424TQ on VD (Dynojet Setting).

I installed a Walbro 400 and an adjustable FPR, probably didn't need the FPR. The tune richened up significantly, but I have not been re-tuned for the 400 yet. I'm going to have Tom tune it on the standard wiring, no rewire.

I'm guessing that an adjustable FPR isn't necessary on the stock wiring, but you will probably need one if you do a rewire.
please post your results here

i definitely plan on getting this fuel pump. im really considering doing my own install...but im kinda waiting on a side by side comparison picture of a stock/walbro 255 setup vs the walbro 400 housing...if anyone can provide the pics of the housings side by side that would be a great help to this thread!

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Old Feb 15, 2012, 01:28 PM
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So..., is the Walbro 400lph capable to flow enough to make +600whp on the stock pressure regulator, stock lines, and without a re-wire kit?
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Old Feb 15, 2012, 05:09 PM
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looks like it!..im doing e-85 in a month and im looking into this pump..hopefully i dont have to get a double pumper and this will work great
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Old Feb 15, 2012, 05:29 PM
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from what im reading, this pump should be capable of 600whp on e85. not sure about the re-wire though...i think when i am gonna install it ill just keep it on stock wiring.

but im lost as to whether we REALLY need to run an adjustable FPR with this fuel pump.
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Old Feb 15, 2012, 06:40 PM
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Originally Posted by Full-Race Geoff
im running the walbro 400lph pump in my evo 8, using stock wiring, stock fuel rail, stock FPR and stock lines. No problems so far but ive only driven 14 miles total doing shakedowns

edit: going to tune tomorrow on pump gas (crappy az 91 octane) and see what it does, ill post up in this thread after
would you mind showing us a picture on what needs to be modified for the pump to fit?
Last edited by fqjdmct9a; Feb 16, 2012 at 05:26 AM.
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Old Feb 15, 2012, 09:06 PM
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i have a rewired walbro 400 on stock lines/fpr and runs fine.
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Old Feb 16, 2012, 07:48 PM
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Taken from their respective watermarked owners.


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Old Feb 16, 2012, 09:02 PM
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so looks like I just have to eliminate the bottom bracket.
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Old Feb 16, 2012, 09:09 PM
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You can keep the bottom bracket intact. It requires cutting quite a bit off with a dermal tool though.

I am running the Walbro 400 on stock wiring and no FPR. Car idles/runs great. My tuner adjusted my fuel maps after the 400 was installed.
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Old Feb 16, 2012, 09:28 PM
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Ugh, why couldn't you guys have just bumped the original thread :P

FWIW I've been running one for about a month on my X, stock wiring, stock rail, stock FPR, 1680's, and a BAP, making about 630whp dynojet with ease...
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Old Feb 17, 2012, 12:15 PM
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Dumb Question Coming: Can someone tell me what does BAP stand for and what is its purpose?
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Old Feb 17, 2012, 01:20 PM
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Boost-A-Pump

It allows you to increase voltage delivered to the pump up to 18v-22v depending on the model.
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Old Feb 17, 2012, 01:30 PM
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Originally Posted by pure_evo
Dumb Question Coming: Can someone tell me what does BAP stand for and what is its purpose?
its ok...i didnt know what it was either...
and even though someone just told us, i still dont get it. hahaha...
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Old Feb 17, 2012, 01:55 PM
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Fuel pumps flow more when they are supplied with more voltage (they also draw more amperage as voltage increases so make sure your wiring is up to snuff).

Our DW300 pump flows 320LPH @ 40psi and 13.5v vs. 385LPH @ 40psi and 16v
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Old Feb 19, 2012, 02:03 PM
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Originally Posted by DeatschWerks
Fuel pumps flow more when they are supplied with more voltage (they also draw more amperage as voltage increases so make sure your wiring is up to snuff).

Our DW300 pump flows 320LPH @ 40psi and 13.5v vs. 385LPH @ 40psi and 16v
Ya, I have the 40-amp model (BAP) and it runs at 17.5V, probably pushing your DW300 pump to right around 400LPH. It definitely works, made a solid 550whp dynojet with it like that for almost a year!
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