Walbro's new 400LPH pump: X-specific discussion
The entire line. You can buy fittings (from Jegs, etc) that are a direct fit to the factory high pressure nipples on the fuel pump housing. I can help you with the fittings if you want. At the speed you work, you'd probably have it plumbed up in an hour if you had all the pieces in front of you.
ya, a w400 at full line voltage (12-14v) would def require an afpr.
EvoM Guru
iTrader: (50)
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From: Tri-Cities, WA // Portland, OR
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Assuming that the nipples on the Evo 10 housing are the same size as used on the Evo 8/9 housing, then the key piece is Aeromotive PN 15118. This converts from the quick connect nipple on the pump housing to -8 AN flare threads. The -8 AN side it not actually a flare fitting though. The way to connect to it is to use a -8 AN male to male connector and put an o-ring on the end that connects to 15118. From there, the rest of the arrangement can be AN fittings and hose all the way to the rail.
Assuming that the nipples on the Evo 10 housing are the same size as used on the Evo 8/9 housing, then the key piece is Aeromotive PN 15118. This converts from the quick connect nipple on the pump housing to -8 AN flare threads. The -8 AN side it not actually a flare fitting though. The way to connect to it is to use a -8 AN male to male connector and put an o-ring on the end that connects to 15118. From there, the rest of the arrangement can be AN fittings and hose all the way to the rail.
http://www.summitracing.com/parts/RUS-644003/
After a bit of discussion with scheides, I found a more simple adapter solution made by Russell:
http://www.summitracing.com/parts/RUS-644003/
http://www.summitracing.com/parts/RUS-644003/
So, back to the walbro 400. I had it drilled to 2.0mm with a 5/64" bit. AFRs touching 11.8-12.0 after swapping in the EF4 for the BBX.
Friday I had some spare time and decided to drill it to 2.4mm but when I saw the 7/64" bit I just went for it. That puts the siphon at about a hair shy of 2.8mm.
Ran the tank down below 1/4, parked on a hill for a while, restarted fine, so siphon seems to be working just dandy. Logs show that WOT AFRs are a healthy .3 AFR richer, which is good...on the EF4 I'm going to need every last ounce out of this thing. VirtualDyno still showing ~635whp dynojet @31psi.
Base pressure doesn't seem to have changed, still 45-ish. I'm still on the stock FPR so I think an AFPR will be in order if I want to attempt to get it lower. I'm happy for now, but a fuel rail and then -6AN feed line and then maybe AFPR are definitely on the horizon.
Friday I had some spare time and decided to drill it to 2.4mm but when I saw the 7/64" bit I just went for it. That puts the siphon at about a hair shy of 2.8mm.
Ran the tank down below 1/4, parked on a hill for a while, restarted fine, so siphon seems to be working just dandy. Logs show that WOT AFRs are a healthy .3 AFR richer, which is good...on the EF4 I'm going to need every last ounce out of this thing. VirtualDyno still showing ~635whp dynojet @31psi.
Base pressure doesn't seem to have changed, still 45-ish. I'm still on the stock FPR so I think an AFPR will be in order if I want to attempt to get it lower. I'm happy for now, but a fuel rail and then -6AN feed line and then maybe AFPR are definitely on the horizon.
EvoM Guru
iTrader: (50)
Joined: Mar 2006
Posts: 9,675
Likes: 132
From: Tri-Cities, WA // Portland, OR
So, back to the walbro 400. I had it drilled to 2.0mm with a 5/64" bit. AFRs touching 11.8-12.0 after swapping in the EF4 for the BBX.
Friday I had some spare time and decided to drill it to 2.4mm but when I saw the 7/64" bit I just went for it. That puts the siphon at about a hair shy of 2.8mm.
Ran the tank down below 1/4, parked on a hill for a while, restarted fine, so siphon seems to be working just dandy. Logs show that WOT AFRs are a healthy .3 AFR richer, which is good...on the EF4 I'm going to need every last ounce out of this thing. VirtualDyno still showing ~635whp dynojet @31psi.
Base pressure doesn't seem to have changed, still 45-ish. I'm still on the stock FPR so I think an AFPR will be in order if I want to attempt to get it lower. I'm happy for now, but a fuel rail and then -6AN feed line and then maybe AFPR are definitely on the horizon.
Friday I had some spare time and decided to drill it to 2.4mm but when I saw the 7/64" bit I just went for it. That puts the siphon at about a hair shy of 2.8mm.
Ran the tank down below 1/4, parked on a hill for a while, restarted fine, so siphon seems to be working just dandy. Logs show that WOT AFRs are a healthy .3 AFR richer, which is good...on the EF4 I'm going to need every last ounce out of this thing. VirtualDyno still showing ~635whp dynojet @31psi.
Base pressure doesn't seem to have changed, still 45-ish. I'm still on the stock FPR so I think an AFPR will be in order if I want to attempt to get it lower. I'm happy for now, but a fuel rail and then -6AN feed line and then maybe AFPR are definitely on the horizon.
Evolving Member
Joined: Feb 2009
Posts: 340
Likes: 2
From: Australia
^ in the tube that goes to the top of the bit you drilled out, or just after it. sprry it's been a while...
you'll need to take the (?black?) tube off the top of the return assy (split it with a knife) to get to it, and use a small clamp to put it back on.
you'll need to take the (?black?) tube off the top of the return assy (split it with a knife) to get to it, and use a small clamp to put it back on.
ahh. yah I was hesitant to cut that line.
I had cut mine when I installed the pump in the first place, pulled it off for easier access, but yea I had to carefully cut mine too. Just do it cleanly, with a razor, then trim a bit and reinstall with a hose clamp, easy peasy.
