05-12-2008
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#1
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Pewp Champion
Join Date: Nov 2003
Location: Blaine
Drives: Teh Bean
Posts: 12,309
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Dual Walbro's in a 1G AWD
For anyone wanting to install dual Walbro's in-tank, in parallel, into a 1G AWD, here is a quick rundown of how my install went.
Performed on a 91 TSi AWD using dual Walbro 255HP pumps.
- Pump is located in the rear hatch on the drivers side. Begin by removing the electrical plug, and the 2 screws holding the black cover down.
- Next, using a 14mm flare wrench (important because using a standard open end wrench may cause you to strip the fitting), disconnect the fuel feed line.
- With the fuel line disconnected, using an 8mm socket, remove the 6 nuts holding the fuel sending unit down.
- Remove the fuel sending unit
- I had a second fuel sending unit as my original one had a broken power terminal. Cut approximately where the red lines are. This simply allowed the pumps to sit a little nicer against the sending unit. And cutting the output tube will allow you to attach a normal fuel line to it.
- Attach a Y (I just used a barbed T from Ace), and attach high pressure fuel line with clamps. Clamp the fuel pumps to the fuel sending unit using a worm clamp. You can use 2 if you don't feel that 1 is enough. Land both the ground wires at the grounding point on the fuel sending unit. Land both the positive wires to the power stud on the bottom of the top plate.
- Reinstall the fuel pump assembly. It is all simply the reverse of the removal.
That is all. Thanks to various others who helped me with this. If there is anything you think I should have done different please let me know. Hopefully this will be useful to someday else at some point in time.
Last edited by Halon; 05-13-2008 at 10:00 AM..
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05-13-2008
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#2
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Banned
Join Date: Mar 2006
Location: Minnesota
Drives: down the middle of the fairway bitches!
Posts: 1,306
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Re: Dual Walbro's in a 1G AWD
Nice write up, did you reuse your strainer?
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05-13-2008
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#3
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formerly ecoli
Join Date: Oct 2003
Location: On the dyno
Posts: 4,892
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Re: Dual Walbro's in a 1G AWD
Did you use submersible fuel line? The normal high pressure EFI fuel line and SS braided lines doesn't like fuel on the outside of it and eventually fails. The line that comes with Walbro kits is submersible or you can get 1 foot sections from Napa.
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05-13-2008
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#4
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formerly ecoli
Join Date: Oct 2003
Location: On the dyno
Posts: 4,892
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Re: Dual Walbro's in a 1G AWD
Do you have any upgraded wiring/relays/fuses powering both those pumps?
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05-13-2008
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#5
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Pewp Champion
Join Date: Nov 2003
Location: Blaine
Drives: Teh Bean
Posts: 12,309
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Re: Dual Walbro's in a 1G AWD
Quote:
Originally Posted by ecoli
Do you have any upgraded wiring/relays/fuses powering both those pumps?
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No wiring changes. Is this something I need to be concerned about?
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05-13-2008
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#6
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flips McGee
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Re: Dual Walbro's in a 1G AWD
Good info brandon!
In this situation where both pumps are always on, is an aftermarket FPR necessary?
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05-13-2008
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#7
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Join Date: Oct 2003
Location: edward lake
Drives: toaster
Posts: 6,431
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Re: Dual Walbro's in a 1G AWD
very nice the same way craig and steve has it done. I would do a pump rewire on them also
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05-13-2008
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#8
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Pewp Champion
Join Date: Nov 2003
Location: Blaine
Drives: Teh Bean
Posts: 12,309
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Re: Dual Walbro's in a 1G AWD
I prefer to keep this as simple as possible which is the main reason I didn't rewire it. I shouldn't need a rewire for more voltage, because with 2 pumps it should be able to supply plenty of fuel even at 12V. But if I need a rewire because of Amperage, then I will definitely consider it. Any input is welcome and appreciated. I couldn't find a How To on this really, so I just went off what I could find and I never found any thing anywhere mentioning issues with amperage, but I'm open to hear anything anyone has to say.
Last edited by Halon; 05-13-2008 at 01:17 PM..
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05-13-2008
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#9
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Pewp Champion
Join Date: Nov 2003
Location: Blaine
Drives: Teh Bean
Posts: 12,309
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Re: Dual Walbro's in a 1G AWD
Quote:
Originally Posted by scheides
Good info brandon!
In this situation where both pumps are always on, is an aftermarket FPR necessary?
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I would say yes. With 2 you'd more then likely outflow the stock FPR. And on a 1G AWD, the rest of the stock fuel return system after the AFPR should easily be able to handle the 2 pumps. No need to upgrade that.
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05-13-2008
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#10
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Join Date: Mar 2006
Location: Minnesota
Drives: Cars
Posts: 1,457
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Re: Dual Walbro's in a 1G AWD
i was always curious how this was done, good write up.
__________________
-Matt
'94 Eagle Talon TSI AWD
'06 Acura TL
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05-13-2008
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#11
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Finally Tuned...
Join Date: Apr 2006
Location: Zimmerman
Drives: Spyder GSX
Posts: 2,484
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Re: Dual Walbro's in a 1G AWD
Good information. Is doing a 2g awd similar? Anyone have a link for a 2g setup?
__________________
94 Supra TT Auto, Project 9.xx in the works
97 Spyder AWD 6 bolt 2.3, 579hp 496tq **FOR SALE**
Amsoil Dealer
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05-13-2008
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#12
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Pewp Champion
Join Date: Nov 2003
Location: Blaine
Drives: Teh Bean
Posts: 12,309
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Re: Dual Walbro's in a 1G AWD
I started researching into if there is an amerage issue with running dual pumps off the stock wiring. I believe the MPI fuse is a 20A fuse. On RRE's site they show at 73 psi, the pump is drawing 10.5 amps. Double that for 2 pumps. Now I'm wondering, does that MPI fuse directly feed the fuel pump? If so then at full boost I have a good chance of popping that fuse. But if that fuse is just for the MPI relay, and the fuel pump feed is actually coming through different leads on that relay or something, meaning that 20A fuse isn't in the direct path of the fuel pumps, then I shouldn't have a concern with that 20A fuse.
Anyone who knows a lot more about this then me care to chime in?
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05-13-2008
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#13
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Join Date: Oct 2004
Location: Maple Grove
Posts: 956
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Re: Dual Walbro's in a 1G AWD
I have seen several people do this with stock wires, no problems or blown fuese to report as of yet.
My galant and my buddies talon will outrun the single 255's we have in there pretty soon.
When we switch over to the 2x pump system, if i have any problems ill post up here.
__________________
building a 3000GT AWD Turbo.
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05-13-2008
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#14
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Pewp Champion
Join Date: Nov 2003
Location: Blaine
Drives: Teh Bean
Posts: 12,309
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Re: Dual Walbro's in a 1G AWD
You've seen several people run the dual Walbro's on the stock wiring? What kind of fuel pressure are they at at full boost?
The thing I'm worried about is in fact blowing that fuse. If I get my fuel pressure up to around 70psi and the amp draw is too much, that's really not a good time for my fuel pumps to lose power.
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05-13-2008
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#15
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Re: Dual Walbro's in a 1G AWD
The problem with the stock wiring is that it doesnt supply enough voltage when you upgrade pumps. So upgrading to two pumps would help but you are drawing even more power on the stock wiring. I think thats a bad idea.
I would upgrade to thicker wiring, add a relay and a larger fuse.
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05-13-2008
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#16
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aka Goodbye
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Re: Dual Walbro's in a 1G AWD
If you remember a long time ago, people were seeing a noticeable difference in fuel flow just rewiring any single fuel pump, and that's when using a 190lph pump was an upgrade and the 255lph was considered a race car mod. Mine's been upgraded since 1997, so putting in two pumps, I didn't really need to upgrade. I definitely would if you're on stock wiring. I might even upgrade mine directly to the battery instead of the FP relay.
__________________
2009 Corvette Z51-SOLD
1992 Mitsubishi Eclipse GSX-SOLD
2013 BMW Z4-Current summer hooptie
2017 GMC Yukon-Current winter hooptie
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05-13-2008
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#17
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Pewp Champion
Join Date: Nov 2003
Location: Blaine
Drives: Teh Bean
Posts: 12,309
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Re: Dual Walbro's in a 1G AWD
Yes I understand by rewiring, you may see an extra 2 volts or so at the fuel pump, allowing it to flow more. I did this on my old 2G 7 years back. It's a great mod if you are pushing the pump. But do you think I'm going to need those extra 2V in this case? Am I going to require more then what 2 255hp's put out at 12V? I honestly don't think so. Guys have ran SC61's pushing a single 255 to it's limits. 2 255's won't flow double, but will flow quite a bit more then a single. As of right now I really don't think I need to rewire this because I need that extra 2V for more flow. But again, what about amperage? Adding a 2nd pump just doubled the amperage the stock wiring will be seeing. That's what I'm worried about, too much amperage on the stock wires. I may just end up rewiring it because I don't want to pop a fuse and lose power to the pumps during a 30psi pull. That'd make for a real bad day
Last edited by Halon; 05-13-2008 at 03:52 PM..
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05-13-2008
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#18
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Join Date: Nov 2005
Location: Cottage Grove
Drives: Silver '02 IS300, Blue '06 Suzuki SV1000
Posts: 5,293
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Re: Dual Walbro's in a 1G AWD
I'd say just rewire it and be safe. There's no sense in worrying about too much amperage when you alredy know how to prevent it.
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'02 Lexus IS300
'06 Suzuki SV1000: Back on the road and ripping hard as ever!
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05-13-2008
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#19
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Banned
Join Date: Mar 2006
Location: Minnesota
Drives: down the middle of the fairway bitches!
Posts: 1,306
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Re: Dual Walbro's in a 1G AWD
Damnit kevin, you need to fix that quote in your signature...
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05-20-2008
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#20
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Smells Like Fish
Join Date: Nov 2004
Location: Maple Grove
Drives: 96GSX
Posts: 215
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Re: Dual Walbro's in a 1G AWD
Is there an easy way of identifying a 190 vs a 255? I don't know which one i have. I can only assume running a 190 with a 255 is not on the safe side, right?
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out-running the velocichoppa! in my dsm.
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