My Twin Walbro 255 Fuel Pump Set up. Pictures and Info - ClubWRX Forum - Subaru Impreza WRX and STi Community and Forums

STEALTH-WRX · 09-29-2003, 01:53 PM

I was tossing around the idea of either one 310 fuel pump or 2 walbro 255 fuel pumps. With alot of talking and researching i decided to go with two fuel pumps. Its cheaper, flows more, and is something i wanted to see if i could do. I talked with a few supra tuners and they told me how to do it. Basically this is it. I drilled a hold for the fuel feed and welded a tube to a fitting. Then sandwiched the fitting with a special washer, a nut, and some chemical proof silicon. I ran the wires through another hole and used silicon on both sides to seal it. The power Wires are relayed and hardwired to the battery. Each fuel pump is fused with a 20 amp fuse. The relay trigger switch is run off ignition with a switch inline to kill the power if need be. This set up will be pushing an extremely large amount of fuel. I have switch the fuel return line with the fuel feed line. Now the fuel returns to the tank using the larger feed line. The fuel pressure will be increase alot due to the small return line, but i can fine tune it with the fuel pressure regulator. I am sure some of you will have doubts, but i just tested it and it works.

STEALTH-WRX · 09-29-2003, 01:54 PM

another

STEALTH-WRX · 09-29-2003, 01:56 PM

3 more

STEALTH-WRX · 09-29-2003, 01:56 PM

2 more

STEALTH-WRX · 09-29-2003, 01:57 PM

last one

Mili727 · 09-29-2003, 01:57 PM

Nice job, when are you getting tuned?

BoarderEight · 09-29-2003, 06:20 PM

WoW. You never cease to amaze me. Say bye bye to gas mileage!

STEALTH-WRX · 09-29-2003, 06:32 PM

I honestly dont think my gas milege will be that bad. I bet with low boost and a good tune i can pull 20+miles/Gallon. I am sure on high boost like 10miles/gallon

BoostedBoxer · 09-29-2003, 10:11 PM

that is a very nice setup. My hat is off to you for your skills. How much psi are you expecting?

CKxx · 09-30-2003, 10:03 AM

Shouldent the pressure be the same? Its just going to have a much higher volume...

Stealth, will both pumps be running full time? How is it wired? Im sure you already know to make its own curcuit so that if power is cut, they both die instead of underfulling on one pump.

Also, are you going to use some sort of fuel cooler? Are you worried about fuel temps rising since its going to be recirculated so much?

Sorry for so many questions, im just modding vicariously through your cool ass project.

STEALTH-WRX · 09-30-2003, 11:36 AM

I was thinking that the pressure would go up because the fuel would have a harder time to return since there is about 4 times as much as stock. As far as the fuel cooler: I have no idea.

CKxx · 09-30-2003, 07:15 PM

O ok, I never thought about the fact that the return would bottleneck it. Cool stuff.

MJU1983 · 09-30-2003, 07:28 PM

cool set up... this is the one that was used in the project car i posted about earlier...

For high horsepower EFI applications making up to:
1600 HP - Naturally Aspirated
1100 HP - forced air induction

-mike

STEALTH-WRX · 10-01-2003, 01:11 AM

I actually wanted to go with that one but for the money you cant go wrong. With all the lines, fittings and pumps I spent about $150 total. The aeromotive is $400. Plus the aeromotive only produces around 40lbs/hr more at 12v then my walbro's. I love the aeromotive pump though. I just need to budget my money.

09-29-2003, 01:53 PM	#1 (permalink)
STEALTH-WRX Registered User Join Date: Jan 2002 Location: California Posts: 507	My Twin Walbro 255 Fuel Pump Set up. Pictures and Info I was tossing around the idea of either one 310 fuel pump or 2 walbro 255 fuel pumps. With alot of talking and researching i decided to go with two fuel pumps. Its cheaper, flows more, and is something i wanted to see if i could do. I talked with a few supra tuners and they told me how to do it. Basically this is it. I drilled a hold for the fuel feed and welded a tube to a fitting. Then sandwiched the fitting with a special washer, a nut, and some chemical proof silicon. I ran the wires through another hole and used silicon on both sides to seal it. The power Wires are relayed and hardwired to the battery. Each fuel pump is fused with a 20 amp fuse. The relay trigger switch is run off ignition with a switch inline to kill the power if need be. This set up will be pushing an extremely large amount of fuel. I have switch the fuel return line with the fuel feed line. Now the fuel returns to the tank using the larger feed line. The fuel pressure will be increase alot due to the small return line, but i can fine tune it with the fuel pressure regulator. I am sure some of you will have doubts, but i just tested it and it works. Attached Images

09-29-2003, 01:54 PM	#2 (permalink)
STEALTH-WRX Registered User Join Date: Jan 2002 Location: California Posts: 507	another Attached Images

09-29-2003, 01:56 PM	#3 (permalink)
STEALTH-WRX Registered User Join Date: Jan 2002 Location: California Posts: 507	3 more Attached Images

09-29-2003, 01:56 PM	#4 (permalink)
STEALTH-WRX Registered User Join Date: Jan 2002 Location: California Posts: 507	2 more Attached Images

09-29-2003, 01:57 PM	#5 (permalink)
STEALTH-WRX Registered User Join Date: Jan 2002 Location: California Posts: 507	last one Attached Images

09-29-2003, 01:57 PM	#6 (permalink)
Mili727 Banned Join Date: Jun 2002 Location: Ga Posts: 3,145	Nice job, when are you getting tuned?

09-29-2003, 06:20 PM	#7 (permalink)
BoarderEight Registered User Join Date: Jan 2002 Location: NORCAL NATIVE Posts: 225	WoW. You never cease to amaze me. Say bye bye to gas mileage! __________________ BoarderEight

09-29-2003, 06:32 PM	#8 (permalink)
STEALTH-WRX Registered User Join Date: Jan 2002 Location: California Posts: 507	I honestly dont think my gas milege will be that bad. I bet with low boost and a good tune i can pull 20+miles/Gallon. I am sure on high boost like 10miles/gallon

09-30-2003, 10:03 AM	#10 (permalink)
CKxx Registered User Join Date: Feb 2003 Location: Pennsylvania Posts: 2,523	Shouldent the pressure be the same? Its just going to have a much higher volume... Stealth, will both pumps be running full time? How is it wired? Im sure you already know to make its own curcuit so that if power is cut, they both die instead of underfulling on one pump. Also, are you going to use some sort of fuel cooler? Are you worried about fuel temps rising since its going to be recirculated so much? Sorry for so many questions, im just modding vicariously through your cool ass project. __________________ I created my avatar.

09-30-2003, 11:36 AM	#11 (permalink)
STEALTH-WRX Registered User Join Date: Jan 2002 Location: California Posts: 507	I was thinking that the pressure would go up because the fuel would have a harder time to return since there is about 4 times as much as stock. As far as the fuel cooler: I have no idea.

09-30-2003, 07:15 PM	#12 (permalink)
CKxx Registered User Join Date: Feb 2003 Location: Pennsylvania Posts: 2,523	O ok, I never thought about the fact that the return would bottleneck it. Cool stuff. __________________ I created my avatar.

09-30-2003, 07:28 PM	#13 (permalink)
MJU1983 Registered User Join Date: Dec 2001 Location: Saint Louis, MO Posts: 2,618	cool set up... this is the one that was used in the project car i posted about earlier... For high horsepower EFI applications making up to: 1600 HP - Naturally Aspirated 1100 HP - forced air induction -mike

10-01-2003, 01:11 AM	#14 (permalink)
STEALTH-WRX Registered User Join Date: Jan 2002 Location: California Posts: 507	I actually wanted to go with that one but for the money you cant go wrong. With all the lines, fittings and pumps I spent about $150 total. The aeromotive is $400. Plus the aeromotive only produces around 40lbs/hr more at 12v then my walbro's. I love the aeromotive pump though. I just need to budget my money.

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