How To: Dual Fuel Lines - evolutionm.net
evolutionm.net - Home of the Lancer Evolution
Home Features Community Marketplace Registry Garage Store

Go Back   evolutionm.net > Lancer Evolution 1-9 Forums > Evo How Tos / Installations > Evo How To Requests / Questions / Tips
Sign in using an external account
Register Forgot Password?
Search


Evo How To Requests / Questions / Tips If you're looking for a how-to on something, ask in here.

Reply
 
 
 
 
Thread Tools Search this Thread
Old Oct 6, 2009, 12:03 AM   #1
Evolved Member
Personal Sales Rating: (34)
Garage is empty, add now
 
rodent's Avatar
 
Join Date: Apr 2006
Location: Highlands Ranch, CO
Posts: 656

Drives: 2005 WW Evo VIII

How To: Dual Fuel Lines

When my car was running out of fuel, one look at my stock fuel line, and I knew it was the cause and way too small to support 700whp. You have many options getting the fuel from the pumps to the rail. One idea I liked was using the stock vent line. The vent line is the same diameter as the stock fuel line and ran all the way down the bottom of the car. I wasn’t using this tube so it made sense to utilize it. So basically, all Evo's have two -6AN (5/16) lines running down from their tank to the firewall. Since I already have a Double Pumper setup, I was going to run each pump into its own line all the way to the firewall. From there it would go into a wye and then a larger -8AN would be ran to the fuel rail. This will give more than enough pipe for the fuel to flow. Keep in mind I’m running E85 which requires more fuel to the injectors.

Return Line:
I tried to keep the return line stock but soon realized I had problems with the 2nd pump not kicking on when it was suppose to. This turned out to be a defective hobbs switch. When it did come on, it would spike the fuel pressure causing a rich condition and making it difficult to tune that area. I believe the new twin line setup was causing some of this. Too much fuel coming in and no way for the regulator to return it fast enough. I decided to keep it simple and have both pumps on all the time using a relay to drive the 2nd pump. The problem with that is too much fuel pressure at idle. Some have gotten around this by drilling out the siphon tube. This didn’t appeal to me since the stock return line was still only 1/4” and I wanted something that was closer to -6AN (5/16) size. Unfortunately you can’t run a larger return line since it has to run through the smaller siphon tube. The siphon tube is what sucks the gas from the other tank so its a crucial piece of the fuel system. My solution was to add another 1/4” line and tee it off. This way I could run the larger -6AN into two 1/4" lines back to the tank. The siphon tube will also work and the regulator will be able to return the fuel at idle.

First step on the dual fuel feed, was to cut the vent line close to where the metal fuel line starts. A small body saw or dremel works great. Be careful not to cut the other lines since they are close. You can then bend the line down a little to gain access. Compressed air is blown backwards through the vent line to avoid metal shavings in the line.
Click the image to open in full size.

New lines and filters installed from the pumps. Zip ties were used to keep the filters in place.
Click the image to open in full size.

Click the image to open in full size.

Here is where the vent line ends up. Right next to the stock fuel lines under the brake master.
Click the image to open in full size.

Here's the new wye. It has two -6AN fittings at the bottom, and -8AN at the top. It also comes with a threaded hole for the fuel pressure sender which is added. Bracket is made out of alum. that will hold it in place to one of the bolts on the brake master.
Click the image to open in full size.

Here it is installed with both lines attached at the bottom. I tried to route the fuel lines around the brake lines using a 45 degree and straight fittings at the bottom. The wye and some fittings were left overs from another project so its not show quality here but it works.
Click the image to open in full size.

Other shots farther away-
Click the image to open in full size.
I also made a custom regulator mount that uses the factory bolts.
Click the image to open in full size.

The new -8AN fitting at the fuel rail and the -8 hose connecting it.
Click the image to open in full size.

Here's the top of the fuel pump assembly. Hard to see everything but the square brass fitting at the top is the 2nd return line. The 1st return line is underneath the larger hose on the left.
Click the image to open in full size.

Hopefully this helps someone wanting to do a custom dual feed fuel setup. There's other ways you can do this but this is how I did mine. Let me know if you have questions.

Last edited by rodent; Oct 6, 2009 at 12:07 AM.
Offline
 
Reply With Quote
Old Oct 9, 2009, 05:20 PM   #2
Evolving Member
Personal Sales Rating: (4)
2003 Mitsubishi Lancer Evolution
 
EvoVIII808's Avatar
 
Join Date: Jan 2007
Location: Washington
Posts: 480

Drives: Laser Blue Evo 8

awwsniper
Send a message via AIM to EvoVIII808 Send a message via Yahoo to EvoVIII808
man that is nice. ive been thinking about doing the same thing. Did you build the double pumper yourself, or got the buschur dp? im thinking about building it all myself, but havnt figured out how i want to get it done. but will most likely look like the buschur style.
__________________
UnDeR CoNsTrUcTiOn!! JMF, RNR, HKS, AMS, SuperTech, Brian Crower, ETS, Wiseco, MAP, Aquamist, ACT, GNS Custom Double Pumper
Flickr EvoVIII808 Blog EvoClub Hawaii
Offline
 
Reply With Quote
Old Oct 10, 2009, 03:36 PM   #3
Evolved Member
Personal Sales Rating: (34)
Garage is empty, add now
 
rodent's Avatar
 
Join Date: Apr 2006
Location: Highlands Ranch, CO
Posts: 656

Drives: 2005 WW Evo VIII

Thanks. My twin pump is a Buschur DP.
Offline
 
Reply With Quote
Old Oct 13, 2009, 02:07 AM   #4
Evolving Member
Personal Sales Rating: (4)
2003 Mitsubishi Lancer Evolution
 
EvoVIII808's Avatar
 
Join Date: Jan 2007
Location: Washington
Posts: 480

Drives: Laser Blue Evo 8

awwsniper
Send a message via AIM to EvoVIII808 Send a message via Yahoo to EvoVIII808
sweet, that looks like what i will be going with them.
__________________
UnDeR CoNsTrUcTiOn!! JMF, RNR, HKS, AMS, SuperTech, Brian Crower, ETS, Wiseco, MAP, Aquamist, ACT, GNS Custom Double Pumper
Flickr EvoVIII808 Blog EvoClub Hawaii
Offline
 
Reply With Quote
Old Oct 23, 2009, 10:05 AM   #5
Evolved Member
Personal Sales Rating: (34)
Garage is empty, add now
 
rodent's Avatar
 
Join Date: Apr 2006
Location: Highlands Ranch, CO
Posts: 656

Drives: 2005 WW Evo VIII

Update-
So far, everything is working great with the dual feed and return lines. The only thing I had to change was the AEM fuel pressure sensor. At the wye, it was fluctuating too much when I was driving down the road. I moved it to the FPR and the fluctuating is gone. The external FP gauge is now on the wye which shows correct at idle.
Offline
 
Reply With Quote
Old Nov 10, 2010, 08:56 AM   #6
Evolved Member
Personal Sales Rating: (9)
Garage is empty, add now
 
itzwolf's Avatar
 
Join Date: Mar 2005
Location: Florida
Posts: 1,167

Drives: 2003 Evo VIII & 2011 Evo X

Bumping for sightly more detail maybe a picture or two on how the dual return was done and if you have had any issues with fuel being pulled from the passenger side.

I'd think from a restriction point the fuel would follow the return with the siphon setup...?
Offline
 
Reply With Quote
Old Nov 10, 2010, 03:31 PM   #7
Evolved Member
Personal Sales Rating: (34)
Garage is empty, add now
 
rodent's Avatar
 
Join Date: Apr 2006
Location: Highlands Ranch, CO
Posts: 656

Drives: 2005 WW Evo VIII

Dual return is easy. From the regulator with -6AN line, I “T” it off. The T (or wye) has a larger fitting for the -6 line and two smaller fittings for the 2 return lines. One goes to the stock return, the other line is added and zip tied along the stock fuel lines. I think I used ” line. The additional line ends at the fuel pump assembly where it dumps there with another ” fitting on top. It does not dump on the passenger side. I’ll try to get some pictures showing this.

Fuel flows in both return lines and the stock siphon is untouched (not drilled). It will siphon just fine and I’ve been through several tanks with no issues. I know Ted and others have had good luck with the drill method and just use the stock return line only which is only around ” size. I wanted something a little larger and let the regulator do its job with no restriction in the return.
__________________
Evo VIII - 2.4LR, JE pistons, MAP UD Rods, L-19, CNC ported head, +1mm valves, Kiggley springs, S3 cams, Full Race header/DP, 6766 turbo, Tial 38mm WG, AEM CG, 3.5" exhaust with Varex, Custom LICP & UICP, ETS 4" FMIC, Tial Q 50mm, Magnus v5 mani, Boomba TB, Aeromotive rail & FPR, FIC 2150cc, Surge tank with dual A1000 pumps, Sparktech COP w/M&W Ignition, CBRD Rad, AEM S1, D2 coilovers, Kosei wheels, CF trunk, IX Conversion, Custom HID heads, JDM rear, D-DIN w/ Orbital, AEM Gauges, Jake Tuned
Offline
 
Reply With Quote
Old Jan 15, 2011, 03:14 PM   #8
Newbie
Personal Sales Rating: (0)
2003 Mitsubishi Lancer Evolution
 
EVIL-EVO-8's Avatar
 
Join Date: Apr 2009
Location: South Florida
Posts: 55

Drives: 2003 Evolution 8

Nice thats exactly what im doing next!
__________________
2003 EVO 8 - Bushur 2.0 shortblock, Stg. 3 head, GSC 272's, HTA 86R turbo kit, AMS intercooler, tial BOV, Custom intercooler pipes welded by Myself, AEM EMS, BR COP ignition, BR double pumper to 1200cc injectors, Exedy tripple plate clutch, Tial BOV, and all the supporting goodies. BUILT BY ME. 520whp on 93 octane!
Offline
 
Reply With Quote
Old Jan 15, 2011, 03:19 PM   #9
Newbie
Personal Sales Rating: (0)
2003 Mitsubishi Lancer Evolution
 
EVIL-EVO-8's Avatar
 
Join Date: Apr 2009
Location: South Florida
Posts: 55

Drives: 2003 Evolution 8

Also Someone at a Evo shop Told me to not use the inline fuel filters because they can fail and starve the motor for fuel... True or False?
__________________
2003 EVO 8 - Bushur 2.0 shortblock, Stg. 3 head, GSC 272's, HTA 86R turbo kit, AMS intercooler, tial BOV, Custom intercooler pipes welded by Myself, AEM EMS, BR COP ignition, BR double pumper to 1200cc injectors, Exedy tripple plate clutch, Tial BOV, and all the supporting goodies. BUILT BY ME. 520whp on 93 octane!
Offline
 
Reply With Quote
Old Jan 16, 2011, 11:35 AM   #10
Evolved Member
Personal Sales Rating: (34)
Garage is empty, add now
 
rodent's Avatar
 
Join Date: Apr 2006
Location: Highlands Ranch, CO
Posts: 656

Drives: 2005 WW Evo VIII

Quote:
Originally Posted by EVIL-EVO-8 View Post
Also Someone at a Evo shop Told me to not use the inline fuel filters because they can fail and starve the motor for fuel... True or False?
News to me. I've had no issues with mine and Buschur has been selling in line fuel filters with all his double pumpers and dual fuel line kits for years and I haven't read of any problems. Which Evo shop told you this?

I may ditch the cheaper filters though and run a single Aeromotive filter between the wye and fuel rail.
Click the image to open in full size.
__________________
Evo VIII - 2.4LR, JE pistons, MAP UD Rods, L-19, CNC ported head, +1mm valves, Kiggley springs, S3 cams, Full Race header/DP, 6766 turbo, Tial 38mm WG, AEM CG, 3.5" exhaust with Varex, Custom LICP & UICP, ETS 4" FMIC, Tial Q 50mm, Magnus v5 mani, Boomba TB, Aeromotive rail & FPR, FIC 2150cc, Surge tank with dual A1000 pumps, Sparktech COP w/M&W Ignition, CBRD Rad, AEM S1, D2 coilovers, Kosei wheels, CF trunk, IX Conversion, Custom HID heads, JDM rear, D-DIN w/ Orbital, AEM Gauges, Jake Tuned
Offline
 
Reply With Quote
Old Jul 17, 2013, 11:32 PM   #11
Evolving Member
Personal Sales Rating: (2)
Garage is empty, add now
 
shangai's Avatar
 
Join Date: Sep 2007
Location: PUERTO RICO
Posts: 195

Drives: EVO 8

Got some doubts. How can i pass the fuel lines fom top of the tank to the floor? Theres no space do i need to cut both metal line and get rid of them to make some space to pass it down?
Offline
 
Reply With Quote
Old Jul 17, 2013, 11:32 PM
EvolutionM
Mitsubishi Lancer




Paid Advertisement
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
F/S brand new double pumper evodan2004 For Sale/WTB - Engine / Drivetrain / Power 86 Sep 29, 2014 02:41 PM
Fuel return line fitting @ hanger jrainwater Evo Engine / Turbo / Drivetrain 21 Aug 15, 2014 05:48 AM
Squash Performance Double Pumper 240Z TwinTurbo Vendor Service, Parts & Tuning Review 8 May 4, 2013 01:49 PM
AMS Red Fuel Rails On Sale!! Chris@nolimitmotors EvoX 'For Sale' External Engine / Power 5 Mar 14, 2013 02:28 PM
Innovate WB install in IX gauge cluster kaj Evo How Tos / Installations 4 Jan 12, 2013 07:58 PM


Tags
dual, duel, eclipse, evo, feed, fuel, gmc, line, lines, pump, rc, setup, siphon, size, tank, typhoon

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


 









All times are GMT -7. The time now is 04:11 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
All Passwords