Did I screw up already? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Low84 · 06-09-2012, 10:40 AM

So I'm planning out the fuel system for my 78 c10, and I'm thinking I may have already screwed up.

I have an '04 lq4 with the electric throttle body, which i want to swap out for a cable driven one. So I picked up a 99-02 ecm and ordered a harness for that computer... Didn't the 99-02 have a return style fuel system and the 03+ have a returnless style? Am I going to have to swap out fuel rails too?!
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BR3W CITY · 06-09-2012, 11:43 AM

Mine's an 03 from a van and had DBW and return rails...but there are people who will tell you that they never came that way....which mine did.

Low84 · 06-09-2012, 12:20 PM

Mines gonna end up the opposite. Throttle cable with returnless, if that's possible...
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ls1nova71 · 06-09-2012, 02:16 PM

It will work, but the tune is different between returnless and return fuel rails. It's probably splitting hairs though... you most likely would never know the difference. But if you have someone who is good with tuning it can be changed in the tune. F-bodys were all DBC with returnless rail.
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gringoloco · 06-09-2012, 11:47 PM

Any info on what exactly needs to be changed in the tune? I've seen this referred to a few times, but never any specifics
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Low84 · 06-10-2012, 07:43 PM

Quote:

Originally Posted by ls1nova71

It will work, but the tune is different between returnless and return fuel rails. It's probably splitting hairs though... you most likely would never know the difference. But if you have someone who is good with tuning it can be changed in the tune. F-bodys were all DBC with returnless rail.
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That's good news! Thank you.

So, I've been trying to piece this thing together. Would anybody look through it and let me know if you see any issues?

I have a few questions, I'm going to use steel braided hose:

-I'm having a hard time figuring out how to plumb the filter. The item description doesn't tell me what's on the in side as far as size or fitting
-And how do you attach the hose end fittings to the actual hose?

chevydog66 · 06-10-2012, 10:05 PM

I used the Summit powdercoated aluminum tank, and aluminum hard line for my fuel line feed and return. You can flare the aluminum tube easily to use a fuel filter with AN fittings.

BR3W CITY · 06-10-2012, 10:08 PM

Quote:

Originally Posted by Low84

That's good news! Thank you.

So, I've been trying to piece this thing together. Would anybody look through it and let me know if you see any issues?

I have a few questions, I'm going to use steel braided hose:

-I'm having a hard time figuring out how to plumb the filter. The item description doesn't tell me what's on the in side as far as size or fitting
-And how do you attach the hose end fittings to the actual hose?

Isn't the fuel pump supposed to come before the 'vette regulator?

chevydog66 · 06-10-2012, 10:12 PM

Not sure about that. Mine is a 01 DBC 6.0. I ran a return, but I didn't use the vette filter regulator.

kwin · 06-10-2012, 10:20 PM

Quote:

Originally Posted by BR3W CITY

Isn't the fuel pump supposed to come before the 'vette regulator?

Thats my understanding, the filter returns excess pressure to the tank. So the pump would have to come before the regulator/filter.

Kim57 · 06-10-2012, 10:44 PM

This is the pump I bought for my conversion because my tank has a -8 fitting. I changed the exit fitting to a -6 to make it easier to plumb into the filter/regulator.
http://www.ebay.com/itm/Walbro-GSL39...sories&vxp=mtr
This is the filter/regulator I'm using.
http://www.ebay.com/itm/Wix-33737-Fu...906747&vxp=mtr
Here's some pics of my set up.
I have a pre-filter then the pump then the vette filter.
Hope this helps.
Kim

Low84 · 06-11-2012, 02:09 PM

Thank you everyone for helping clear this up.

Kim, thanks A LOT! You even saved me some money

Last question: Are your running -6 AN hose throughout?

Kim57 · 06-11-2012, 04:10 PM

Quote:

Originally Posted by Low84

Thank you everyone for helping clear this up.

Kim, thanks A LOT! You even saved me some money

Last question: Are your running -6 AN hose throughout?

I ran -8 from the tank through the pre-filter and the inlet on the pump.
Then I ran 3/8 hard line. I changed the outlet fitting on the pump to a -6 to accommodate my hard line. I used a sleeve and nut and did my own 37 degree flares. I've seen the fittings for the pump at Pep Boys in their section where they have the Russell fittings.
Kim

68GMCCustom · 06-11-2012, 05:51 PM

mine looks like Kims...but I used 3/8" - 6 AN s.s. hose for everything.

06-09-2012, 10:40 AM	#1
Low84 Registered User Join Date: Oct 2004 Location: Roma,TX Posts: 774	Did I screw up already? So I'm planning out the fuel system for my 78 c10, and I'm thinking I may have already screwed up. I have an '04 lq4 with the electric throttle body, which i want to swap out for a cable driven one. So I picked up a 99-02 ecm and ordered a harness for that computer... Didn't the 99-02 have a return style fuel system and the 03+ have a returnless style? Am I going to have to swap out fuel rails too?! Posted via Mobile Device

06-09-2012, 11:43 AM	#2
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Did I screw up already? Mine's an 03 from a van and had DBW and return rails...but there are people who will tell you that they never came that way....which mine did. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

06-09-2012, 12:20 PM	#3
Low84 Registered User Join Date: Oct 2004 Location: Roma,TX Posts: 774	Re: Did I screw up already? Mines gonna end up the opposite. Throttle cable with returnless, if that's possible... Posted via Mobile Device

06-09-2012, 02:16 PM	#4
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: Did I screw up already? It will work, but the tune is different between returnless and return fuel rails. It's probably splitting hairs though... you most likely would never know the difference. But if you have someone who is good with tuning it can be changed in the tune. F-bodys were all DBC with returnless rail. Posted via Mobile Device __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

06-09-2012, 11:47 PM	#5
gringoloco A guy with a truck Join Date: Sep 2005 Location: Germany, for now Posts: 5,921	Re: Did I screw up already? Any info on what exactly needs to be changed in the tune? I've seen this referred to a few times, but never any specifics Posted via Mobile Device __________________ -Chris Instagram _elgringoloco_ '70 Short-Wide How to: Ruin a perfectly good C10 ‘70 Blazer ConversionHow To: Ruin a Perfectly Good 4wd '72 Highlander How To: Ruin a Perfectly Good K/5 (SOLD) '72 Blazer 2WD How to: Ruin a perfectly good Blazer (SOLD) '05 Yukon Daily Driven (not so stock) Yukon (SOLD) ‘07 Yukon Denali (daily) Members met list: SCOTI, darkhorse970, 67cheby, 67cheby'sGirl, klmore, porterbuilt, n2billet, Fastrucken, classicchev, Col Clank, GSFMECH, HuggerCST, Spray-Bomb, BACKYARD88, 5150, fine69, fatbass, smbrouss70, 65StreetCruiser, GAc10boy

06-10-2012, 10:05 PM	#7
chevydog66 GM ONLY BABY!!! Join Date: Oct 2003 Location: Fort Wayne, IN. Posts: 1,998	Re: Did I screw up already? I used the Summit powdercoated aluminum tank, and aluminum hard line for my fuel line feed and return. You can flare the aluminum tube easily to use a fuel filter with AN fittings. __________________ 2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up

06-10-2012, 10:12 PM	#9
chevydog66 GM ONLY BABY!!! Join Date: Oct 2003 Location: Fort Wayne, IN. Posts: 1,998	Re: Did I screw up already? Not sure about that. Mine is a 01 DBC 6.0. I ran a return, but I didn't use the vette filter regulator. __________________ 2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up

06-10-2012, 10:44 PM	#11
Kim57 Registered User Join Date: Aug 2007 Location: Corona, California Posts: 7,998	Re: Did I screw up already? This is the pump I bought for my conversion because my tank has a -8 fitting. I changed the exit fitting to a -6 to make it easier to plumb into the filter/regulator. http://www.ebay.com/itm/Walbro-GSL39...sories&vxp=mtr This is the filter/regulator I'm using. http://www.ebay.com/itm/Wix-33737-Fu...906747&vxp=mtr Here's some pics of my set up. I have a pre-filter then the pump then the vette filter. Hope this helps. Kim Attached Images __________________ My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=283107

06-11-2012, 02:09 PM	#12
Low84 Registered User Join Date: Oct 2004 Location: Roma,TX Posts: 774	Re: Did I screw up already? Thank you everyone for helping clear this up. Kim, thanks A LOT! You even saved me some money Last question: Are your running -6 AN hose throughout?

06-11-2012, 05:51 PM	#14
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: Did I screw up already? mine looks like Kims...but I used 3/8" - 6 AN s.s. hose for everything. __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken



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