Duramax Diesels Forum Truck of the Week
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Old 02-22-2017, 06:56 AM
Blackmax123 Blackmax123 is offline
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Default Duramax fuel line replacement

I'm looking to replace all my restrictive factory hard fuel lines with 5/8 an line. I know I've seen a few treads on this before and I have some good screen shots I took. But up at the engine I want to put a junction block to run my feed lines into then out to the cp3's. Also want to run a junction block to tie all the returns into. The what is everyone using for this??

I've done some searching but can't seem to find the good tread. I read that had some information on what guys are really using.

Here's a picture of what I'm trying to accomplish. And a picture on the one block I've found only issue is it is 1/4npt but I thought I could probably drill it larger and retap the ports.
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File Type: jpg Screenshot_20161009-221837.jpg (125.2 KB, 138 views)
File Type: jpg Screenshot_20161009-220606.jpg (113.0 KB, 121 views)
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2013 Chevrolet 3500hd duramax loaded ltz cc/lb dually (tow pig)- built motor by me, exergy 10mm cp3 swap, danville 2.5 stg1.5 charger, 5" afe exhaust, wehrli charge piping and egr delete,wehrli stainless downpipe and danville tuned. 5" zone lift, 315/70r17. 2" hub centric front spacers 3" hubcentric rear spacers between duals.

2008 Chevrolet 3500hd duramax ltz cc/lb dually (homemade handgrenade) built motor by me, Built tranny by me, big exergy pump and s&s over it, large exergy lbz injectors, ac delete, custom Danville s400 true 2.5 charger, roll pan, 8" single stack, custom hitch and a few more pulling goodies.

2015 Vw passat tdi sel premium blacked out(old lady's ride)

2014 chevrolet cruze diesel work car.

Special thanks to Danville Performace & Limitless Diesel
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Old 02-22-2017, 07:14 AM
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Speedway or jegs y blocks
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Old 02-22-2017, 07:22 AM
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I bought mine return block from gainger, as far as the supply block, I just used a AN to AN Y from JEGS to reduce the fitting used. Still seems to be working fine. This is the return block I used, outlet on the drives side and fuel temp sender on the other. https://www.grainger.com/product/2KH...rders_WillCall
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Old 02-22-2017, 08:29 AM
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I just started doing this too just wanna say thanks for starting this thread same time ima do it 😎
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Old 02-22-2017, 08:44 AM
Blackmax123 Blackmax123 is offline
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I like that block from grainger. Looks like it's be good enough to run for my supply. Then maybe get the smaller block to plumb in all the returns.
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2013 Chevrolet 3500hd duramax loaded ltz cc/lb dually (tow pig)- built motor by me, exergy 10mm cp3 swap, danville 2.5 stg1.5 charger, 5" afe exhaust, wehrli charge piping and egr delete,wehrli stainless downpipe and danville tuned. 5" zone lift, 315/70r17. 2" hub centric front spacers 3" hubcentric rear spacers between duals.

2008 Chevrolet 3500hd duramax ltz cc/lb dually (homemade handgrenade) built motor by me, Built tranny by me, big exergy pump and s&s over it, large exergy lbz injectors, ac delete, custom Danville s400 true 2.5 charger, roll pan, 8" single stack, custom hitch and a few more pulling goodies.

2015 Vw passat tdi sel premium blacked out(old lady's ride)

2014 chevrolet cruze diesel work car.

Special thanks to Danville Performace & Limitless Diesel
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Old 02-22-2017, 09:44 AM
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What about McMaster Carr?

https://www.mcmaster.com/#standard-manifolds/=16gt8yd
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Old 02-22-2017, 09:53 AM
Blackmax123 Blackmax123 is offline
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That's exactly what I was looking for. Thanks a lot for the link. I'm gonna order a couple.
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2013 Chevrolet 3500hd duramax loaded ltz cc/lb dually (tow pig)- built motor by me, exergy 10mm cp3 swap, danville 2.5 stg1.5 charger, 5" afe exhaust, wehrli charge piping and egr delete,wehrli stainless downpipe and danville tuned. 5" zone lift, 315/70r17. 2" hub centric front spacers 3" hubcentric rear spacers between duals.

2008 Chevrolet 3500hd duramax ltz cc/lb dually (homemade handgrenade) built motor by me, Built tranny by me, big exergy pump and s&s over it, large exergy lbz injectors, ac delete, custom Danville s400 true 2.5 charger, roll pan, 8" single stack, custom hitch and a few more pulling goodies.

2015 Vw passat tdi sel premium blacked out(old lady's ride)

2014 chevrolet cruze diesel work car.

Special thanks to Danville Performace & Limitless Diesel
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Old 06-13-2017, 09:06 PM
Kunz111 Kunz111 is offline
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Bumping this back up as I'm putting a s369sxe and 10mm stroker on my truck right now and I just saw how much of a cluster mess the stock fuel line stuff is, I would like to switch everything up also. I have been doing a lot of reading but I'm still really confused about things and I was wondering if someone could help me understand this better.

As I look right now at the stock stuff The big feed line comes into the engine bay goes across the top of the cp3 to where the stock fuel filter house would be but sense mine is deleted it's a hose that connects back to a hard line where the pressure test port is, splits to a T , the hard lines go to the back side of the ybridge, and one goes to a rubber hose and then the cp3 and the other goes back to the driver side head area and Ts off again where one goes to another rubber hose and then the cp3, and the other one goes towards the firewall where it has a fuel temp sensor the return line to the tank and another rubber hose going to the driver side fuel rail.

So all of that would get pulled out and then would I run a 8 an up to the cp3? Then get a block and run the return from the cp3, fuel rail, and the injectors too? Also put the fuel temp sensor in. Am I kinda close or am I way off here?
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Old 06-14-2017, 02:25 AM
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Quote:
Originally Posted by Kunz111 View Post
Bumping this back up as I'm putting a s369sxe and 10mm stroker on my truck right now and I just saw how much of a cluster mess the stock fuel line stuff is, I would like to switch everything up also. I have been doing a lot of reading but I'm still really confused about things and I was wondering if someone could help me understand this better.

As I look right now at the stock stuff The big feed line comes into the engine bay goes across the top of the cp3 to where the stock fuel filter house would be but sense mine is deleted it's a hose that connects back to a hard line where the pressure test port is, splits to a T , the hard lines go to the back side of the ybridge, and one goes to a rubber hose and then the cp3 and the other goes back to the driver side head area and Ts off again where one goes to another rubber hose and then the cp3, and the other one goes towards the firewall where it has a fuel temp sensor the return line to the tank and another rubber hose going to the driver side fuel rail.

So all of that would get pulled out and then would I run a 8 an up to the cp3? Then get a block and run the return from the cp3, fuel rail, and the injectors too? Also put the fuel temp sensor in. Am I kinda close or am I way off here?
Sounds like you get the drift!

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03 Chev CC SB ZF6-Gone
04 GMC CC SB SLT LLY
597/1096 Batmostocker-Gone

06 GMC CC DRW-Gone
08 GMC CC DRW-Gone
New DD/Beater: Beat up 06 GMC CCSB w/ 252,000 miles
Current Tow Rig-12 Ram 4500 Crew


'Oughta K
now Better'- PPL Lim Pro Stock 05 3500 Crew Cab 158" WB 2014 PPP 2.6 Champions
Thanks to Blackout Performance

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Old 06-14-2017, 03:55 AM
Blackmax123 Blackmax123 is offline
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Hopefully I'll put the finishing touches on mine tonight. I left the fuel temp sensor where it is. I cut the fuel return tune off the junction block where the fuel temp sensor is and threaded it. Then installed a pipe plug to block it off. I then cut the hard line and got a compressor fitting from Carl's that goes from hard line to -6 An.

I got block from mcmastercarr and made a mount to place them right beside the two big engine harness bale connectors.
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2013 Chevrolet 3500hd duramax loaded ltz cc/lb dually (tow pig)- built motor by me, exergy 10mm cp3 swap, danville 2.5 stg1.5 charger, 5" afe exhaust, wehrli charge piping and egr delete,wehrli stainless downpipe and danville tuned. 5" zone lift, 315/70r17. 2" hub centric front spacers 3" hubcentric rear spacers between duals.

2008 Chevrolet 3500hd duramax ltz cc/lb dually (homemade handgrenade) built motor by me, Built tranny by me, big exergy pump and s&s over it, large exergy lbz injectors, ac delete, custom Danville s400 true 2.5 charger, roll pan, 8" single stack, custom hitch and a few more pulling goodies.

2015 Vw passat tdi sel premium blacked out(old lady's ride)

2014 chevrolet cruze diesel work car.

Special thanks to Danville Performace & Limitless Diesel
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Old 06-14-2017, 05:05 AM
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Post some pics up as you guys do this , I'd like to see how it looks.
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Old 06-14-2017, 05:10 AM
Kunz111 Kunz111 is offline
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Awesome now I have a couple of more questions. How does everyone get the injector return lines connected to the fuel block? Those lines are very small. Also for the cp3 do I have the feed and return ports pointed out right?

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Old 06-14-2017, 05:13 AM
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You have the feed & return switched

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04 GMC CC SB SLT LLY
597/1096 Batmostocker-Gone

06 GMC CC DRW-Gone
08 GMC CC DRW-Gone
New DD/Beater: Beat up 06 GMC CCSB w/ 252,000 miles
Current Tow Rig-12 Ram 4500 Crew


'Oughta K
now Better'- PPL Lim Pro Stock 05 3500 Crew Cab 158" WB 2014 PPP 2.6 Champions
Thanks to Blackout Performance

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Old 06-14-2017, 06:45 AM
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When I did my return block I found that the -3an fittings for brake lines fit well on the injector returns so I used that to get them to my return block. Haven't had them leak at all.

As for a return block I made my own.
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Old 06-14-2017, 10:10 AM
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