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- LSx Swaps (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=206)

- - Fuel Line (https://67-72chevytrucks.com/vboard/showthread.php?t=780879)

6.0 LQ4 and stock everything in a 57 panel truck.

Whats everyone generally doing for fuel line and fittings ?

Im guessing for 300HP that -6AN (3/8) together with a few adapter firttings like

3/8 line is the inlet
https://www.summitracing.com/parts/rus-644123

5/16 is the return
https://www.summitracing.com/parts/rus-644113

Seems to be a huge variation in lines and fittings - any recommendations from what you used on your project ?

You got it. Also used the russel hose.

Quote:

Originally Posted by Daaaanz67 (Post 8458684)

You got it. Also used the russel hose.

Thanks.

Just wondering what the difference is mainly.

$59
https://www.ebay.com/itm/Braided-3-8...jf:rk:128:pf:0

$240 with a $40 fuel filter/reg
https://www.summitracing.com/parts/t...it45/overview/

I used all summit brand -6an hose and fittings on mine

Anyone use hardline for main run ???

Two good sites outside of summit. One is a vendor here.

http://www.anfittingsdirect.com/

https://hotrodfuelhose.com

I used AN fittings from fuel rail down the transmission to the frame. From there i used dorman nylon fuel line and stock ptc gm fitting. Cheap quality lines

Check out these fittings GM fuel.line to hose end all in one piece

http://www.russellperformance.com/mc...injected.shtml

ive seen several builds here where the owner is using the plastic hardline....also some use metal lines...MP&C is using all stainless tube on the wagon...its just much easier on me to run the -6 stainless flex....being flexible its easier to route it around stuff...

I used -6 an from my tank to the frame rail where I mounted the regulator/filter then hard line up to the fuel rail and used another short -6 an line. I even covered my hard line with DEI protective sleeve near the exhaust.

Quote:

Originally Posted by FAKKY (Post 8458762)

Wow that's quite a price difference.

Quote:

Originally Posted by FAKKY (Post 8458762)

try not to buy a "kit" you can piece it all together from summit for less than what that kit costs. i also wouldn't buy that cheap chineese crap from ebay but that's me.

make sure to use the "PTFE" hose. it holds up better than other stainless hoses

Quote:

Originally Posted by mongocanfly (Post 8458794)

I used all summit brand -6an hose and fittings on mine

Thanks

Quote:

Originally Posted by 72MARIO (Post 8458920)

I used AN fittings from fuel rail down the transmission to the frame. From there i used dorman nylon fuel line and stock ptc gm fitting. Cheap quality lines

Curious - how come ? - couldnt you have used 3/8 [6AN] dorman nylon all the way with AN fittings still ? AN to barb for example.

Quote:

Originally Posted by 72MARIO (Post 8458923)

Check out these fittings GM fuel.line to hose end all in one piece

http://www.russellperformance.com/mc...injected.shtml

thanks

Quote:

Originally Posted by mongocanfly (Post 8458929)

Thanks I'll look up that build - but think Im abandoning the idea - just doing brake hardlines and flaring and just got me thinking :)

Quote:

Originally Posted by First c10 (Post 8458999)

In a build thread ? Pics ?

Quote:

Originally Posted by bigmoe (Post 8459059)

Wow that's quite a price difference.

Yup.

Quote:

Originally Posted by 77c10bowtie (Post 8459067)

try not to buy a "kit" you can piece it all together from summit for less than what that kit costs. i also wouldn't buy that cheap chineese crap from ebay but that's me.

Im thinking about going the PTFE route on the link I sent above ...... but was curious to find out what others were doing and happy with.

Quote:

Originally Posted by STICKBNDER (Post 8459088)

make sure to use the "PTFE" hose. it holds up better than other stainless hoses

thanks

So .... seems like I have a returnless fuel rail. Pic.

https://i.imgur.com/8IZFbfJl.jpg

I think its simple enough ..... basically fuel pump out to corvette regulator which pressurises to ~58 psi as it passes through to fuel rail. If it sees pressure build it dumps back to the tank vi the return at the regulator.

What confuses me a little is ....

1) Some threads where they say in a returnless system fuel is controlled by ECM as well ...... but that wont happen here right ?

2) Discussions where the FPR in a OEM setup is either on nthe tank or in the fuel rail itself. Not sure. Obviously I wont have 1 in the tank with my tanksinc walbro pump ...... but will have the regulator on the truck trail somewhere.

https://www.summitracing.com/parts/CMB-03-0263

Anyone clarify 1+ 2 a bit better for me ? Probably misunderstanding

I always thought when the pump built up pressure and deadheaded that it shut off...but Eric (ls1nova)says the ecm turns the pump on for x number of seconds when the switch is turned on and then shuts it off till you crank....so I'm going with what he said...best I can tell your rail is returnless...

1vs2...on a returnless rail system the fpr is in the tank and will have a single fuel line to the engine
On a return rail system the fpr is at the fuel rail and the engine will have 2 fuel lines from the tank to the
rail...one pressure and one return..

If your using a intank pump with no bypass then you'll need to run the vett style reg ...and when plumbing it up keep In mind the pressure side is the outer fitting....

Quote:

Originally Posted by mongocanfly (Post 8459313)

Ill be running this pump (Pa-4)

http://www.tanksinc.com/index.cfm/pa...rod/prd609.htm

and this filter/regulator on the frame
https://www.summitracing.com/parts/CMB-03-0263

So the plumbing side is failry self evident (appreciate the info though) ...... but there is no ECM control of the pump. Thats the part that throws me.
So anything need to be disabled etc in ECM ?

Basically just lose that funcionaility that ls1nova talks about above ? It will pump on power on and just self regulate at ~58psi.

On mine I used a psi harness that came with all the wiring and a fuse block...in the fuse block is where my pump gets its power from...this is controlled by the ecm...

*doh* - didnt think of it like that - was thinking of it as a subharness run that goes to the pump - like a special connector etc :)

Thanks guys !!

Thanks mongocanfly

I think you're just overthinking this. The PCM will turn the pump on, but it wont regulate it in any way. How the truck the engine came out of was plumbed is irrelevant if you're plumbing it like an early 2000's Corvette, which is the easiest way to do it , so that's why swaps are done that way.Plumb the Vette filter and let the PCM turn the pump on.

Mongocanfly - that picture just helped me tons!!! I could figure out where the heck that fitting went, but that picture just cleared it up.

Quote:

Originally Posted by ls1nova71 (Post 8459542)

Yes your right. I just didnt think of the pump being powered on by PCM. Thought it would be a straight IGN ON/OFF deal on an aftermarket pump ..... just didnt cross my mind.

What are most people doing with the fuel purge solenoid.

https://i.imgur.com/3JEZq32l.jpg

Blockoff ?

I'll have two vents on fuel tank (1 to above fuel fill intake and other in tank with line vent routed above frame).

Not sure if I need a 3rd ...... but then again ......

They sell delete plates. I just put a bolt through a teardrop piece of metal, welded it, and rounded off the threading to make a nub.

I just take the hose off of it and leave it in. If it isn't bad, and they usually aren't, it will be closed until power is applied to it, so it acts like a block off. It's under the Vortec cover so you wont see it.