LSx fuel plumbing diagram

onetoncrawler · Jun 2, 2010

so i have a 255 pump, filter/regulator, and a fuel cell with 2 fittings. hooking up to a 5.3 vortec
couple of questions

1. anyone have a diagram for plumbing everything with the return and all
2. is a vent necessary for these systems?
3. if a vent is required can i put a y off of the return or will i have to add a fitting to the cell?

BamaTJ · Jun 2, 2010

I am pretty sure you will need 3 fittings for a fuel injected setup.

onetoncrawler · Jun 2, 2010

I think you are right Matt, and i think this would be a good time to add the ball valve vent port to meet Xorra rules

I guess the thing that is confusing me the most is I have seen some people post a diamgram of the regulator after the fuel rails that splits off to the return, since my regulator is built into the filter i obviously dont want to run it after the rails unless i install a pre-filter

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hinton · Jun 2, 2010

my system comes out of the tank to the 255 pump then to the filter/reg and the return goes to the tank and one line straight to the motor. then i would add the ball valve vent and call it done

i might have some pics in my build of my fuel system its setup the same way yours will be if not i can take some and post them just let me know

patooyee · Jun 2, 2010

onetoncrawler said:
I guess the thing that is confusing me the most is I have seen some people post a diamgram of the regulator after the fuel rails that splits off to the return, since my regulator is built into the filter i obviously dont want to run it after the rails unless i install a pre-filter

What is "it" in the above statement?

J. J.

onetoncrawler · Jun 2, 2010

JJ i looked through all your post on Pirate thinking i would see some info but didnt find what i was looking for.

the it i was talking about was the filter/regulator

does this look correct???

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onetoncrawler · Jun 2, 2010

hinton said:
my system comes out of the tank to the 255 pump then to the filter/reg and the return goes to the tank and one line straight to the motor. then i would add the ball valve vent and call it done

i might have some pics in my build of my fuel system its setup the same way yours will be if not i can take some and post them just let me know

couldnt find any pics in your thread but if you get time that would be great!. Thanks

jrhall · Jun 2, 2010

Why dont ya just l;ook on my jeep.... It is the same setup you will have :wtflol:

onetoncrawler · Jun 2, 2010

jrhall said:
Why dont ya just l;ook on my jeep.... It is the same setup you will have

idk.... lol .. i didnt have your jeep at work when i was trying to figure that **** out :****:

i figured it would be general knowledge that would be posted everywhere on the net :flipoff1:

Toddy · Jun 3, 2010

Don't 5.3's have the regulator built into the fuel rail? Mine does and the return comes off the fuel rail right next to the supply inlet. The LS1 has a seperate regulator and you can mount it next to cell and have a short return. This is all on earlier model motors that I have delt with.

patooyee · Jun 3, 2010

The reason there's not many diagrams on the net is because there's a million different ways you can do it. But the diagram you drew looks like a stock LS1 setup which should work fine and is what I'd say 90% of the folks out there do.

J. J.

Juan_Hong_Loe · Jun 3, 2010

Toddy said:
Don't 5.3's have the regulator built into the fuel rail? Mine does and the return comes off the fuel rail right next to the supply inlet. The LS1 has a seperate regulator and you can mount it next to cell and have a short return. This is all on earlier model motors that I have delt with.

If I'm not mistaken anything after 03 the regulator was in the pump and there is no return line on the rail.

onetoncrawler · Jun 3, 2010

Thanks guys, mine is a 99-00 model... ill look at JR's and get it figured out. if something is different from the diagram i drew i will fix it and post it back for future reference

patooyee · Jun 3, 2010

FYI, here are some other ways to do it from Aeromotive's website:

http://aeromotiveinc.com/wp-content/uploads/2010/02/09Aeromotive_EFI_PowerPlanner.pdf

Obviously, their brand components can be subtituted with other brands if you desire.

J. J.

patooyee · Jun 3, 2010

Juan_Hong_Loe said:
If I'm not mistaken anything after 03 the regulator was in the FILTER and there is no return line on the rail.

I think this is what you meant ...

J. J.

1TONZR2 · Jun 3, 2010

onetoncrawler said:
Thanks guys, mine is a 99-00 model... ill look at JR's and get it figured out. if something is different from the diagram i drew i will fix it and post it back for future reference

your regulator should be on the rail already. my 02 5.3 is that way.

BamaTJ · Jun 3, 2010

I also think this is the case. My 5.7 is an older motor but it has a built in regulator also

onetoncrawler · Jun 3, 2010

yep it seems that the kit i bought is for an ls1 which requires the regulator, but the gen III motors have the regulator built into the fuel rail

so i guess i will give my filter/regulator to a friend who will be running a LS2 in his buggy.....if it needs one :dunno:

Toddy · Jun 3, 2010

http://www.summitracing.com/parts/RUS-640850/

http://www.summitracing.com/parts/RUS-640860

Buy these. Makes it alot easier. Then jusy plumb it big one is feed and little one return.

Toddy

onetoncrawler · Jun 3, 2010

Toddy said:
http://www.summitracing.com/parts/RUS-640850/

http://www.summitracing.com/parts/RUS-640860

Buy these. Makes it alot easier. Then jusy plumb it big one is feed and little one return.

Toddy

yeah , i got those, they came in this kit... http://www.speedwaymotors.com/LS1-Fuel-Delivery-Kits,41791.html ....i thought it was a good price and had a coupon to Speedy Bill's so i ordered this instead of a Walbro pump