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intradomeOffline
Post subject: LS1 evap canister  PostPosted: Dec 30, 2009 - 08:59 PM
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I have a question about hooking up evap canister in LS1. On this picture that I borrowed from the thirdgen.org



the area in the red box is evap canister purge valve. You can see one fuel line connects there, the other goes to the fuel rails.
1. Where in LS1 is the fuel return line?
2. How the excesive fuel gets back to the fuel cell?
3. Does the line from evap canister purge valve goes directly to evap canister? If not where does it go?
4. Is evap canister just hose in and hose out? Some of the units I am checking have some kind of evap canister vent valve harness connector attched to it? I didnt get evap canister yet, but will be getting from camaro ss, thats where i got my ls1.
5. Do I need any vacuum lines connected in the evap system?If so where do they go?

How did you guys connected yours?

Any help appreciated.

Sebastian
 
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intradomeOffline
Post subject: RE: LS1 evap canister  PostPosted: Jan 02, 2010 - 04:17 AM
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I just realized if you were not logged in to thirdgen.org you couldnt see the image. I put the image on my site so now it is visible. Can anybody provide more clues?

Thank you,

S.
 
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jdinnerOffline
Post subject: RE: LS1 evap canister  PostPosted: Jan 02, 2010 - 02:06 PM
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The pressure regulator should have a return line on it. IT is located on the fuel rail crossover tube. If you inspect the fuel rails, are there two ports for fuel?
One, the larger, will be supply and the smaller will be return. The supply can enter the rail setup from anywhere, the return must be connected to the pressure regulator.

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jdinnerOffline
Post subject: RE: LS1 evap canister  PostPosted: Jan 02, 2010 - 02:08 PM
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If you are installing the evap can into a home built car I suggest you use one from an older car. These worked by using engine vacuum instead of an electric switch.

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intradomeOffline
Post subject:   PostPosted: Jan 03, 2010 - 07:15 AM
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Jim,

Thanks for the reply. However I was unable to find the pressure regulator or return line on my intake manifold's LS1(99 camaro ss). There are 2 lines: one that is fuel line the second comes out of evap canister purge valve. After searching the web i found this info on chevytunder.com: "The 1999 and later manifolds, though requiring just a single fuel line, will require a fuel pump assembly that has a built in regulator, or the other two options you may explore is to purchase the fuel filter/line assembly that allows you to install the two fuel lines into it with a single line out to the fuel injectors or can have your single line fuel rail modified for the two fuel lines and regulator added. " So it looks like the pressure regulator or return line is by the fuel pump. What would be the best way to get the return line now?

From guys who had this problem, parts number would be greatly appreciated.

Sebastian
 
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EAMartinOffline
Post subject:   PostPosted: Jan 04, 2010 - 02:50 PM
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On the build that I am doing with an LS1 I am installing an aftermarket pressure regulator between the in-the-tank pump and the fuel rail. The return line runs from the regulator back to the tank.
 
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dleachOffline
Post subject:   PostPosted: Jan 04, 2010 - 03:18 PM
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This is not an eight cylinder question but the people on this thread seem to have the knowledge to answer it.
Would it be possible to use an in-line fuel pump setup instead of the in-tank pump with a Fiero fuel tank? There is too much structure in the way to use Diablo type tanks on a Fiero chassis. Or is it just a bad idea?

Don
Building a 6.0
 
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EAMartinOffline
Post subject:   PostPosted: Jan 04, 2010 - 08:59 PM
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dleach wrote:
This is not an eight cylinder question but the people on this thread seem to have the knowledge to answer it.
Would it be possible to use an in-line fuel pump setup instead of the in-tank pump with a Fiero fuel tank? There is too much structure in the way to use Diablo type tanks on a Fiero chassis. Or is it just a bad idea?

Don
Building a 6.0


You should be able to use an in-line pump, but it might need a smaller pump to feed it. Most high pressure pumps for FI don't suck well and need to be fed with a pump that will suck from the tank.
 
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thewirewizzOffline
Post subject:   PostPosted: Jan 09, 2010 - 07:46 AM
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The ls series gm motors use a single fuel line. The pressure regulator is inside the tank in the pump housing #3 in the pic Cool steve
 
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intradomeOffline
Post subject:   PostPosted: Jan 11, 2010 - 08:30 PM
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Thanks everybody for great suggestions. That gives me a good start.

Sebastian

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