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4.8 swap

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Old 02-12-2018, 02:47 PM
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Have a 2010 4.8 from a truck. My question is the fuel rail being stock intake. What line is the supply and what one is the return line or how do you tell them apart. Thanks Nate
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Old 02-12-2018, 04:51 PM
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Usually the return is a slightly smaller diameter line. Does your fuel rail have the built in regulator?
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Old 02-12-2018, 07:54 PM
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No it does not have a regulator. I purchased the LS kit from speedway with regulator. Was going to tie the return from the intake and the return from the regulator together back to fuel cell.
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Old 02-12-2018, 10:10 PM
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If you're going to use the LS style (Corvette) reg -- just tie the supply from the reg into the fuel rail. Block off the manifold return -- the return will be from the REG.
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Old 02-13-2018, 07:26 AM
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Originally Posted by Michael Yount View Post
If you're going to use the LS style (Corvette) reg -- just tie the supply from the reg into the fuel rail. Block off the manifold return -- the return will be from the REG.
Thank you.
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Old 02-13-2018, 08:43 AM
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Originally Posted by Oconto View Post
No it does not have a regulator. I purchased the LS kit from speedway with regulator. Was going to tie the return from the intake and the return from the regulator together back to fuel cell.
If your fuel rail has a return line on it, then it has a regulator on it.
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Old 02-13-2018, 09:43 AM
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Originally Posted by JoeNova View Post
If your fuel rail has a return line on it, then it has a regulator on it.
How would I tell if it does or not? I was told being a 2010 they didn't have a regulator on them. If so then would I not need to run a regulator and just go from pump to intake?
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Old 02-13-2018, 12:06 PM
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Perhaps, looks something like this?

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Old 02-13-2018, 06:36 PM
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Pic of the OP's fuel rail -- driver's side....

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Old 02-13-2018, 11:47 PM
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In the last picture I only see a feed, no return.
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Old 02-15-2018, 05:12 PM
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Thanks to the help from members. We figured out there is no return on this motor. The line in question with the green can is a emission line and not connected at all to the fuel rail. I will be plugging it off and using the corvette style regulator running the return on it to my fuel cell and the feed line to the intake. Thanks Again for all the help. It is awesome to have good resources when unsure.
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