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2004 L59 5.3L fuel return line question

 
Old 05-27-2018, 09:32 AM
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Default 2004 L59 5.3L fuel return line question

OK, so I picked up an 04 L59 for a 95 Jeep Wrangler YJ build. The Wrangler runs a 100 psi fuel pump return style system. I'v been reading about the L59 fuel rail return setup and need some clarification on how to connect up the fuel lines.

To connect up the return setup, do I just connect the factory Jeep return line to the return connector on the L59 fuel rail? I've also read about people both connecting and disconnecting the vacuum line to the fuel rail regulator. Just looking for clarification to make sure I get everything plumbed up properly.

Last edited by forcefeedws6; 06-07-2018 at 09:24 PM.
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Old 06-07-2018, 09:26 PM
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I was originally looking to run a corvette style inline filter/regulator, but I think this L59 has the regulator and return line built into the fuel rail.

Anyone have any insight into this L59 fuel rail connection?
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Old 06-08-2018, 06:43 AM
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Yes, you connect the return line to the return line fitting..
And the vacuum line on the regulator is to pull down fuel pressure at idle.
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Old 06-08-2018, 06:27 PM
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Originally Posted by JoeNova View Post
Yes, you connect the return line to the return line fitting..
And the vacuum line on the regulator is to pull down fuel pressure at idle.
Got it!! Never messed with one of these L59s before. Thanks for the help!!
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Old 06-08-2018, 06:40 PM
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Um,, just a note,, the stock YJ fuel system runs at about 48PSI max,, while the pump can do 100,, it doesn't last too long..
They are very inexpensive ,, if your running the stock YJ fuel tank if you have the pump out for some reason, cut the end
off the in tank end of the return pipe and shorten the fuel pump pipe as well (About 1" shorter) the YJ tanks shrink with age
and exposure to Alcohol and can block the end of the return driving your pressure to pump max .. < This is how I found out they don't like running full pressure..
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Old 06-09-2018, 10:04 PM
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Originally Posted by pdxmotorhead View Post
Um,, just a note,, the stock YJ fuel system runs at about 48PSI max,, while the pump can do 100,, it doesn't last too long..
They are very inexpensive ,, if your running the stock YJ fuel tank if you have the pump out for some reason, cut the end
off the in tank end of the return pipe and shorten the fuel pump pipe as well (About 1" shorter) the YJ tanks shrink with age
and exposure to Alcohol and can block the end of the return driving your pressure to pump max .. < This is how I found out they don't like running full pressure..
That's good to know. I haven't made it to the rear of the Jeep yet but I'll add this to the list of things to check. Thanks
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Old 04-18-2019, 06:35 AM
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How did the build go? I just bought an 04 L59 to go in my TJ.
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