Re: Need advice: LS ENGINE SWAP
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Re: Need advice: LS ENGINE SWAP
Ast for the flex fuel thing; it also means that your pressure regulator will run a few psi lower than the standard truck FPR. Its worth mentioning so you don't panic if you test fuel psi and it is lower than 58.
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Re: Need advice: LS ENGINE SWAP
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Re: Need advice: LS ENGINE SWAP
On a returnless system with a Vette filter/regulator it will be regulated at 58psi. The older retutn type with the vacuum regulator it will be a lower pressure.
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That applies to the FF's as well? I thought all the FF's had the lower reg? LOL dammit I thought I had learned something from last time.
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thanks in advance. |
Re: Need advice: LS ENGINE SWAP
33737 is the one i just bought, since i messed my first one up
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btw....mine should be firing up tonight:metal::metal::metal:
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it's not just the regulators that are different on the flex fuel motors. the injectors are different too.
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heck im confused! i was told that if you run FF injectors, you gotta run the FF regulator. correct me if I'm wrong please. I'd have loved to run the corvette filter/reg system on my FF motor.
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Re: Need advice: LS ENGINE SWAP
Ok im getting excited its comming down to D Day but I need to confirm with all the pros out there first on all I should have ready before I begin. We will be pulling the engine this weekend and I would like to do some clean up on the firewall and front frame once its out I know I may need some tbss manifolds because mine wont clear, I have the DD mounts and my wiring harness should be in some time next week If you guys can tell me what else I should start ordering or have ready it would really help me out ! I will start posting some pics as soon as I get the party started but I cant do it with out your guys help I just basically need to know what else I need so we can keep moving. I got all next week off work so I can get alot of the work done and burn some midnight grease...thanks everyone so far you have all been so awesome ! :)
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Way cool thread.. I'm watching and learning from you guys..
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I copied this from an LS1tech post posted by Brenden from LT1swap.com The fuel pressure specs are straight out of GM Service Information online service manuals. "1999-2003 4.8, 5.3, 6.0 all had a fuel rail with 3/8" supply line and a 5/16" return line. The fuel pressure regulator is on the fuel rail, and has a vacuum line to the intake manifold. In 2004, All engines went to a single 3/8" supply line, with NO RETURN LINE (returnless) except 5.3L L59 Flex Fuel vehicles. For 2004, Flex fuel engines KEPT the return line, BUT used a fuel pressure regulator with a lower pressure ratting. 2005 5.3L L59 Flex Fuel engines switched to a single 3/8" supply with NO RETURN line in 2005. Non flex fuel engines, fuel pressure spec is 55 to 62 psi with vacuum line disconnected, fuel pump running. 5.3L Flex Fuel engine 2004 and back, 48-54 psi with vacuum line disconnected, fuel pump running. 2005+ with returnless fuel rail all shared same fuel pressure spec, 55-62 psi. There is no vacuum reference on these, so fuel pressure should remain constant under all operating conditions. The computer is programmed differently for fuel flow rate depending on type of fuel rail. This is important to know when having a PCM programmed." |
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