Re: Need advice: LS ENGINE SWAP
 

All truck pumps have metal reservoirs. The injuctors will have a more square connector rather than a rectanguler one.

Re: Need advice: LS ENGINE SWAP
 

None if you don't try to run it as flex fuel. Just hook it up as a regular gas engine and you'll be fine. The older ones has an extra fuel composttion sensor, but not sure on the newer ones. Personally I think the whole E85 thing is crap as it doesn't really have any benefits, sure it costs a little less, but its almost impossible to find in most areas, and you get fewer MPGs with it so its a wash, and it eats rubber parts and is corrosive. Just run normal gas and be done with it.

Re: Need advice: LS ENGINE SWAP
 

...Sorry ! LS1 just answered this

Re: Need advice: LS ENGINE SWAP
 

Sorry for my ignorance but whats an E85 ? how can I tell if I have it ?

Re: Need advice: LS ENGINE SWAP
 

Haha! This is probably because you live in California. E85 is ethanol fuel, the 85 part means its 85% ethanol and only 15% gas. Its what flex fuel cars can run on. You can find it here in the midwest if you really look for it, but its hard to find, I'm guessing you may not even have it in San Diego.

Re: Need advice: LS ENGINE SWAP
 

Lol ! OK, yeah your right...have not seen any here in San Diego at all... Ok now this makes sense to me.

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.

Re: Need advice: LS ENGINE SWAP
 

Thanks BR3, good to know !

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.

Re: Need advice: LS ENGINE SWAP
 

so I have the newer and returnless, and should be at 58psi ?

Re: Need advice: LS ENGINE SWAP
 

If you use a Corvette filter/regulator, then yes it should be at 58psi.

Re: Need advice: LS ENGINE SWAP
 

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.

Re: Need advice: LS ENGINE SWAP
 

where can I get one of those ? Summit ? is there a certain model or part # ?
thanks in advance.

Re: Need advice: LS ENGINE SWAP
 

33737 is the one i just bought, since i messed my first one up

Re: Need advice: LS ENGINE SWAP
 

btw....mine should be firing up tonight:metal::metal::metal:

Re: Need advice: LS ENGINE SWAP
 

Thanks brother !!
Right on man ! :metal: hope it works without any troubles for you hopefully in a couple of weeks I will be saying the same thing !

Re: Need advice: LS ENGINE SWAP
 

no problem man....and me too

Re: Need advice: LS ENGINE SWAP
 

it's not just the regulators that are different on the flex fuel motors. the injectors are different too.

Re: Need advice: LS ENGINE SWAP
 

The old vacuum regulated return style fuel rails will pull down the PSI, and it may be low on the newer stuff too with a factory pump, but the Corvette filter/regulator is set at 58psi, so as long as your pump puts out that much, that's what you'll have at the rail.

I'm aware of this, but was trying not to confuse the kid. ;) They will work with regular fuel fine.

Re: Need advice: LS ENGINE SWAP
 

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.

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 ! :)

Re: Need advice: LS ENGINE SWAP
 

Way cool thread.. I'm watching and learning from you guys..

Re: Need advice: LS ENGINE SWAP
 

Thanks trkfrk ! makes at least two of us lol :metal:

Re: Need advice: LS ENGINE SWAP
 

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."

Re: Need advice: LS ENGINE SWAP
 

Thats awesome information LS1 ! I need to make sure fuelinjectionconection knows this information before he flashes my computer !