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Topic Review (Newest First)
07-08-2012 06:43 AM
stykthyn the vortech trex kit is a decent piece. professional products makes an electric in line pump but I really cant stand professional products.
To be honest though there is going to be be some fabrication or the use of an install kit to make an aftermarket pump work.
07-07-2012 09:37 PM
Ibuildembig Nope, not even close to being a direct fit. I bought one and decided against a bunch of mods to make it work and with some buddies who run them with 50 percent success in their street cars it wasnt something I was willing to take a chance with. 66psi is gonna require a pretty big pump.
07-07-2012 09:34 PM
stykthyn In tank pump. You need to modify the connectors for the wiring. I ran one on a warmed over ls1 and it had no problems. They can support 500hp or so.
07-07-2012 09:31 PM
2xs
Quote:
Originally Posted by stykthyn View Post
Walboro 255
Thats an in-tank pump, is it a direct fit in place of the Jeep in-tank pumps?

Might have to use that myself when I do my Vortec swap.
07-07-2012 09:29 PM
stykthyn Walboro 255
07-07-2012 09:20 PM
2xs The pump is set up for a 2.5, even if it could produce the pressure, you will have a volume issue, that 350 drinks WAY more juice then any 2.5L

Perhaps use the 2.5L pump as a primer for a frame rail pump....
07-07-2012 07:46 PM
Nojdog
NEED HELP! Fuel delivery for l31 350 vortec conversion in YJ

I have a 1988 yj with 4 inch suspension, 3 inch body and 35 in tsl swampers. I recently put a 350 vortec l31 engine and transmission out of a 1999 yukon in it. I used aa saddle engine mount. I got a conversion adapter from jtr to match up my hybrid np231C/np231J with ss slipyoke eliminator transfer case to the 4L60 4x4 tranny. I custom built the transmission mounts located on the transfer case to the jeep skid plate so I could use the s10 tranny mts. It turned out really solid and fits perfect like the stock yj. A guy out of arkansas made a stand alone wiring harness out of my original l31 harness for $320 bucks. All I need to do now is find a cheap 23.5in rear drive shaft with u-joints on each end with the slip shaft setup in the middle of the shaft. I am very aware that I am gonna have to do a rear axle conversion at minimum to handle the tires and added power.

The problem I'm having is with fuel delivery. I got a 20 gallon tank/fuel pump out of a 1993 2.5 yj donor I bought. I really need to know if the 2.5 liter pump is going to produce the 66psi I need to run the L31 vortec engine? I'm not sure, but I heard a rumor that the L31 has a fuel regulator on the fuel rail on top of the engine. Also...will the stock fuel pump in the 1993 2.5 produce the psi I need? If not, is there another pump I can replace it with in the tank. My friend told me Walboro makes a pump that should fit, but I don't know the part number! I don't want an out of tank fuel pump. PLEASE HELP! I'm ready to get this beast rolling!

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