neon injectors and FPR?

[jeeptorino68]

dodge neon fuel injector swap

goign to do this on my 92 4.0 HO engine but had a few more questions
i am getting the EV6 4 hole injectors from a neon part number 0280155703 they are rated 22.6 lbs

91-93 4.0 have 21 lb injectors at 39 psi.
do i need to change to the later style FPR to run the neon injectors?


here is what i was reading:
http://www.ausjeepoffroad.com/forum/showthread.php?t=92236

"91-95 Jeeps with Fuel Pressure Regulators (FPR) on the fuel rail.
Stock FPR Chrysler # 5303 0001 Supplies 31psi @ Idle and 39PSI @ WOT

Chrysler # 4418850 or 5277829 or 5277864 (Manufacturer: Delphi, Part#FP10046) Supplies 40psi @ Idle and 48PSI @ WOT Drops straight in, no modifications. ~$40USD on US fleabay. (thanks to coas from cherokeeforum)"



but i have no idea what PSI the neon injectors require
thanks

 

[Talyn]

22.5lb/238cc @ 43.5psi is what the Neon injectors flow. At 39psi they will flow 21.3lb. You shouldn't have any flow problems.

While the FPR info is helpful you don't need it.

 

[jeeptorino68]

thanks for the info i just wanted to confirm this conversion will work with the FPR i have on the jeep right now. i thought it would but i couldn't find where i read that.
thanks

 

[jeeptorino68]

does anyone know if this mod/swap applies to my brothers 99 WJ with the 4.0?

 

[Talyn]

His FPR is on top of the pump on the tank. The only known regulator for that is hesco's unit which is $300 IIRC