Adjustable Fuel Pressure Regulator
Modified Brand New Mopar units, no more core charge!
Available for RENIX motors now!
We '91-'95 and Renix guys have a nice advantage over the later model Jeeps, the fuel pressure regulator is mounted up front on the fuel rail instead of in the tank. Boost your fuel pressure to deliver more fuel and correct a lean condition that may be too much for an adjustable MAP sensor to overcome.
Rebuilt, brand new, black factory units with a billet aluminum rear with an adjusting setscrew/ vacuum nipple unit, new o-rings, and instructions. No need for a modified bracket. You must obtain a fuel pressure gage to set this up properly. Only slightly longer than stock units, no fitting!
This setup did very well on my heavily modified 4.0L YJ with exhaust, intake and 63mm throttle body at 42 psi(stock pressure at wide open throttle is 39psi).
$150 plus shipping 
Now available for Renix motors.
Fuel pressure adjuster rebuilt from new units for the '87-'90 4.0L.
Prices are $150.00 with no core charge, no core return.
'88-'90 Renix
MAP sensor adjuster
Use the FPR for coarse adjustment and add a MAP sensor adjuster for a fine adjustment! Yes, I was skeptical too, but these things work. Tweek the voltage being sent to your Map sensor up to increase the fuel injector pulse width at wide open throttle!
My own Adj Maps with custom etched circuit board and the smallest components available, not hobby board junk.
Only .5 inch by 1 inch, tiny! $25 each.
