Fuel Pressure Adjustment?

[lxsteed]

I'm running really low on my pressure gauge, Just put it in, along with a kirban regulator. How do I adjust it properly, and does tightening the nut give more pressure, or less?

 

[04sleeper]

If you tighten the screw it will increase fuel pressure. The nut locks the adjuster screw in place once the fuel pressure is set.

 

[lxsteed]

If you tighten the screw it will increase fuel pressure. The nut locks the adjuster screw in place once the fuel pressure is set.

So its the screw that adjusts the fuel pressure, not the nut?

 

[04sleeper]

So its the screw that adjusts the fuel pressure, not the nut?

Correct. The nut just locks the setting in place.

 

[lxsteed]

Cool, now with my setup, what should I set it to? 40-42 psi?

-306 c.i. short block
-GT-40 heads
-1.7 Crane Cams Rockers
-E303 camshaft
-C&L 73 mm MAF Sensor
-70 mm Throttle Body
-Kenne Bell performance flip chip
-MSD 6A Ignition Module
-PA Performance 200 amp 3G alternator
-Walbro 255 lph Fuel Pump
-Motorsport 24lb injectors
-Kirban Fuel Pressure Regulator w/ gauge
-Mac 1 5/8" ceramic coated shorties
-MAC ProChamber H-Pipe
-Mac Catback w/ 2.5in chrome tips
-3 core heavy duty radiator w/ Mark VIII Electric Fan
-Hurst Competition Plus shifter w/Tri-Ax handle
-Moroso Cold Air Kit w/ K&N filter

 

[04sleeper]

I would start around 38 and go from there.

 

[lxsteed]

Ok, I think I just broke my FPR, I had it set, then tightened the nut, and now the screw is loose, and just turns. It doesn't tighten.

 

[5spd GT]

Well to answer the original question: Set your FP (I have a Kirban also) when the car is at operating temp (warm)/at idle/ and with the red vaccum line disconnected from the regulator with something plugging the hose hole...and turn the "long" stud (black) sticking up...turn it clockwise to turn FP up...and counterclockwise to turn it down...and then tighten the nut at the bottom of the stud just about "hand tight"...so it isn't enough to break anything and just enough so vibrations don't cause it to lose the setting...

Adjust in 2lb increments and drive it and see what drives the best and provides good power...

Well check for cracks or broken threads (from the nut or stud)...but just confirm it is broke before buying another one...they are fairly cheap though as you know...to replace...

Good Luck with it and I hope it isn't broke...little things like that stress me out...

 

[rsw007]

nut tighten to regulator not screw. just wanted to make sure you got it right.