Installed a new fuel pressure gauge today and got some strange readings....
Idle seems to be just under 20 PSI but as RPM increases so does the fuel pressure. It got over 30 at ~2600RPM. Wot at 3300 was 22-23PSI. I don't imagine this is normal.

I have a Holley blue feeding the stock lift pump. I'm taking the pressure of a fitting attached to the injection pump inlet.

Any suggestions, or should I even be concerned?

 

Is this on your truck listed in your sig line?? if it is I think it would be normal to rise as the mechanical pump would increase FP as rpm increased, and as you hit redline the electric pump cant keep up with engine(IP) demands for fuel, , if you took the reading from just infront of the IP I'd believe you would get a better grasp on what your FP actually is...no real experience with 12V fuel systems just shooting from the hip

 

I mistyped, I have the fitting on the injection pump inlet.

I didn't really think about the mechanical aspect....Shouldn't the overflow keep it steady?

 

I would think that the mechanical pump would out flow the electric pump at higher RPMS and that at high rpms the electric pump is acting as a restriction which actually robs yor IP of fuel, I dont know much about the 12V but I thought the mech LP pushed up to 50psi and that they were rebuildable and have a filterscreen in them that can be removed and cleaned

I guess the question is Why did you install an electric pump??

 

Heres the screen

http://dodgeram.org/tech/dsl/filter/pre-filt_clean.htm

after a quick search it seems like 22-25 at idle, 32 or so at WOT

 

Your fuel pressure should increase with increasing rpms. The overflow valve lessens the pressure fluctuation but since it is only a spring, doesn't get rid of it. The reason that your pressure had dropped at WOT, is that you are using enough fuel to cause it to drop.

Your readings are normal.

 

Okay, thanks.

I installed the the Holley because the long run on the vegetable side made it so it couldn't keep up.

 

Your numbers are totally normal even without the additional pump.
Both my trucks measure almost exactly the same as yours.

 

12V fuel pressure specs are: 17-22 at idle and 25-35 at 2500 rpm's no load.So you are right in the ballpark.