when start truck it is at about 17psi and drops to about 12 at WOT but sometimes it goes up to 23psi at idle and will stay that way but when I mash pedal it goes down to 20psi at WOT but the needle is VERY bouncy and truck seems to studder a little does this sound like a gauge issue or a airdog issue

 

you running an isolator with the FP gauge??

 

I'm having similiar issues....fp is all over the map...happened before the AD150 install as well, so not the pump...swapped the Quad FP sender, so shouldnt be it....guess it's the guage or wiriing?

Idle is 12-15psi, cruise is 8-15psi, WOT no less than 8psi...

 

no its an electric dipricol

 

Where are you picking up you reading for fuel pressure from? Do you have the snubber installed?

 

whats a snubber and I installed a brass t fitting in the 1/2 inch line coming from the airdog beside the framerail as it bends to go up to the dual fuelers I was also having a similar issue with the rail pressure gauge but DIPRICOL said that issue is due to the 06,07 trucks with dual cp3's. They said their gauge cant take in all the info correctly and it wacks it out. They are working on a harness modifcation and should have it to me in 2 to 3 weeks. And for the record I am grounding the gauge to the frame and taking power from the ignition fuse in the fuse box in engine compartment drivers side all other gauges work fine