Fuel pressure gauge behaving badly

[headviking]

I have a glowshift FP gauge installed about 2 1/2 years ago. No problems till now. Not all ocations but at idle it shows 61 to 63 psi. When I accelerate the reading bounce upto 100 psi. when I let off. the readings bounce slower and slower (intervals) untill the engine returns to idle, and even then it sometimes will still bounce slower though.
Recently I changed my fuel filters and oil filter with OEM filter (always). I use Rotella T6 and PS for my diesel additive.
The truck drives greal like always and there have been no differance in performance.
I am very anal about my truck. So having this looked at and corrected ASAP is important to me.
Any thoughts to what is causing this and corrective action I may take?
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[DoubleDpsd]

I'd try a new sensor first.

Replacement 0-100 PSI Fuel Pressure Sensor

[headviking]

Update on my "FP gauge behaving badly". Well I order a new sender. Install it last night. Drove for about 15 min. all seems OK. Steady 64psi. This morning after starting the engine, it read 70psi, and after driving for about 10 minutes the jumping began. Jumping more often during acceleration the during idle. by the time I got home 30 min. later it had stopped and settled on 70psi.
Is there anything to check clean or replace?
I own then SGII and Autoengineuity scantool. Using these two tools is there something to check?
Both Fuel filter and oil filters have been replaced about 300 miles. All OEM.

Please suggest anything. I don't want this engine to develop into something worse.

I have no, none what so ever drivability issues at this time. The truck runs smooth and strong.

[DoubleDpsd]

I would try replacing the actual gauge now. after 2.5yrs maybe it has run it's course.

how low does the fp drop at wot?

[headviking]

Originally Posted by darsey715

I would try replacing the actual gauge now. after 2.5yrs maybe it has run it's course.

how low does the fp drop at wot?

Just finished removing and cleaning out the blue spring and plunger.

Still the sam.

With WOT, it drops down to 62-64psi.

[DoubleDpsd]

I would check ALL the wiring and grounds just to rule it out before buying a new gauge actually.

I remember glowshift's tech support being pretty good. See if you can get a video of it and send it to them.

[headviking]

I have heard about doing the bubble test. How do I do this and why?

[headviking]

Strange. After yesterday cleaning out from the fuel bowl to the sender. This morning (about) 3 hours of city and high way driving. My FP gauge is reading 68-70psi. Without any bounce. Now another question is 70psi too high?

[HMM]

I'm glad I'm not the only one, I just happened to notice that mine is pegged out at 100psi. Thinking it went bad because truck runs the same. Time to call edge I guess.

[poorboy1964]

Originally Posted by headviking

Strange. After yesterday cleaning out from the fuel bowl to the sender. This morning (about) 3 hours of city and high way driving. My FP gauge is reading 68-70psi. Without any bounce. Now another question is 70psi too high?

I think 70was the max, I read a thread a while ago that talked about this same thing turned out it was air that got in the sending unit how is yours mounted? they had the strictly diesel fuel line with the bleeder valve at the end of it makes it simple