Fuel Gauge Wacky - High Fuel Pressure

[COSEng]

I installed a DiPricol 0-30 fuel pressure gauge Sunday.



Took it for a drive and the pressure flucutated between 5 and 8 pounds driving around town. Great, just what I expected, and I was enjoying having the addtional gauge in the truck.



Went to work this morning... again between 5 and 8 pounds. I was almost at work, stopped at a traffic light, looked over and the gauge was reading 25 psi. What the heck! The stock lift pump can't make this kind of pressure. Decided to wait and see what happend on the way home.



Got in the truck after work, and the gauge was still reading 25 psi. On the way home it it slowly pegged to 30 psi.



Once home I bled both sides of the diaphram a couple of times. The gauge would go to zero and then return to 22 -25 psi reading at idle.



Ideas? Did the gauge go bad already?



Thanks for the help,



Carl

 

[R_Painter]

I had a similar problem with my electric fuel pressure gauge seems a tiny piece of dirt or something got into the sending unit and caused the problem I replaced the sending unit and no problems since. I thought something was funny when I was reading 80 psi of fuel pressure at idle!! Got to love those walbro fuel pumps.

 

[COSEng]

I there any way for the return line from the CP3 or the rail pressure relief valve creating higher pressures in the feed line to the CP3? This is the only other idea I have other than the gauge is bad.



I am not running an aftermarket transfer pump, and I don't think the stock (on the side of the filter) one can make 30psi.