Just dropped the trailer off at storage after racing all weekend. FP and RP have been great, as always. Usually see 16-19psi all the time. Coming home the RPG starts flashing at me. Every time I am off the throttle, it drops to 0-4psi. On throttle it shows 14.

RP drops when FP drops, so I dont think its a flaky sender. Basically it acts like the CP3 is pulling fuel when it needs it, but the FASS isnt providing positive pressure.
Maybe the return is messed up? No leaks, no completely unusual sounds, though the FASS has been getting a bit louder over the past few weeks.

Never had Bio in it and the filters have maybe 5-10k on them.

DieselDan?

 

Do you have a fp isolator. If so, I bet that's the culprit.

 

Thanks for responding!
Unfortunately, the FP sender is on the CP3,and even if it was the FP sender, it would not explain the RP drop as that is reading off the factory sender.

I gotta believe that the return check ball has some goo in it or something. I'll call Dan in the AM if he hasn't already PM'd me.

 

Did we talk about this yet? I dont know why my searches randomly leave stuff out.....

 

yeah, I called you on this issue. Weirdest thing though...I r&r'd the return spring and greased up the ball, put it back together and havent had an issue since. Everything looked ok in there, but who knows!