fuel pressure dropping with ampient temp raising.
 

Okay as the ambient temperature outside rises my fuel pressure goes lower. Its not affected by fuel temp which is why I don't get it. As its colder fuel pressure stays up around 18-19 psi no matter if its first starting idling or if I drive for awhile, as it heats up outside, cooler fuel or hot my pressure drops idling to 16psi. Driving around lowest fuel pressure when its colder out is 15 16 psi. Warmer outside 13-14.

What could be the problem? My old raptor did this a little at first and then after a couple months settled down to steady pressure. Don't know if this is a break in process on the airdog or not but its been on since february

I put an airdog on my buddies truck in Feb and he's had no problems, maybe it's the return check valve on the vp?

I don't see why the pressure would change with ambient temperature that much. I would think the return would make more sense if it was fuel temperature related but its more outside temp

what about fuel tank vent? easy to tell just opean cap and se if prob goes away.

Have to wait to try it until its warmer again. Its been in the mid thirty to low 40s last few days

Any other input?

i think you have ice somwhere, either in vent, or fuel system.

Hasn't been cold enough for ice.