DWeiler,
I have a 110 gal aux tank in the bed. When I was drawing from it with the AirDog I would run it down and then pump the original tank up into the aux tank. Because the aux tank is so big there where times when I would go around a cloverleaf or stop suddenly and for an instant the fuel level would go below the bottom of the draw tube causing the light to come on. It comes on instantly at 7 psi.
jeepit,
The last time I changed the AirDog filter I knew it had been a while. When I got the filter off and looked at the miles I had written on it I realized there were 150,000 miles on that filter!!!! I buy all my fuel from a certain truck stop chain and this showed I have never gotten bad fuel from them.
BTW, I don't necessarily recommend going that long, but that is when I started noticing lower fuel psi.
Godspeed,
Trent