I previously owned an '01 and had to put a FASS on it. Are these in tank pumps giving any troubles like my old lift pump? Got 40000 on it and feel it's about tome to start worrying.

 

No problems as far as reliability but if you add a chip or programmer you'll see your FP drop to zero assuming you have a gauge.
Lotsa people adding Air Dogs, 53Willys has been ontop of things, look for his thread under "high performance and accessories".

 

01 dodge with intank pump working good don't know pressure
would like to add another lift pump for more pressure

 

I have read of many guys running up to 500 Hp on the stock in-tank lift pump. That being said I would recommend a fuel pressure guage if your shooting for that much or more Hp. I run what's in my signature and have never experienced low fuel pressure.