Finally think I figured out the problem I've been having with my 740T.
It started out as a rough idle and noisy fuel pump and eventually seemed
to get a bit worse. I noticed power loss, increased fuel consumption,
and the acceleration was not smooth. Curiously, it would normally run
fine when first started then after driving around for a bit it would
start acting up. Sometimes it was very difficult to start, requiring 20+
seconds of cranking. Replaced the torn hose between the pre pump and
pickup, didn't help. Replaced the main pump with a good used one and
again the same issues. Went in again and replaced the pickup sock since
I noticed it was torn, double checked operation of the pre pump but
still the problem remained. Figuring there wasn't much left, I swapped
the fuel pressure regulator and everything seems to be back to normal.
Smooth, strong acceleration all the way up to the redline, smooth idle,
nice to have everything back to normal. Now that I once again have
dependable transportation I can start playing with the 240.