Interesting reply George. As you know I run my car on veg oil (with 15% unleaded), and one thing on my to-do list is to increase the fuel line size from the tank, as currently at high revs I feel some restriction (or air being drawn in maybe due to high suction).
I think after reading this it is DEFINITELY going to move further up my to-do list!!
I also have a second hand (supposedly good condition dry stored) pump to rebuild for mine (my pump leaks). Could you post any pictures of the pumps you took apart, as one thing I have been concerned about with fitting a second hand pump is potential run away, like in this thread:
http://d24t.com/showthread.php?t=677