I am having a similar problem with my 235 in my 61, but I think my problem is gunk in the tank. I keep sucking big hunks of crap into my pre-pump filter. I am gonna hve to take th tank out and clean it and then flush the fuel lines good. It might be something similar in your truck.

Kyle

"Never tell people how to do things. Tell them what to do and they will surprise you with their ingenuity." - George S. Patton

My Machine