Here my problem . I have a 1962 Super Major . Starts fine . It will run 2 -3 hours no problems idles /accelerates like it should . Then it will start puffing white smoke . Like it is running out of fuel and then die out . I had a problem with rust in the fuel tank . I have relined the tank , changed out the pre screen in the tank , replaced the supply hose to the lift pump , replaced the lift pump , replaced the primary filter , replaced the secondary filter . The injector pump was rebuilt and installed 4 years ago . My thoughts are the injectors sticking when they get hot ? Injector pump going bad when it gets hot ? I have pulled the fuel cap off but only after the symptoms show up and at that point it may be to late ? I have to wait a couple of hours then bleed the injectors to get to run . After bleeding the injectors and its still warm I'll have the same problem . If I run to the shed and park it the next day it will start and run great for the 2 - 3 hours . I hope someone my have run across before