Melissa the part you are refering to as the accumulater pump is actually called the accelerator pump. This could be adding to the confusion for parts. Yes the truck can run with the inline fuel pump. In fact if the mechanical pump fails it too can leak gas into the oil. There were no V6 engines in 69 only inline 6's. They were 240 and 300. Casting numbers on a carb rarely if ever have anything to do with engine size. Does your hubby have any way to send a pic? It might help figure out what carb you have.