If its down on the side of the road, I'd probably just get it pulled somewhere you can work on it.
Fuel between injector pump and injectors is high pressure, if there's a leak there, fuel should be spurting out , not air sucking in.
Fuel lines are possible, so is bad fuel. If you leave a injector line loose, you can see it spurt each time it fires. Fire it up and see if the spurting dies out, ie it slows and stops getting fuel. The fuel filter fuel level like paul mentions is another clue.
Honestly you're kind of grasping at straws right now, and I don't have any idea what your problem is, I tend to throw solutions at something until it runs right. If you really want to know if its a fuel delivery issue and it always dies in one minute - Eliminate the fuel lines and tank, and run it off a 5 gallon bucket of good fuel. You'll at least narrow down your issues.