Im not really sure but on my bus you could go into the afm and bend a metal piece away from the copper piece and the fuel pump would just run all the time. I have a 79 2000cc FI... Yes the fuel injection sucks sometimes but I like it. Good luck...TOG
Just thought I'd inform you this is an inherently unsafe way to run your engine. The fuel pump shuts down on low airflow so that when your engine dies, it stops supplying fuel. As it is, if you broke a fuel line, your engine would stop running but your fuel pump would not, you would pump fuel into your engine compartment, your ignition is on so you have high voltage, so WHEN (not so much IF at this point) the gasoline catches fire your fuel pump will continue to pour fuel into the flames and your bus will go up in a cloud of smoke and flames.
Just a warning.