is the site to ask these questions. I've got some manuals in PDF format somewhere. If the bus is running good, and you drive it right it can get 10+ mpg; I've heard reports of near 14 mpg. The bus is all aluminum, so it's pretty light for it's size. PD4104's have an air actuated shut-off called a skinner valve, unlike our skoolies which have (usually) an electric shut-off solenoid. It's a common failure point, and difficult to diagnose if you're new to the bus. It'll suddenly shut down, as though it has a fuel blockage (clogged line or filter). It may or may not start back up, when it feels like it. The skinner valve is located on the firewall behind the engine; check the electric connections before you drive it any distance!!!!! Has an air line going to the fuel linkage. Don't ask how I know all this....
No, I no longer have one. There's a HUGE amount of support out on the web; just don't go lookin' on the school bus sites!!
Email me and I'll look for the manuals winnemuccadave@NOSPAMnetscape.net
remove the obvious