thanks fellows .i still cant figure it out . what could make it shut down at 60lbs consistantly? thanks jim
Go back and read my post above.
It's shutting down normally. If you watch your shutdown cylinder as the pressure comes up, you''ll see it activate and activate
the fuel cutoff lever. The solenoids are spring loaded, and they won't overcome the spring until the pressure reaches around 60 psi.
It's either the rear control switch is in the off position, or it's one or more of the safety shutdown system sensors related to low oil pressure, high temp, or low water level.
Do you have a manual? Look at the safety shutdown electrical schematic.
By the way, if you air the bus up with shop air, it won't start at all, or, more likely, it'll start and die when you release the start button.
You didn't say what you've done to find the problem. It' working the way it's supposed to. Troubleshoot as indicated above.