Checking rail pressure while cranking

[Rawze]

(11-10-2019 )Konstantin Wrote:  

(11-10-2019 )tree98 Wrote:  Does it only do this after it has sat for a period of time? Could be the check valve is bad and bleeding off the prime.

sometimes yes, but sometimes it does it for no reason when engine is still. especially if i try to crank it right away, without giving it 10-15 seconds ignition time. how do i check check valve?

It is not good for commercial vehicles to be cranked up like a car... you are supposed to always wait until all the systems do a self check before cranking to prevent electrical surges while the systems are doing their self checks.
similar thread... http://rawze.com/forums/showthread.php?t...2#pid30002