Checking rail pressure while cranking

[Lonestar10]

i show in a quickserve parts diagram for a cm-870 IFSM numbered part 42 - check valve 4010078 the only one it shows is above the electric fuel pump. although i did put a cm870 IFSM on my CM871 and it did have the small little check valve on the backside of the IFSM against the engine as my CM871 IFSM did in the CM871 parts diagram the part number is 4076594 Check Valve for the small one on back side. the only thing i see on my cm870 diagram is a pressure regulator above the fuel filter.