PX7 losing prime

[heymccall]

Pete 337 with ISB common rail.
Initially, extended crank times.
Now, if left overnight both filter less than 1/2 full.
Changed check valve on back of the head with no difference.
Installed new filters with no difference.

Runs like a champ. Still pulls the same hill at 53mph, just like when new.

Any idea where else to look???

 

[Truck Shop]

Does it have a fuel water separator?

 

[heymccall]

Resolved...
Fuel supply line from tank to water separator had abrasion and subsequent pinhole at 7 inches back from separator. Line rubbed cab mount ear on frame.

Finally found when changing the separator head. Removal of the separator head and 2 subsequent reinstallations finally opened the hole up enough that it would no longer allow fuel priming.

 

[Coaldust]

Those plastic lines and connectors on the PX engines suck. Thanks for the update.

 

[heymccall]

Those plastic lines and connectors on the PX engines suck. Thanks for the update.

This was the #8 push-lok rubber hose from a barbed elbow on the tank to a barbed FJIC to mate with the water separator inlet adapter.