1985 300TD - Fuel Boost Pump Problem?

A couple of years ago I installed the fuel boost pump sold on this site (DSE-COMAEBP) and the optional filter. Can failure of this pump result in fuel supply problems?

I ask because yesterday I developed the classic symptoms of a fuel supply problem: the car will start but runs rough and eventually stalls. I checked the boost pump filter, changed the main fuel filter and bled the air from the system, No change. I then ran diesel purge through the injectors and re-bled the air. No change.

I then noticed that the fuel booster pump did not seem to be clicking on. I disconnected the fuel inlet at the hard line and turned on the ignition - no fuel appeared. This implies to me that the boost pump is not working. If this unit doesn't work does it create a constriction in the fuel line that could lead to fuel starvation?

Thanks

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