Would that be related to the Water/Fuel Separator configuration? If so, its all metal.
Note: when I was checking out after submitting my inititial question, I was unable to provide an email address to repsond to. If you can send a notice to an email that you've responded or have additional questions, please send to XXXXX@XXXXXX.XXX. Thanks.
Additional question: on the 1990 7.3L diesel, just curious if the lift pump is the same thing as the injector pump? Thanks.
Removed the fuel filter. It was not full.
Thanks for your help. I know we haven't troubleshot this completely, but I'd like to accept your answer and be done. I'm afraid I won't have to do this additional test until the coming weekend and don't want to prolong you not getting paid for your help. Thanks again.