Thanks for replying Thomas. The part is NOT a check valve -- it's hollow.
It's my understanding that the check valve is built into the electric pump.
Perhaps you didn't see my response to Tom's reply.
By the way, my previous posts were only on USENET: rec.autos.tech,
alt.autos.ford via google groups. I don't understand how they get copied
into this forum. I found this reply quite by accident and had to register
to respond to it. In fact, my response to Tom's reply that is shown here
doesn't appear on google groups yet!