Why do I have to tap the fuel pump?

[Rich Peterson <kerry3@earthlink.net>]

Hi folks,

I have a '78 'B with a fuel pump which appears to be dying a slow
death.  I cleaned the points, but I still have to give it a tap to get
it working when starting the car after a day or two.  What is it that is
being jarred loose when I tap?  Any way to fix it?  Inquiring minds want
to know . . .

Cheers,

Rich P.