On Thu, 30 Mar 2006 08:54:32 -0600, "West Indies"
wrote:

I took apart the couplings for the water and fuel filter units. I
reinstalled everything using Teflon tape on all threads. My problem went
away.

Unfortunately teflon tape has a reputation for degrading over time
when in contact with diesel fuel. Professional mechanics use a
special blue paste to seal fuel fittings.