Hey guys,
Thanks for the replies and suggestions.
The noise just started a few days ago. A few weeks ago I installed the engine after a winter head gasket project, although I can't see how there could be any connection to that. I think I would agree that it is most likely debris in the fuel tank as the tank is the original.
I'm going to try shooting some air back through the line and then see if there is a change to the noise. I've ordered a new fuel pump just in case, as the pump is the original as far as I can tell and I probably will be adding a new tank in the near future.
Thanks to you all,
Bob Anderson
'86 Vanagon
Wilmington,MA