At 02:04 PM 6/9/2012, neil n wrote:
>So for future reference, if one wanted to flush away debris from filter
>inside the fuel pump, would a gravity feed only (NO electricity) to the
>outlet of pump suffice?

No.  That pump maintains ~40 psi in the fuel system when it's not
running.  I thought that was done by a check valve (which would
prevent back-flushing) - I'm surprised to learn that the pump
clearances are tight enough to maintain system pressure for half an
hour with gasoline.  But even if they weren't that tight, a roller
pump like that won't pass any appreciable amount in either direction
under gravity alone.

Yours,
David