Right of course. I recall mention of "residual pressure" checks in various
VW Bentley manuals.

Thanks for that.

I guess the best one can do (as Jeff did) is bump the pump to get debris
out. Or would there be any benefit to some how flushing the inlet of pump
with a suitable cleaner then letting all drain out inlet?

Neil.

On Sat, Jun 9, 2012 at 12:29 PM, David Beierl <dbeierl@attglobal.net> wrote:

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
>

--
Neil n

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