Date:         Sat, 9 Jun 2012 15:29:31 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: 1985 1.9 Hesitation at higher RPM **SOLVED**
Comments: To: neil n <musomuso@GMAIL.COM>
In-Reply-To:  <CAB2Rwfg+SSPE06H3+k-b=KN00w8n=q=5sCNR-o50w1S7khHeyQ@mail.g
              mail.com>
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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