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<DIV>In a message dated 6/28/2013 8:18:08 A.M. Eastern Daylight Time,
dave@hallvw.clara.co.uk writes:</DIV>
<DIV>
<BLOCKQUOTE style="PADDING-LEFT: 10px; MARGIN-LEFT: 10px">
<DIV><FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=2
face=Arial>One of our UK club members investigated this carefully on his Type
3, and<BR>found that there can be 'micro-leaks' in the piping that don't leak
fuel but<BR>do allow air into the pipes over a time. He replaced hoses
and the pressure<BR>fall-off was greatly reduced. I assume his fuel-pump
non-return system was<BR>still functioning OK. <BR><BR>I've seen figures
for the ring main pressure fall-off in a VW manual and<BR>seem to recall a
figure of around 10psi even after a number of hours.</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>On my old 71 Notch, I replaced the "in the tunnel" fuel lines, and found
that after pressurizing the system, it would hold 29 psi for hours (sometimes
all day) before dropping off. My wife's 70 Fastback however, would start
dropping pressure after a 1/2 hour, then steadily fall off during the day.
Note, both cars were using an aftermarket E2000 fuel pump (for an 85 ford
ranger) that Russ had recommended. </DIV>
<DIV>This may be a case of as the lines age, the "micro-leaks" expand, causing
the fall off. I haven't tried it on any other FI type 3s, but I've found that
my Geo is happier with it's new fuel lines (they were replaced due to rust).
;-)</DIV>
<DIV> </DIV>
<DIV>Yes, I've read that too. I think it's in either the "K" manual, or
the Elfrink fuel injection manual (maybe both, since they're so similar).
As I recall, both listed a 10 to 15 psi fall off in the first 1/2 hour,
then a slower drop off rate thereafter (part of the hydraulic test in Elfrink
calls out the drop to 15 psi).
<DIV> </DIV>
<DIV><FONT lang=0 size=2 face=Arial FAMILY="SANSSERIF" PTSIZE="10">Bob 65
Notch S w/Sunroof and IRS aka Krusty<BR>64 T-34 Ghia aka Wolfie<BR>71
Square-vert under
construction</FONT></DIV></DIV></BLOCKQUOTE></DIV></FONT></BODY></HTML>