[T3] Car Cures Itself...
Bobsnotch at aol.com
Bobsnotch at aol.com
Fri Jun 28 07:30:22 PDT 2013
In a message dated 6/28/2013 8:18:08 A.M. Eastern Daylight Time,
dave at hallvw.clara.co.uk writes:
One of our UK club members investigated this carefully on his Type 3, and
found that there can be 'micro-leaks' in the piping that don't leak fuel
but
do allow air into the pipes over a time. He replaced hoses and the
pressure
fall-off was greatly reduced. I assume his fuel-pump non-return system was
still functioning OK.
I've seen figures for the ring main pressure fall-off in a VW manual and
seem to recall a figure of around 10psi even after a number of hours.
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.
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). ;-)
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).
Bob 65 Notch S w/Sunroof and IRS aka Krusty
64 T-34 Ghia aka Wolfie
71 Square-vert under construction
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