Hi Steve --
At 02:27 PM 8/1/2001, Steve Sandlin wrote:
>I was working on my '84 this weekend, and checked fuel pressure.  It was
>correct, both with the regulator connected and disconnected.  In comparing
>with another '84, however, I found that my fuel pressure leaked down
>almost instantaneously after shutoff.

So either the regulator is leaking forward, or the pump is leaking
backwards.  Since you have another one nearby, swap out the regulator.  If
the problem stays it's the pump; if it goes it's the regulator.

d
ps -- the O2 sensor can get poisoned by antiseize, by acetic-acid-curing
RTV, prolly lots of other things.

>   The other van held fuel pressure at the test "T".  I checked for leaky
> injectors and found all ok in that department.  Also looked for fuel line
> leaks and found none.  Is there a check valve in the fuel pump that is
> not working correctly, or is there a check valve somewhere else in the
> system that I haven't found?  If anyone's curious, the reason for the
> work was tha gas mileage had decreased to 10.1, immediately after
> installation of new transmission.  I was trying to find if the shop had
> done something incorrect.  Problem was O2 sensor failure, though this
> sensor was replaced last year and only had about 6K miles on it.  Thanks
> in advance, everyone.
>Steve Sandlin

David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"