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That return line is the dump back to the tank. It is also used by the
Primary Pressure Regulator to return unused, excess fuel back to the
tank too. The problem with using that dump line is that it is not
visually obvious the fuel accumulator is bad. Not using the dump back
to the tank is not safe because you would be dumping raw fuel out of
the car.The tank is under slight pressure, not much. Where else would
you put the fuel?
David Teitelbaum
vin 10757

--- In dmcnews@xxxxxxxxxxxxxxx, mike clemens <rmclemns@...> wrote:
> Okay, I agree you a 100% on what you said concerning the extra hose
(small end of the accumulator).  I found a Bosch web site and found
that the small end is actually supposed to be vented to the
atmosphere, not attached to a return fuel line.  To be sure, I cut one
of the bad ones I had in half.  To actually see what was inside was
very interesting.  (pictures available for anyone who wants to see the
> Now, this raises another question:  If the small end is supposed to
be vented to the atmosphere, are we not damaging the bladder inside
the accumulator by having fuel present on both sides (the return line
from the engine is just a simple "T" fitting and it is attached
directly to the small end, with no way to block off unwanted fuel).
> I fully understand that if the bladder fails, you don't want to pee
fuel all over the underside of the car, but shouldn't that excess fuel
go somewhere besides an open fuel line, which is connected to a
semi-pressurized fuel tank??
> Mike   TPS   1630


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