That is interesting because the electric pump which is now
used for priming is installed in series with the mechanical
lift pump. Never had any problem with things not working.
This setup was done by a reputable outfit and has been done
on hundreds of boat from what I understand.

Doug
s/v Callista

"Rich Hampel" wrote in message
...
The Walbro is a 'wobble plate' diaphragm and therefore not suitable for
series installation. If the wobble plate stops in a position such
that one pump is blocked then both pumps will not flow.

For parallel installation application - a simple thumb-cock on the
outlet of each pump would be sufficient.


In article , Kelton Joyner
wrote:

Unless you have isolation valves to allow servicing of a parallel pump,
series works just as well for backup.
fuel wil flow through the unpowered pump.
Kelton
W4IND
s/v Isle Escape

Larry W4CSC wrote:
(Steven Shelikoff) wrote in
:


That begs the question why are you going to put two pumps in parallel
if
you only want to run one at a time?

Steve



Backup?

Larry W4CSC