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From: Bob Lowe (no email)
Date: Sun Jan 02 2005 - 12:50:49 EST
The fuel system before (tank side) the fuel lift pump will typically be
vacuum (unless you have an electric boost pump running) and the side between
the fuel lift pump and injector pump will be pressurized. The job of the
lift pump is to provide fuel to the injector pump, generally through the
secondary engine-mounted fuel filter. In this case, the place to mount the
vacuum gauge is between the primary fuel filters and the lift pump. That's
the way it looks from here.
Bob Lowe
<http://www.mv-dreamer.com/> www.mv-dreamer.com
******************************
Cummins Owners: Just a note to let you know that my idea about putting
vacuum
gauges on the engine between the engines lift pump and the engine mounted
fuel filter was a bad one. I lost the port vacuum gauge first after 9+
hours. The
Starboard went after 18+ hours. We only lost one gallon of fuel into the
engine hold each time, both spills were contained 100%. I suspect what
happened
was that when backing down, the Boshe Fuel pump offloads and sends pressure
back
into the incoming fuel line. This destroys the bellows inside of the gauge
and the fuel pours out.
>From reading literature from Flowscan, they recommend "Fuel pulsation
dampers
be installed in some installations" I have a feeling this is one of them.
So, don't do what I did. I was trying to get a differential pressure across
the racor filter, and by doing so was trying to determine which of the fuel
filters were plugging up. It sounded good, but just didn't work. But, if I
would
have installed shut off valves..... Maybe next year.
(Cummins Replies) Information for you on your fuel filter gauge....The lift
pump actually puts a slight positive pressure on the system so you should
not
put a vacuum gauge in a pressurized system or you will get failures as you
described. Racor and Fleetguard both make vacuum gauges that I would install
on/around the Racor filtration system that I think you have on the bulkhead
of your
46 Maxum. I would not mount it next to the lift pump as it might see spikes
from the pumping action of the lift pump giving you an artificially high
reading. The fuel line from the pump to the Racor system will act as a
buffer to
minimize the pumping action. Almost all of the time the (30 micron) Racors
will
plug long before the (2 micron) engine mounted fuel filter, so it is more
important to know when to change the Racor filters than the engine mounted
one.
Regards,
Capt. James Clausen, MV Summer School
Orlando, Fl 32819
"At sea a fellow comes out.
Salt water is like wine, in that respect."
- Herman Melville
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