[Rhodes22-list] Bonnie Fuel Pump Problems

[Michael D. Weisner]

Hank and Brad,

The situation the you refer to is found in a carb (normally aspirated)
equipped engine fuel bowl fill problem.  Either the float level is set too
low or the bad pump doesn't have enough pressure to open the inlet valve.  A
12 pound output (if the gauge is correct) should be plenty of pressure to do
the job.

I still think that the problem is related to the line going to the pump.  If
the line is kinked, the pump may have difficulty drawing enough fuel through
the high resistance of the line when at low RPM (reduced output).  This is
akin to trying to breath through a narrow hose compared to a large bore hose
when under water.  It is much harder to suck through the narrow tubing.  The
electric pump, which I presume is located near the tank, pushes the fuel
through the line at full (30 PSI?) pressure, regardless of engine speed.

Is the problem related to both (or several) tanks?  If it is, the problem
may be in the tank selector.

Mike


From: "Hank" <hnw555 at gmail.com>
Sent: Wednesday, November 08, 2006 12:31 PM


> Brad,
>
> A slow drip, say 1 drop every 5-10 seconds, is normal even when the boat
is
> not running.  The only way to eliminate drips completely is to install a
> dripless shaft seal.
>
> IRT, your toy, it makes me think of the old joke, Doctor it hurts when I
> cough.  So don't Cough!  So don't bring the idle down below 1000!  Easy
fix,
> next problem?
>
> Seriously, I used to have a similar problem on a Chevy Truck, except in
> reverse.  At idle and slow speeds the engine ran fine, but at highway
speeds
> the engine would sputter.  The pump was in failing mode and supplied a
> reduced amount of fuel, which was fine at lower speeds, but not sufficient
> at highway speeds.
>
> Here is an idea.  In a regular carburetor, the pump sends fuel up to a
> supply chamber in teh carburetor that is there to react to immediate
changes
> in throttle settings.  It sounds like your pump quits working below 1000
rpm
> and the engine dies once the feed chamber has been emptied.
>
> Hank
>
> On 11/8/06, Brad Haslett <flybrad at gmail.com> wrote:
> >
> > Hank & Rummy,
> >
> > The issue is that the dripping continues when the engine is shut off.
In
> > fact, it was dripping when I arrived at the boat after not having been
run
> > for a week.  It has always dripped some while running, as it is supposed
> > to,
> > but never that much.  What causes it to drip stationary?
> >
> > While you're solving that problem, I just got back from the airport to
fly
> > my airplane.  The new engine driven pump works fine at full power all
the
> > way down to idle at 1000 rpm.  However, comma, when you pull the idle
back
> > to 700, where it is correctly set, the fuel pressure off the engine pump
> > stabilizes at 12 pounds, which is fine, then after 30 seconds suddenly
> > goes
> > to zero and the engine quits.  If you can flip on the electric pump fast
> > enough it comes back to life.  The mystery continues.
> >
> > Don't you just love toys!
> >
> > Brad
> >
> >
> > On 11/8/06, Hank < hnw555 at gmail.com> wrote:
> > >
> > > Brad,
> > >
> > > All standard stuffing boxes should drip some.  It is required to keep
it
> > > lubricated and cooled.  My Islander 36 always had some water in the
> > bilge
> > > and that is normal for a lot of boats.  I didn't worry about it
freezing
> > > as
> > > it was not "enclosed" such as inside a pipe or engine block and
couldn't
> > > rupture anything.
> > >
> > > That being said, if you find that you do have stuffing box issues, I
> > > highly
> > > recommend changing to a dripless system.  After, I switched mine, I
> > never
> > > had any water coming in from there.  Check out
> > > http://www.shaftseal.com/index.html
> > >
> > > Hank
> > >
> > > On 11/8/06, Brad Haslett <flybrad at gmail.com> wrote:
> > > >
> > > > Hank,
> > > >
> > > > Good question.  I'm thinking the water is getting by the stuffing
box
> > > and
> > > > finding the next weakest link.  The sequence is transmission - brass
> > > > coupling - rubber enclosed shaft? - and I think the stuffing box.
To
> > be
> > > > honest, I didn't have time to troubleshoot the problem.  The steady
> > drip
> > > > is
> > > > coming from the brass coupling just downstream from the tranny.  It
> > has
> > > > two
> > > > fittings that tighten against each other but I didn't have the tools
> > to
> > > > try
> > > > it. The water accumulates to the top of the bilge and then vents
> > > > overboard.
> > > > I'll need to fix or haul before the first good freeze.  I keep a
> > heater
> > > on
> > > > at 40 degrees when I'm gone during the winter but yesterday the
> > > > electricity
> > > > at the docks was off.
> > > >
> > > > Any more ideas?
> > > >
> > > > Brad
> > > >
> > > >
> > > > On 11/8/06, Hank <hnw555 at gmail.com> wrote:
> > > > >
> > > > > Brad,
> > > > >
> > > > > How could the drive shaft be dripping where it connects to the
> > > > > transmission?  Where is the water coming in from?  I started to
> > think
> > > > the
> > > > > stuffing box, but it should be lower than the tranmission
coupling,
> > so
> > > > > that
> > > > > shouldn't be a possibility.  Is the water coming in from above the
> > > > engine
> > > > > and then just collecting and dripping off of the shaft?
> > > > >
> > > > > Just some ideas.
> > > > >
> > > > > Hank
> > > > >
> > > > > On 11/8/06, Brad Haslett < flybrad at gmail.com> wrote:
> > > > > >
> > > > > > Finally,  some good news to brighten-up a difficult yesterday.
We
> > > > > closed
> > > > > > on
> > > > > > the sale of our shop building near the lake and sold our tractor
> > we
> > > > used
> > > > > > to
> > > > > > bushog the place as well. The buyer for the tractor kept me
> > waiting
> > > > over
> > > > > > four hours and then did some last minute haggling over a
> > previously
> > > > > agreed
> > > > > > upon price.  Forunately for him I came unarmed. The bad news is
> > that
> > > > my
> > > > > > boat
> > > > > > had water in the bilge for the first time ever.  The drive shaft
> > is
> > > > > > steadily
> > > > > > dripping where it connects to the transmission.  This may be a
> > > result
> > > > of
> > > > > > the
> > > > > > grounding last year.  Anyway, the repair will probably require
it
> > to
> > > > be
> > > > > > hauled, which  is a good idea anyway to inspect for damage.
I've
> > > been
> > > > > > operating on the theory of "what you don't know can't hurt you"
> > but
> > > > that
> > > > > > game has been played long enough.
> > > > > >
> > > > > > The DC-10 is going away in the next couple of years and I have
to
> > > make
> > > > > the
> > > > > > leap into the digital age one way or the other.  I have been
> > > > predicting
> > > > > > this
> > > > > > event all along and damned if I wasn't right.  Here is something
> > to
> > > > look
> > > > > > forward to.
> > > > > >
> > > > > > Brad
> > > > > >
> > > > > > --------------------------
> > > > > >
> > > > > > *Company Cancels A380 Order *
> > > > > >
> > > > > > MEMPHIS, Tenn.--(BUSINESS WIRE)--FedEx Express, a unit of FedEx
> > > Corp.
> > > > > > (NYSE:
> > > > > > FDX), announced today an agreement with The Boeing Company
(NYSE:
> > > BA)
> > > > to
> > > > > > acquire 15 new Boeing 777 Freighter aircraft with options to
> > > purchase
> > > > an
> > > > > > additional 15 aircraft. The decision to purchase the 777F was
made
> >
> > > > after
> > > > > > Airbus announced significant delays in delivery of the A380.
FedEx
> > > > > Express
> > > > > > notified Airbus that it has cancelled its order for 10
A380-800Fs.
> >
> > > > > >
> > > > > > "Global demand for air cargo and express services continues to
> > grow
> > > > > > rapidly
> > > > > > and FedEx has made significant investments in our network to
meet
> > > > > > customers'needs and fulfill our business objectives. Therefore,
it
> > > was
> > > > > > necessary and
> > > > > > prudent for us to acquire the Boeing 777 Freighter." said
> > Frederick
> > > W.
> > > > > > Smith, chairman, president and chief executive officer, FedEx
> > Corp.
> > > > "The
> > > > > > availability and delivery timing of this aircraft, coupled with
> > its
> > > > > > attractive payload range and economics, make this choice the
best
> > > > > decision
> > > > > > for FedEx, its customers, shareowners and employees."
> > > > > >
> > > > > > FedEx Express continues to be Airbus' largest wide-body airplane
> > > > > customer
> > > > > > and will add additional new and used Airbus wide-body aircraft
to
> > > its
> > > > > > fleet
> > > > > > in coming years. Six new A300-600 aircraft are scheduled to join
> > the
> > > > > FedEx
> > > > > > fleet in 2007.
> > > > > >
> > > > > > *Boeing 777*
> > > > > >
> > > > > > The Boeing 777 Freighter is the world's largest twin-engine
cargo
> > > > > aircraft
> > > > > > with a range of more than 6,100 nautical miles and a revenue
> > payload
> > > > > > capacity of 171,000 pounds. This represents a 2,200 nautical
mile
> > > > > increase
> > > > > > in range and an additional 8,500 pounds of revenue payload over
> > the
> > > > > > MD-11F,
> > > > > > which is FedEx's primary long-haul aircraft. These advantages
will
> > > > > result
> > > > > > in
> > > > > > more non-stop, point-to-point transoceanic routes with shorter
> > > flight
> > > > > > times,
> > > > > > enabling improved service offerings to FedEx customers. FedEx
> > > Express
> > > > is
> > > > > > expected to take delivery of four of the 777 aircraft in
calendar
> > > year
> > > > > > 2009,
> > > > > > eight in 2010 and the remaining three in 2011.
> > > > > >
> > > > > > "The Boeing 777F will allow FedEx Express to fly directly
between
> > > > major
> > > > > > markets and hubs in Asia, Europe and the U.S. with more freight
> > and
> > > in
> > > > > > less
> > > > > > time than it takes today, improving fuel efficiency and lowering
> > > total
> > > > > > operating costs," said David J. Bronczek, president and chief
> > > > executive
> > > > > > officer, FedEx Express.
> > > > > > __________________________________________________
> > > > > > Use Rhodes22-list at rhodes22.org , Help? www.rhodes22.org/list
> > > > > >
> > > > > __________________________________________________
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> > > > __________________________________________________
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> > > __________________________________________________
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> > >
> > __________________________________________________
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> >
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