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Thread: Fuel Sending Unit ? - 77 Sierra MC-460

  1. #1

    Fuel Sending Unit ? - 77 Sierra MC-460

    When I start cold (Ottawa, ON is very cold) the engine will not idle below about 1300-1400 RPM without stalling. We have a Tannis Heater and an engine cover on the plane and never attempt a start unless the engine oil temp on the UBG is at least 40 degrees or better. Usually fires up just fine and runs great once the temps are in the 90's (by the time you get to do the run up, I will not take off unless the oil temp is 100 or better, just a personal guess). During the time between 40 and 90 if you pull the power below 1300 RPM the engine will quit. Almost seems like it is not getting fuel even with the mixture full rich. I also tried yesterday with the mixture leaned a bit to prevent the plugs from being fouled and to help warm the engine a bit faster but same problem. Open the throttle a bit further and it restarts fine. Any other IO-360 drivers had this problem? My mechanic says that this is not normal for a fuel injected engine and suspects it may be related to the Fuel Sending unit or something with the throttle body.

    Bruce

    C-GMTT


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  2. #2
    STEPHEN.H.ROBERTSON at sa
    Guest

    Fuel Sending Unit ? - 77 Sierra MC-460

    Bruce,

    I don't preheat my IO-360 unless the outside temperature is 25 F or below.
    My plane is tied down outside. I use Phillips 20W-50 oil. Before starting, I
    move throttle full open, mixture full rich. Then I hit the boost pump for
    2-3 seconds. Then I close the throttle to a setting that will normally give
    me about 1000 rpm idle. It will usually start within 10-15 seconds of
    cranking. Once started, I have no trouble maintaining 1000 RPM. I'm sure it
    would idle slower when cold, but I don't operate it that way. After a few
    seconds of running, I lean aggressively and keep it that way until runup.

    Best regards,

    Steve Robertson
    N4732J 1967 Super III

    -----Original Message-----
    From: bac-mail-bounces@beechaeroclub.org
    [mailto:bac-mail-bounces@beechaeroclub.org]
    Sent: Monday, January 23, 2006 11:34 AM
    To: musketeermail@yahoogroups.com; bac-mail@beechaeroclub.org
    Subject: [BAC-Mail] Fuel Sending Unit ? - 77 Sierra MC-460


    When I start cold (Ottawa, ON is very cold) the engine will not idle below
    about 1300-1400 RPM without stalling. We have a Tannis Heater and an engine
    cover on the plane and never attempt a start unless the engine oil temp on
    the UBG is at least 40 degrees or better. Usually fires up just fine and
    runs great once the temps are in the 90's (by the time you get to do the run
    up, I will not take off unless the oil temp is 100 or better, just a
    personal guess). During the time between 40 and 90 if you pull the power
    below 1300 RPM the engine will quit. Almost seems like it is not getting
    fuel even with the mixture full rich. I also tried yesterday with the
    mixture leaned a bit to prevent the plugs from being fouled and to help warm
    the engine a bit faster but same problem. Open the throttle a bit further
    and it restarts fine. Any other IO-360 drivers had this problem? My mechanic
    says that this is not normal for a fuel injected engine and suspects it may
    be related to the Fuel Sending unit or something with the throttle body.

    Bruce

    C-GMTT


    IMPORTANT NOTICE: This message is intended only for the use of the
    individual or entity to which it is addressed. The message may contain
    information that is privileged, confidential and exempt from disclosure
    under applicable law. If the reader of this message is not the intended
    recipient, or the employee or agent responsible for delivering the message
    to the intended recipient, you are notified that any dissemination,
    distribution or copying of this communication is strictly prohibited. If
    you have received this communication in error, please notify Gowlings
    immediately by email at postmaster@gowlings.com. Thank you.

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  3. #3

    Fuel Sending Unit ? - 77 Sierra MC-460

    Steve,

    Why do you open the throttle when you prime?

    Dan Kirby
    Sierra N9299S

    --- "Robertson, Steve (Stephen H)"
    <STEPHEN.H.ROBERTSON@saic.com> wrote:

    > Bruce,
    >
    > I don't preheat my IO-360 unless the outside
    > temperature is 25 F or below.
    > My plane is tied down outside. I use Phillips 20W-50
    > oil. Before starting, I
    > move throttle full open, mixture full rich. Then I
    > hit the boost pump for
    > 2-3 seconds. Then I close the throttle to a setting
    > that will normally give
    > me about 1000 rpm idle. It will usually start within
    > 10-15 seconds of
    > cranking. Once started, I have no trouble
    > maintaining 1000 RPM. I'm sure it
    > would idle slower when cold, but I don't operate it
    > that way. After a few
    > seconds of running, I lean aggressively and keep it
    > that way until runup.
    >
    > Best regards,
    >
    > Steve Robertson
    > N4732J 1967 Super III
    >
    > -----Original Message-----
    > From: bac-mail-bounces@beechaeroclub.org
    > [mailto:bac-mail-bounces@beechaeroclub.org]
    > Sent: Monday, January 23, 2006 11:34 AM
    > To: musketeermail@yahoogroups.com;
    > bac-mail@beechaeroclub.org
    > Subject: [BAC-Mail] Fuel Sending Unit ? - 77 Sierra
    > MC-460
    >
    >
    > When I start cold (Ottawa, ON is very cold) the
    > engine will not idle below
    > about 1300-1400 RPM without stalling. We have a
    > Tannis Heater and an engine
    > cover on the plane and never attempt a start unless
    > the engine oil temp on
    > the UBG is at least 40 degrees or better. Usually
    > fires up just fine and
    > runs great once the temps are in the 90's (by the
    > time you get to do the run
    > up, I will not take off unless the oil temp is 100
    > or better, just a
    > personal guess). During the time between 40 and 90
    > if you pull the power
    > below 1300 RPM the engine will quit. Almost seems
    > like it is not getting
    > fuel even with the mixture full rich. I also tried
    > yesterday with the
    > mixture leaned a bit to prevent the plugs from being
    > fouled and to help warm
    > the engine a bit faster but same problem. Open the
    > throttle a bit further
    > and it restarts fine. Any other IO-360 drivers had
    > this problem? My mechanic
    > says that this is not normal for a fuel injected
    > engine and suspects it may
    > be related to the Fuel Sending unit or something
    > with the throttle body.
    >
    > Bruce
    >
    > C-GMTT
    >
    >
    > IMPORTANT NOTICE: This message is intended only for
    > the use of the
    > individual or entity to which it is addressed. The
    > message may contain
    > information that is privileged, confidential and
    > exempt from disclosure
    > under applicable law. If the reader of this message
    > is not the intended
    > recipient, or the employee or agent responsible for
    > delivering the message
    > to the intended recipient, you are notified that any
    > dissemination,
    > distribution or copying of this communication is
    > strictly prohibited. If
    > you have received this communication in error,
    > please notify Gowlings
    > immediately by email at postmaster@gowlings.com.
    > Thank you.
    >
    > _______________________________________________
    > BAC-Mail mailing list
    > BAC-Mail@beechaeroclub.org
    >
    http://www.beechaeroclub.org/mailman/listinfo/bac-mail
    > _______________________________________________
    > BAC-Mail mailing list
    > BAC-Mail@beechaeroclub.org
    >
    http://www.beechaeroclub.org/mailman/listinfo/bac-mail
    >


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