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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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 Posted: Wed Apr 02, 2008 6:01 pm Post subject: Fuel pump mounting |
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I was wondering where people mount their fuel pump. The Ultrastar manual
says to mount it between the front engine mounting bolts, which seems a
little awkward (and would require a rather long pulse tube). The Cuyuna
manual says NOT to mount it directly to the engine (presumably to protect
it from vibration), and to mount it above the pulse line connection to the
crankcase (to avoid fuel collecting in the pump and/or pulse line).
On mine, the pump was mounted (by a previous owner) to a plate bolted to
the side of the engine, and the pulse line runs (slightly) downhill to the
pump. It's not the Rotax pump with the weep hole, though I suppose I could
drill one. Double whammy I guess, but it works fine (so far), and I've
seen no evidence of fuel or oil collecting there. Still, I'm making some
changes tomorrow (adding a plunger primer and getting rid of the squeeze
bulb), so I'm wondering if I should move the pump while I'm at it, and
wondering where others have mounted it (and any associated problems).
-Dana
--
Lie ? Me ? Never! No, no, no, the truth is far too much fun!
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aoldman(at)xtra.co.nz
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| Posted: Thu Apr 03, 2008 12:04 am Post subject: Fuel pump mounting |
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Well just my opinion but I would not remove rthe squeeze bulb. I have always
made a point of locating the squeeze bulb where it can be reached .It is
after all a fuel pump that is neither mechanical nor electric .In the last
400 hrs of flying there has been at least one time that it has saved me a
long walk home,If you can reach it ,it is another string to your bow if
needed. There are some rules to pumping them .THEY WORK BETTER WHEN HELD
VERTICAL.
Tony
Downunder
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Thu Apr 03, 2008 2:51 am Post subject: Fuel pump mounting |
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At 04:01 AM 4/3/2008, Tony Oldman wrote:
| Quote: | Well just my opinion but I would not remove rthe squeeze bulb. I have
always made a point of locating the squeeze bulb where it can be reached
.It is after all a fuel pump that is neither mechanical nor electric .In
the last 400 hrs of flying there has been at least one time that it has
saved me a long walk home...
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I thought of that, but OTOH it's another point for failure... and a bad
bulb (a brand new one from ACS for that matter) nearly CAUSED me a long
walk home. As squeeze bulb failures seem to be more common than pulse pump
failures, removal of the bulb should be a safety improvement.
-Dana
--
The family that shoots together..... shouldn't be messed with!
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ElleryWeld(at)aol.com
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| Posted: Thu Apr 03, 2008 3:39 am Post subject: Fuel pump mounting |
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another opinion of the squeeze bulb they are very poor quality and I have heard many stories and had the one fail on my first plane Great rig for in a Boat , nothing I would install in anything I fly if I want redundant I would install mechanical or Vacum pump and Electric pump for back up I don't want to have to give up a hand that I might need for flying the plane to give my plane in Flight CPR
Ellery in Maine
do not archive
In a message dated 4/3/2008 3:05:34 A.M. Eastern Standard Time, aoldman(at)xtra.co.nz writes:
[quote]--> Kolb-List message posted by: "Tony Oldman" <aoldman(at)xtra.co.nz>
Well just my opinion but I would not remove rthe squeeze bulb. I have always
made a point of locating the squeeze bulb where it can be reached .It is
after all a fuel pump that is neither mechanical nor electric .In the last
400 hrs of flying there has been at least one time that it has saved me a
long walk home,If you can reach it ,it is another string to your bow if
needed. There are some rules to pumping them .THEY WORK BETTER WHEN HELD
VERTICAL.
Tony
Downunder
---
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jb92563
Joined: 23 Mar 2007
Posts: 314
Location: Southern California
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| Posted: Thu Apr 03, 2008 6:52 am Post subject: Re: Fuel pump mounting |
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My Mikunni fuel pump is mounted on one of the square tubes of the engine support just above the impulse nipple.
There was already a hole there so thats where I put it.
I had also considered an aircraft dash plunger primer, since I have one sitting around, but decided against it since it is yet another potential failure point in the fuel system.(obstruction & potential air leak)
If you must have one, it is much better than a squeeze bulb at least.
If you are using it to squirt some extra fuel in the carb for starting it would be better to use the carb nipple to a seperate fuel line to squirt extra fuel.
If it is to prime your fuel line then perhaps there is already an air leak that is allowing fuel to drain back into your tank?
Right now my fuel line run is about 24" with a fuel filter bowl type at the low point and a pump at the hight point in the circuit and use tygon (expensive) fuel tubing. I think my fuel system is optimized at this point.
With my fuel line arrangement the lines stay primed with fuel even when I leave it sit for a couple months.
My start procedure is to pull choke with ignition OFF and pull start 2 times then Ign ON and one or two pulls and its off and running.
On another note, last evening I got the 2 new CHT guages hooked up to the Instrument properly...still need to test to make sure my readings are good now.
Then I'll play with main jets to get the temps in line.
I have some bigger and smaller main jets on the way #270, #280, #290, #300 & #310 and a different needle 6DH7 in case I feel like experimenting. Also have a K&N air filter on the way.
Good work on that rudder pedal mod, I'll have to keep that one in mind for future reference.
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_________________
Ray
Kolb UltraStar (Cuyuna UL-202)
Moni MotorGlider
Schreder HP-11 Glider
Grob 109 Motorglider
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aoldman(at)xtra.co.nz
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| Posted: Thu Apr 03, 2008 3:47 pm Post subject: Fuel pump mounting |
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I have the squeeze bulb installed with a bypass incase it fails {this I believe to be the recomended instalation for these}
Tony
Downunder
[quote] ---
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Thu Apr 03, 2008 5:34 pm Post subject: Fuel pump mounting |
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At 07:44 PM 4/3/2008, Tony Oldman wrote:
| Quote: | | I have the squeeze bulb installed with a bypass incase it fails {this I believe to be the recomended instalation for these} |
A bypass protects against a blocked bulb, but not against a leaking bulb.
-Dana
--
War doesn't determine who's right but who's left. [quote][b]
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ElleryWeld(at)aol.com
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| Posted: Thu Apr 03, 2008 6:08 pm Post subject: Fuel pump mounting |
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ok now what are you going to do when the squeeze bulb falls apart while trying to give your engine in flight CPR ? your bypass line wont be worth much then ha, then if you happen to have a spare one aboard scramble around the cockpit for it, meanwhile (Don't forget to keep flying the plane ) and that one falls apart trying to install it in flight, no thanks there just not good enough quality for me but good luck using them if you must
Ellery
do not archive
In a message dated 4/3/2008 6:48:27 P.M. Eastern Standard Time, aoldman(at)xtra.co.nz writes:
[quote] I have the squeeze bulb installed with a bypass incase it fails {this I believe to be the recomended instalation for these}
Tony
Downunder
[quote] ---
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aoldman(at)xtra.co.nz
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| Posted: Fri Apr 04, 2008 12:40 am Post subject: Fuel pump mounting |
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Very true ,so I guess like many things in life, sometimes it will work for you and sometimes it will work against you.
Tony
Downunder
[quote] From: Dana Hague (d-m-hague(at)comcast.net)
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
Sent: Friday, April 04, 2008 2:22 PM
Subject: Re: Fuel pump mounting
At 07:44 PM 4/3/2008, Tony Oldman wrote:
| Quote: | | I have the squeeze bulb installed with a bypass incase it fails {this I believe to be the recomended instalation for these} |
A bypass protects against a blocked bulb, but not against a leaking bulb.
-Dana
--
War doesn't determine who's right but who's left. | Quote: |
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[b]
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