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1. 07:53 AM - Re: Rocket-List Digest: Fuel pressure & pumps... (pcondon)
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| Subject: | RE: Rocket-List Digest: Fuel pressure & pumps... |
--> Rocket-List message posted by: "pcondon" <pcondon@mitre.org>
At least the low pressure engine mounted pumps have one diaphragm and a one
way check valve. I have observed fuel in the oil when a diaphragm had a
split in it. I can see where -- if the electric aux fuel pump provided fuel
pressure up stream from itself (toward engine), there may possibly be
overpressuration and bleed off from the engine fuel pump. I thought there
were one way check valves to prevent this........
-----Original Message-----
From: owner-rocket-list-server@matronics.com
[mailto:owner-rocket-list-server@matronics.com] On Behalf Of Rocket-List
Digest Server
Subject: Rocket-List Digest: 1 Msgs - 03/28/04
*
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Total Messages Posted Sun 03/28/04: 1
Today's Message Index:
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1. 04:36 PM - IO-540 fuel pump ??? (Tom Gummo)
________________________________ Message 1
_____________________________________
Time: 04:36:49 PM PST US
From: "Tom Gummo" <T.gummo@verizon.net>
"Rocket List" <rocket-list@matronics.com>,
"RV List" <rv-list@matronics.com>
Subject: Rocket-List: IO-540 fuel pump ???
--> Rocket-List message posted by: "Tom Gummo" <T.gummo@verizon.net>
Fuel Pump questions?????
I have an IO-540 J4A5 version engine and it has the square fuel pump:
Lycoming part number - 74547
Description - Fuel Pump (RG-17980)
It has two small (AN-2) fittings, one on either side of the case and I was
told
they were drains or overflows of some type. So, I connected them to small
tubing
and ran them to the bottom of the cowl where they would drain away from the
exhaust.
1. Does anybody really know what they are?
When the engine is running, the engine fuel pump provides 25-30 psi
pressure.
The electric pump puts out 35 psi. With the engine off and the fuel system
pressurized
with the electric fuel pump, fuel comes out of one of them.
2. Is this normal?
I have been chasing a oil leak, one of my oil cooler lines, less than two
years
old, decided to give up and was replaced. So, I have been checking all the
little drops of oil on the floor after each flight to make sure that I fixed
the
problem. Yesterday, I found two drops of oil and it appears to have come
from
one of the engine mounted fuel pump drains.
3. Is this normal?
4. Is there is diaphragm with oil on one side and gas on the other
in this
type of pump?
I just want to make sure that the pump isn't showing signs of failure.
Thanks,
Tom Gummo
Apple Valley, CA
Harmon Rocket-II
do not archive
http://mysite.verizon.net/t.gummo/index.html
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