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1. 02:35 AM - Re: [jabiruengines] fuel pressure with full throttle (James, Clive R)
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| Subject: | RE: [jabiruengines] fuel pressure with full throttle |
That does sound quite low, the sensor should be between the engine fuel
pump and the carby. 0.07mb is the square root of * all.
Though if you can carry out a 5 min climb at full throttle without the
electric pump then I would be happy.
The other check to perform is a fuel flow check, this is stipulated by
the UK LAA on an aircraft build and checks that your system has excess
fuel when it's at full throttle. It is a good check to carry out though
it is a bit of a fiddle to do.
See the form at
http://www.lightaircraftassociation.co.uk/engineering/StandardForms/LAA-I
C-FF%20Fuel%20Flow%20Check%20Results.pdf
And instructions at
http://www.lightaircraftassociation.co.uk/engineering/TechnicalLeaflets/O
perating%20An%20Aircraft/TL%202.20%20Fuel%20Flow%20Checking%20of%20Pumped
%20Systems.pdf
or follow the links on the left from the LAA website
Fuel flow form is at
http://www.lightaircraftassociation.co.uk then 'Forms/checklists' then
under inspection, Fuel Flow
<http://www.lightaircraftassociation.co.uk/engineering/StandardForms/LAA-
IC-FF%20Fuel%20Flow%20Check%20Results.pdf> (try clicking on this)
And the Tech leaflet, instructions for carrying out the checks is at
http://www.lightaircraftassociation.co.uk then 'technical leaflets' then
under operating an aircraft, TL 2.20
<http://www.lightaircraftassociation.co.uk/engineering/TechnicalLeaflets/
Operating%20An%20Aircraft/TL%202.20%20Fuel%20Flow%20Checking%20of%20Pumpe
d%20Systems.pdf> (try clicking on this)
Regards, Clive
From: jabiruengines@yahoogroups.com
[mailto:jabiruengines@yahoogroups.com] On Behalf Of jacques Bascou
Sent: 27 December 2011 17:50
Subject: Re: [jabiruengines] fuel pressure with full throttle
Thank's everyone...
I had another fly today (it's winter in french...), flying over 2 hours.
No problem of pressure. I just set the fuel pressure alarm at 0,07 mB.
I don't really understand why fuel pressure goes down with little T=B0,
and why when full throttle...
I'm positive, thinking I have a lot of things to learn...
Thank's for all responses...
Le 27 d=E9c. 2011 =E0 17:01, jimpuglise@comcast.net
<mailto:jimpuglise%40comcast.net> a =E9crit :
> I have had the same problem. It sometimes drops to < .75, which is the
limit in the manual. However, I have never seen any signs of fuel
starvation as a result of it. I e-mailed Pete about it and got a
response from him asking where my fuel pressure gauge was in the line,
so I assume that the placement of the sensor has some impact.
Additionally, the opening in the engine installed pump is only 1/4 inch,
so there is a little restriction built in.
>
> Jim Puglise
> Europa, Jab 3300
>
> ----- Original Message -----
> From: "Clive R James" <clive.james@uk.bp.com
<mailto:clive.james%40uk.bp.com> >
> To: jabiruengines@yahoogroups.com
<mailto:jabiruengines%40yahoogroups.com>
> Sent: Tuesday, December 27, 2011 6:00:39 AM
> Subject: RE: [jabiruengines] fuel pressure with full throttle
>
>
>
>
>
>
> Fuel pressure is a function of how much the fuel valve in the carby
> (assuming you have one) is open.
>
> So at full throttle the pressure built up by the pump against an
almost
> fully open float valve will be low.
>
> It is an normal thing, set your TV screen up so it gives an alarm at
> just below what the full flow reading is with only the engine pump.
>
> Go fly!
>
> Regards, Clive
>
> From: jabiruengines@yahoogroups.com
<mailto:jabiruengines%40yahoogroups.com>
> [mailto: jabiruengines@yahoogroups.com
<mailto:jabiruengines%40yahoogroups.com> ] On Behalf Of jacques Bascou
> Sent: 27 December 2011 09:48
> To: jabiruengines@yahoogroups.com
<mailto:jabiruengines%40yahoogroups.com>
> Subject: [jabiruengines] fuel pressure with full throttle
>
> Yesterday, I wanted to have a long fly. After taking off, I have gat a
> fuel pressure alarm.
>
> After some check, I decided to land.
> It looks that with full throttle, pressure goes down, and becomes good
> again after reduicing throttle. No problem when using electric pump. I
> never saw that because fuel pressure is not on principal screen on my
> dynon. I cancelled my fly with a big disppointement.
>
> Is it a normal thing, or does I have a problem with my fuel pump?
>
> Merry christmas to eveyone!!!
>
> [Non-text portions of this message have been removed]
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
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