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andy_ringrose(at)onetel.c
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 Posted: Thu Aug 13, 2020 12:49 am Post subject: 912ULS Fuel pump pressure below limits |
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New pump fitted iaw Rotax 5 yearly recommendation 4 months ago and has
approx. 20 hours in service. A progressive reduction in pressure trend
observed during previous 6 hours operation reaching a minimum of 1.6PSI in
cruise on the last flight. Maximum pressure observed on ground test of 2.3
PSI. Fuel pump pressure indicator calibration tested OK. Awaiting response
from ROTAX UK. Is this an isolated occurrence?
Andy
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dashwoodlock(at)yahoo.ca
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| Posted: Thu Aug 13, 2020 5:40 am Post subject: 912ULS Fuel pump pressure below limits |
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i had similar problem on one tank in a evektor..
the wet wing tank had been leaking and serviced the year before i got the plane.. they did not follow procedures and put too much sealant on the inspection hatch... and installed rivets before it tacked up.... the tank had ... hundreds of hair like strings ( too much silicon used) hanging from top to the bottom of tank....... through out the year these started to break off and compleatly plugged the fuel line from one end to the other.... up to the selector valve.... all parts were removed and cleaned and reinstalled.... ..
all we could do to the tank was borescope retractor as much of the silicon fibers as we could through the filler neck.... .. .best fix should have removed the 18 x 18" inspections hatch and resealed .. and repainted the wing...
On Thursday, August 13, 2020, 06:53:36 a.m. EDT, Andy Ringrose <andy_ringrose(at)onetel.com> wrote:
New pump fitted iaw Rotax 5 yearly recommendation 4 months ago and has
approx. 20 hours in service. A progressive reduction in pressure trend
observed during previous 6 hours operation reaching a minimum of 1.6PSI in
cruise on the last flight. Maximum pressure observed on ground test of 2.3
PSI. Fuel pump pressure indicator calibration tested OK. Awaiting response
from ROTAX UK. Is this an isolated occurrence?
Andy
--
This email has been checked for viruses by AVG.
https://www.avg.com
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RotaxEngines-List |
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Griffo
Joined: 18 Mar 2021
Posts: 70
Location: The Oaks, NSW, Australia
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| Posted: Sat May 08, 2021 9:20 pm Post subject: Re: 912ULS Fuel pump pressure below limits |
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Yeh! sounds like a restricted fuel flow which could be the filter, blocked tank breather or like Dashwwoodlock, blocked fuel line (particularly at tank exit point)
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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