New fuel pump

by Roger Lee in 912 / 914 Technical Questions 12 years ago

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Re: New fuel pump

by Remi Guerner » 12 years ago

Remi Guerner

2 8 3

Thanks Roger for your answers, but this is disappointing.
Another info taken from my early July notes: a few flight hours after installation of the BCD pump, the fuel pressure went back to normal, with 5 psi at high idle. So it seems there is a sort of breaking-in of the pump. At this time I have only one and a half hour on the replacement pump. I will let you know what I get after a few more hours.
Remi

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Re: New fuel pump

by Roger Lee » 12 years ago

Roger Lee

126 5.13k 4.56k

I believe Rotax works hard at making things right, but unfortunately somethings from different Mfg's are not an exact science or has a 10 year proven history. I used to be a MFG once so I understand. So long as a company has my back and is willing to stand up and fix things then I'm good with that. yes sometimes it's inconvenient, but at least it isn't like the auto industry where it has to get so bad or enough people die that the auto Mfg's are forced to take action through legal and public outcry.
Rotax has always stepped up to the plate to help or make things right.
If you look at the big picture and take in everything there is a reason Rotax dominates the market and why they have grown in all markets that use their engines.

I don't like fixing things or spending money any more than the next guy.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: New fuel pump

by Glenn Kidd » 12 years ago

Glenn Kidd

0 2 0

Roger

First time using the forum.
My question is normal operating fuel pressure with and w/o the aux fuel pump.
When the aux fuel pump is running I get readings in the 4.5 -5.5psi range during cruise.
When I turn the aux pump off fuel pressure drops to the 1.0psi range +/- .5psi
I called one the Rotax service centers and they said that those readings are within the operating envelope of the engine.
Is this correct?

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Re: New fuel pump

by Roger Lee » 12 years ago

Roger Lee

126 5.13k 4.56k

Hi Glenn,

What type of plane? High or low wing? Does the engine sputter when you turn off the electric pump in cruise after about 5 minutes?
2.2 psi is the bottom of the acceptable range (2.2 psi to 5.8 psi). You need to put an independent gauge on the fuel line and see what it is running just to make sure your instruments are giving you good info. Bottom line after checking everything is you may need a new mechanical fuel pump.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: New fuel pump

by Glenn Kidd » 12 years ago

Glenn Kidd

0 2 0

Roger

Fk9 LSA from Fk Lightplanes of Germany. It's a high wing with wing tanks. I've not seen any engine sputter when the electric fuel pump is not in operation. It's a new aircraft. It will be down at Sebring in a few weeks. I'm planning on sending it over to the folks at Lockwood to take a look at it.

I'm using Dynon displays for engine instruments. Part of the problem is the engine display is so sensitive the needle continually moves through the operating range.

So far I've not been very impressed with the Rotax engine or support from Rotax. I have a cylinder head cover that leaks, the carbs had to be overhauled at three months because they would not hold when balanced and Rotax won't cover any of the work under warranty.

Glenn

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