English French German Italian Portuguese Spanish Swedish

 

Fuel Pressure ? please

  • AGLyme
  • AGLyme's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
2 weeks 2 days ago - 2 weeks 2 days ago #22032 by AGLyme
Fuel Pressure ? please was created by AGLyme
The 912is runs great, total hours are now 33. EMS is Dynon (in a FD CTLS). Since new, the Fuel pressure sensor, running pump 1 always ran at the top of the green (psi). When pump 2 was switched on, the reading was well into the yellow, coming close to the redline. At the 25 hours Dealer inspection and oil change, I asked that all fuel filters be checked for blockage. There was some sediment found in the engine fuel filter probably from airplane construction flotsam. A new "BMW" filter was installed.

After the plane was returned, when running on pump 1, the normal flying reading is about 44.3+. When pump 2 is engaged (takeoff and landing as per the manual), the reading goes into the yellow, but, not as much as before the 25 hours checkup and filter change.

Question please... do you believe I need to get the filter replaced again? As you can imagine, any instrument that reads yellow is disconcerting. Would appreciate any advice...

Thank you...
Last edit: 2 weeks 2 days ago by AGLyme. Reason: spelling

Please Log in or Create an account to join the conversation.

  • Roger Lee
  • Roger Lee's Avatar
  • Away
  • Administrator
  • Administrator
More
2 weeks 2 days ago #22046 by Roger Lee
Replied by Roger Lee on topic Fuel Pressure ? please
Many of the FD pressure spans are a little too narrow. Most of us have increased the top yellow alert number up at least 1 psi. This has taken care of many people. If it runs and hits close to 47 psi changing the filter has made a difference and making sure there is nothing in the gascolator screen. I have seen a few CT's with a thin gascolator screen that have collapsed so I put a stiffer screen in. Also a slightly courser screen because the original was a little too fine and I think the suction trying to move that much fuel caused the screen to collapse.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
The following user(s) said Thank You: AGLyme

Please Log in or Create an account to join the conversation.

  • Flocker
  • Flocker's Avatar
  • Away
  • Expert Boarder
  • Expert Boarder
More
6 days 5 hours ago - 6 days 4 hours ago #22202 by Flocker
Replied by Flocker on topic Fuel Pressure ? please

Roger Lee wrote: Many of the FD pressure spans are a little too narrow. Most of us have increased the top yellow alert number up at least 1 psi. This has taken care of many people.


If the max is 3.2 bar and the min is 2.8 bar, where do you recommend the red band begin?
Last edit: 6 days 4 hours ago by Flocker.

Please Log in or Create an account to join the conversation.

  • Flocker
  • Flocker's Avatar
  • Away
  • Expert Boarder
  • Expert Boarder
More
6 days 4 hours ago - 6 days 2 hours ago #22204 by Flocker
Replied by Flocker on topic Fuel Pressure ? please
My G3X Touch settings from the factory are:

Red Range: 0.0-2.2
Green Range: 2.7-2.8
Red Range: 3.2-3.45

No wonder it would turn yellow on T/O. The green range is very tight.

Roger, what do you recommend? I assume green should be 2.8-3.2. What about the red ranges?
Last edit: 6 days 2 hours ago by Flocker.

Please Log in or Create an account to join the conversation.

  • Roger Lee
  • Roger Lee's Avatar
  • Away
  • Administrator
  • Administrator
More
6 days 1 hour ago - 6 days 1 hour ago #22212 by Roger Lee
Replied by Roger Lee on topic Fuel Pressure ? please
This post is under the fuel injected engine so its fuel pressure is different than the carb version.

Carb 912:
Set low red at 2.2 psi and high red up at 7.0 psi. Anything else in the middle should be green. If you go over 7.0 psi (max 7.2) you most likely have a bad sender or a loose wire. I think most are running between 3.5 to 5.5 psi normally.

One thing to check few ever do is before a first start of the day turn the instruments on and see if there is any fuel or oil pressure. I see some with readings just sitting there cold. Bad sender.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
Last edit: 6 days 1 hour ago by Roger Lee.

Please Log in or Create an account to join the conversation.

  • Flocker
  • Flocker's Avatar
  • Away
  • Expert Boarder
  • Expert Boarder
More
6 days 1 hour ago #22215 by Flocker
Replied by Flocker on topic Fuel Pressure ? please

Roger Lee wrote: This post is under the fuel injected engine so its fuel pressure is different than the carb version.


I should have clarified. I have a 912iS. What would the settings be for it?

Please Log in or Create an account to join the conversation.

  • Roger Lee
  • Roger Lee's Avatar
  • Away
  • Administrator
  • Administrator
More
5 days 17 hours ago #22229 by Roger Lee
Replied by Roger Lee on topic Fuel Pressure ? please
I take it then your numbers are Bar and not psi?

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

Please Log in or Create an account to join the conversation.

  • Flocker
  • Flocker's Avatar
  • Away
  • Expert Boarder
  • Expert Boarder
More
5 days 10 hours ago #22231 by Flocker
Replied by Flocker on topic Fuel Pressure ? please

Roger Lee wrote: I take it then your numbers are Bar and not psi?


Yes

Please Log in or Create an account to join the conversation.

  • Roger Lee
  • Roger Lee's Avatar
  • Away
  • Administrator
  • Administrator
More
5 days 8 hours ago #22237 by Roger Lee
Replied by Roger Lee on topic Fuel Pressure ? please
Sorry I first misread and thought it was psi for the carb version.
Okay now I'm with you.
2.2 bar = 32 psi
2.7 - 2.8 bar = 39 - 40.5 psi
3.2 - 3.4 bar = 46 - 49 psi

The 912iS Operators manual numbers. page 2-3 under fuel pressure.

Max is 3.2 bar (46.5 psi) and minimum is 2.8 Bar (40.5 psi). So you may want to make an adjustment in your menu. Something like 2.8 Bar for red minimum and 3.2 or 3.24 bar 46.5 - 47 as high red. I don't know if your instrument has the extra decimal place past the tenth.
This means anything between 2.8 - 3.2 Bar is green.

Do these numbers look better to you? What I have been seeing in the field with my customers is 43-46 psi for everyday operations.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
The following user(s) said Thank You: Flocker

Please Log in or Create an account to join the conversation.

  • Flocker
  • Flocker's Avatar
  • Away
  • Expert Boarder
  • Expert Boarder
More
1 day 23 hours ago #22271 by Flocker
Replied by Flocker on topic Fuel Pressure ? please

Roger Lee wrote: Max is 3.2 bar (46.5 psi) and minimum is 2.8 Bar (40.5 psi). So you may want to make an adjustment in your menu. Something like 2.8 Bar for red minimum and 3.2 or 3.24 bar 46.5 - 47 as high red.


Problem solved - thanks!!!

Please Log in or Create an account to join the conversation.