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Low fuel pressure

  • savazosim
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1 week 4 days ago #22085 by savazosim
Low fuel pressure was created by savazosim
Hi
After 200 hours service, 912 uls with 400 hours.
On first flight, after about 2 hours of flight.
Suddenly 0 fuel pressure on cruise.
After adding electric pump no change and having coughs.
Down rpm to 4000 and the pressure goes a bit up to the minimum of range.
Mechanical pump has 4 years aged (new model).
New fuel pipes.
What is the reason?
Thanks,
Gil.

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  • Roger Lee
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1 week 4 days ago #22087 by Roger Lee
Replied by Roger Lee on topic Low fuel pressure
New fuel pipes? If you mean hose you many have hose particles clogged up in a filter, the screen in the fuel pump. Particles in the carb bowl wouldn't cause the pressure drop, but since your having this issue I would highly recommend you look in the carb bowls for debris. You could have debris in the pump or in a supply line or a filter before the pump that is not allowing fuel to get to the pump in any quantity. The last item is I hope your supply hoses from the fuel tank to the fuel pump are not 1/4", but at least 5/16" to 3/8".

This may help understand:

www.rotax-owner.com/en/rotax-blog/item/2...ation-considerations

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

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1 week 1 day ago #22136 by savazosim
Replied by savazosim on topic Low fuel pressure
Thanks,
The first filter was clogged up.
The following user(s) said Thank You: Gyrochook.

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5 days 7 hours ago #22240 by mirza
Replied by mirza on topic Low fuel pressure
Sir, I would like to know which rubberized items must be replaced at every 5 years.
What about protection tubes, heat resistant hoses and spiral hoses? These should be change or not at 5 year hoses replacement?

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5 days 7 hours ago #22241 by mirza
Replied by mirza on topic Low fuel pressure
My question was about 914 F

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5 days 7 hours ago #22242 by mirza
Replied by mirza on topic Low fuel pressure
What is the difference between hoses part no 860982 and 860985 for 914 F engines

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5 days 3 hours ago #22244 by Bill Hertzel
Replied by Bill Hertzel on topic Low fuel pressure

mirza wrote: Sir, I would like to know which rubberized items must be replaced at every 5 years.
What about protection tubes, heat resistant hoses, and spiral hoses? These should be changed or not at 5-year hoses replacement?


All Rubber Items.
Fire sleeving is usually Silicon but if you are already making it look pretty, Why Not!

A short list...
All Fuel, OIl and Coolant Hoses.
Any V- Belts.
All rubber parts in the fuel pump And Carburetors.
The Carb Rubber Mounting Sockets.

In Summary, If it is rubber, it is to be replaced.
If in doubt, replace it anyway.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
whertzel1@yahoo.com
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5 days 3 hours ago #22245 by Bill Hertzel
Replied by Bill Hertzel on topic Low fuel pressure

mirza wrote: What is the difference between hoses part no 860982 and 860985 for 914 F engines


The Short answer is that the ...982 part was replaced by the ...985 part and the 982 part is no longer stocked and the 985 part is readily available Off-the-Shelf.

Probably a change in the supplier mandated the number change for traceability purposes.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
whertzel1@yahoo.com
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The following user(s) said Thank You: mirza

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