Fuel Pressure alarm

by Jim McConnell in General Tech Discussion 10 years ago

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Re: Fuel Pressure alarm

by Roger Lee » 10 years ago

Roger Lee

125 5.12k 4.53k

2.2 to 7.2 psi for fuel. If I was seeing 1.5 psi I would want to know why. Put a mechanical gauge inline and double check the pressure. This should let you know if it is a pump issue or sender issue. If the fuel pressure alarm is caused by fuel pressure fluctuations then put a fuel pressure dampener inline. It will smooth things right out.

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

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Re: Fuel Pressure alarm

by Charles Cholet » 10 years ago

Charles Cholet

0 4 0

I put my old pump back on and no more problems.
A friend of mine just replaced his with the new style pump and had identical problems. He too put his old pump back on and his pressure returned.
We got our pumps from different suppliers.
Seems like the is a quality control issue at the manufacturer.
I quick search on the internet shows a lot of people having this issue with the new pumps on a number of forums.

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Re: Fuel Pressure alarm

by James Dugan » 10 years ago

James Dugan

1 4 0

I had to put my old pump back on also, due to low pressure alarms. The old pump holds pretty steady at 4.5 PSI. Shame the new improved? pump can not keep a constant pressure.

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Re: Fuel Pressure alarm

by Al C » 10 years ago

Al C

63 138 106

I have the newer fuel pump in a box .
Although our older 912 (0ver 12 year and over 800 hrs) isn't,t on the list of serial numbers the replacement was noted for and no reason to think our fuel pump is lame or about to be was going to replace it because it is cheap should be easy ..in spirit of "an once of orevention.

Now that I read some(?) folks have low pressure annoyances, wonder if I should leave well enough alone? After all we do have aux electric pump for backup.

So , aside fro soliciting advice, here,s my other question:
My impression is that annoying(?) low pressure alarm is a feature of the aircraft , NOT something built into my rotax engin itself. right?
(Our Skyranger ELSA is basic on instruments, oil pressure, etc...no alarms of any kind on or in the panel.)

So if I install the new fuel pum there's no way I need to worry I could see the issue reported here?

Al

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Re: Fuel Pressure alarm

by James Ott » 10 years ago

James Ott

22 322 358

Yes the low pressure alarm is from optional fuel pressure instrumentation that many folks don't install. If you don't have the instrumentation, then you will be fat, dumb and happy with the new fuel pump.

As I mentioned before, there are 3 of us here in the Portland area with the same identical issue. One of us had the fuel pressure sensor taken off and sent to an instrument shop to be tested for accuracy, especially at the low pressures. It came back with nearly dead on accuracy. Therefore I don't feel Rogers suggestion of installing a mechanical gauge is worth doing. It also is not a pressure fluctuation issue because the low reading will usually last for 30 seconds or a little longer.

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Fuel Pressure alarm

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