Bloody new fuel pump

by Remi Guerner in 912 / 914 Technical Questions 13 years ago

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Re: Bloody new fuel pump

by Remi Guerner » 12 years ago

Remi Guerner

2 8 3

Hi Carlos,
Regarding the oil leak, you may make a few short flights and you will see that the leak will grow rapidly. This a good reason to replace the pump.
Regarding the fuel pressure, first you have to make sure the instrument is accurate. Most are not, especially at the lower end of the range. The pressure going down when you turn off the electric pump after take off is normal as long as it does not go below 2,2 PSI and then goes back up to about 3 to 5 PSI.
Remi

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Re: Bloody new fuel pump

by Jesse McNown » 12 years ago

Jesse McNown

0 4 0

I replaced fuel pump part # 892542 with # 893110. The replacement was because of high pressure. After the new model pump was installed the pressure is 7 psi. I haven't put a pressure gauge in the line yet but am planning to do this ASAP. I purchased the pump from L.E.A.F. Wisconsin. Another pump? I am a new owner and would appreciate any advise.

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Re: Bloody new fuel pump

by Roger Lee » 12 years ago

Roger Lee

127 5.2k 4.78k

Hi Jesse,

If you confirm the 7 psi reading then it should be replaced. It is too high and may cause rough running and fuel puking out the vents.

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

Thank you said by: Jesse McNown

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Re: Bloody new fuel pump

by Adam Bowers » 12 years ago

Adam Bowers

2 6 0

Greetings all,
I've recently installed one of the new pumps (p/n: 893110) on my flight school's Allegro. The pressure at idle comes right up to the red mark on the fuel pressure gauge and stays there (it's the stock Rotax gauge, the mark is ~.4 bar). The aircraft is equipped with a fuel return line to the fuel tank, so I bet it's actually pumping quite a lot more volume than needed, but it isn't indicating excessive pressure.
I installed the pump a couple months ago The previous part (I forget the p/n off the top of my head) failed to produce pressure, but didn't seem to be leaking. Last week, while the plane was aloft, I noticed a strange drop of fluid on the hangar floor in the plane's parking spot: It was a dark brown fluid suspended in a lighter, yellowish fluid, oddly, they weren't mixed. My first thought was "someone dripped while checking the dipstick" but this is making me think twice: drop of oil in a drop of fuel?
I ordered the part from CPS. I was corresponding with one of their agents about the pump, but right around New Year's the conversation abruptly ended.
I guess I'll call Lockwood tomorrow to see what they know about it.

Adam Bowers, CFI-SP, LSRM-A

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Re: Bloody new fuel pump

by Jesse McNown » 12 years ago

Jesse McNown

0 4 0

After installing the new pump the pressure was 7 psi so I removed the sending unit and installed a direct reading gauge. The pressure was 3.1 psi. I have replaced the fuel pressure sensor. We'll see. jesse

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