Fuel pump RG17980p

[JurcaSperocco]

Hi,

I'm looking for a maintenance manual with a description of the Kelly Aerospace RG17980p (Lear/Romec) mechanical fuel pump. My engine is a 300 hp AEIO-540-L1B5D.

I'd like to know where the return line is, A or B ? Both ?



Thanks for your help.

[rocketbob]

I don't have a manual but I've had these apart. I believe the left one is the bypass return and the right one is a drain so that if fuel gets past the seal it does not get into your engine oil. Not 100% sure since its been several years since I've had one apart.

[mahlon_r]

The pump does not incorporate a return. Both fittings you highlighted are vents.
Good Luck,
Mahlon

[JurcaSperocco]

Thanks++

Are these vents (A & B) supposed to be plugged somewhere?

Do you know where I can download a manual for this pump? (I've only found service bulletins...)

[mahlon_r]

Don't know about the manuals.
The vents should be open to atmosphere and they may normally be plumbed overboard or to an area where if one leaks fuel, it won't cause any fire type problems.
Merry Christmas,
Mahlon

[JurcaSperocco]

Thanks!

I will contact the manufacturer to get a manual, especially because I need to understand where my engine return line is...

The last doc I've found is this article: http://www.kellyaerospace.com/articles/Romec_AMT.pdf

happy holidays season.

[Don at Airflow]

You probably have Bendix RSA fuel injection on this engine. There is no fuel return with this system.

Don

[JurcaSperocco]

Yes indeed! The fuel injection is RSA10-DB1.

As you see, I'm discovering injection system...

So the problem is solved.

Thanks a lot!!!

[Don at Airflow]

Sounds like you have a mixed bag on your fuel injection system. As far as I know the AEIO-540 has a Romec RG-9080 pump on it. The RG-17980 is typically used on an IO-540 K engine. In your case being experimental, it doesn?t matter the 17980 will work.

On the other hand you should check the data plate on the servo. If you indeed have an RSA-10DB1, this servo is used mostly on TIO-541 engines (like in a Beechcraft Duke). It will not run a naturally aspirated Lycoming. The servo could have some of the internal parts changed and be re-calibrated to operate a naturally aspirated engine. Again the AEIO-540 engine typically uses an RSA-10AD1 P/L 2524318.

Don

[JurcaSperocco]

Thanks Don for your precious contributions.

My engine was equipped like this, so, reading your post, I've checking the RSA Servo applications page on www.precisionairmotive.com :

The RSA-10DB1 (part 2524855) fits the AEIO-540-L, just like the RSA-10AD1 you mentioned.

Everything is getting clearer now.

Thanks again. Good Flying!