Andair Fuel Pump - Mount (Video) - Page 2

Phil · #11 10-13-2010, 08:15 AM

Quote:

Originally Posted by glastar

Phil, one question I like the Andair what you've got is the one with AN6 fittings but it is good according their tech sheet for 16 gallons with 27-30 psi. Looking at the sheet for an IO-540 it says full power sea level are around 22 gal/h. It seems a bit strange, that Van's went with the 3/8" fuel lines instead the larger 1/2" for the IO-540. Do I miss something here?

Thanks for a clearing info

BTW anyone having the data for the ES Airflow pump?

Werner

Hi Werner,

That's a question many of us raised too. See this thread.

http://www.vansairforce.com/communit...ad.php?t=62884

Van's uses the 3/8" lines and Andair's recommendation is for the 3/8" fittings on the RV-10 pump.

I find it bizarre too, but I'm deferring my decision to Van's and Andair's engineers.

Phil

glastar · #12 10-18-2010, 03:15 AM

Hello Phil,

I had a question with Andair in already when I posted my question here their answer states, that the free flow is large enough:

Quote:

Dear Werner,
The PX375-TC will be more than satisfactory to supply your IO540. The pressure relief valve is set at approx. 35psi.( That means in the 'No Flow' condition the relief valve opens and the pump recirculates internally)
Flow at 25/28psi would be at 30 gal/hr.

I will however ask about what when engine pump fails

and post comments here.

Anybody out there having the technical data for the ES Airflow pump which Van's sell?

Thanks

Werner

Phil · #13 10-18-2010, 06:09 AM

It should not be a big deal when the pump fails because you still have the mechanical pump. It's only switched on during engine start (to prime the system), climb out, and landing (in case you need to go around and climb out again).

If it did fail the flow rates might drop just a touch but not enough to be noticeable.

I've flown FI engines with the pump accidentally turned off during TO/Landing without the boost pump running. It's not problem but also not something I would make a habit of doing.

A lost boost pump should not be an emergency. A blocked filter is though.

glastar · #14 10-18-2010, 08:31 AM

Hello Phil,

I did think what if the mechanical pump fails (then relaying on the electrical). But Andy from Andair just confirmed, the PDF on the web is outdated:

Quote:

Our spec. sheets don't seem to keep up with our pump development, yes 30gal/hr at approx25/28psi. We will get the pdf changed in the morning!

So it is clear for me the Andair instead of the ES Airflow.

Cheers Werner

Phil · #15 10-18-2010, 08:47 AM

Awesome... That had me quite confused too.. I couldn't figure out why Vans when with 3/8" lines if the pumps didn't match.

Good stuff.

BTW - Just got a phone call that the finish kit is waiting on me at the airport. I get to drive out there tonight, load it up, and bring it home.

Phil

dhmoose · #16 04-30-2011, 09:30 PM

Phil,

Was a conclusion reached on whether or not the Andair pump (or your installation of it) has a filter bypass for a clog? Not knowing much about fuel systems, I am not sure how most aircraft are plumbed with regard to the filter bypass and I am reaching that stage of the build. In fact, I was removing the Vans supplied fuel flow transducer mount this morning (QB).

David

Phil · #17 05-03-2011, 08:36 PM

David,

The Andair setup does not have a clogged filter bypass. I can't speak for the Airflow Performance setup, but I don't think it does either. I'm sure someone will correct me if I'm wrong about the AFP - it is the internet after all.

The Andair setup is really nice though and I like the way it came out. The only thing that changed after I shot the video is that I decided to keep the longer aluminum fuel line. I added a couple of supports with adel clamps to support the line. You can see a photo of it here...

http://www.matronics.com/forums/files/photo_497.jpg

Phil

Bill Palmer · #18 05-03-2011, 10:04 PM

A Safety ?Heads Up:?

Unfortunately, a recent inspection/test of a new, but failed, Andair fuel pump discovered three potential design and/or manufacturing problems:

1. Check Valve O-Ring Security.
2. Anti-Rotation Pin Size and Fit.
3. Pump Component Wear.

See the following current thread including Andair?s response.

http://www.vansairforce.com/communit...ad.php?t=71529

Particularly, watch the failure analysis video.

Until Andair comes up with flight-acceptable fixes/dispositions for each of these three problems, it would seem prudent from a safety standpoint not to install or fly an Andair fuel pump . . . my opinion, anyway.

Build and Fly Safely,

Bill Palmer

P.S. My Andair fuel selector is great; I?m surprised that Andair?s fuel pump design/manufacturing has become an issue.

dhmoose · #19 05-04-2011, 12:45 AM

...for your responses. Bill...it seems like you hit a nail on the head with your assessment of the pump seeing as Andair not only talked about some of these issues but has also addressed them with their new design. Nice job!

As usual, it looks like a judgement call needs to be made to either stick with tried and true (Vans/AFP) or go with the Andair pump (newer version with improved design to address the issues that Bill pointed out).

David