Fuel Flow Monitor Transducer Location.

[Lowlevldevl]

Hi again folks (and Happy New Year)

I'm installing an EDM 700 Graphic engine monitor in my Long EZ. (I really want to know whats going on back there!) I got the fuel flow option with it and was wondering if any other EZ owners have the same.

My O-320 has a fuel return line Tee'd into the feed line right where it goes into the carburettor. I need to fit the fuel flow transducer in AFTER the return line tee to get an accurate fuel flow reading. The limited space between the engine and the firewall is going to make plumbing a real hassle I think.

Do all EZ's with the O-320 have a return line and what is its primary function?

My fuel flow transducer would be a much easier fit if the return line wasn't there.

Regardless of what responses I get, I WILL talk to a certified engine guy about this before I do the fit but was hoping for some EZ insight from the knowledgable in our little community first.

Cheers,

Don

[Juan Rivera]

When I had a MA4 carb I did not have a fuel return line. Are you sure it is not a line intended to go to a fuel pressure sender?

[Lowlevldevl]

When I had a MA4 carb I did not have a fuel return line. Are you sure it is not a line intended to go to a fuel pressure sender?

Juan,

Thanks. I hope you're right. I'll be back to the aircraft next week and that'll be the first thing I check!

[cdavis]

I made a simple aluminum manifold whose input is from the electric fuel pump.

 

I plan to bolt this manifold to the firewall.

 

The solenoid primer valve screws into one branch of this manifold, and it is screwed to the firewall too. (that is, the solenoid points away from the firewall).

 

The other outlet of this manifold goes to the mechanical fuel pump, and points straight up.

 

My goals were this:

1. make everything a small package

2. make everything firmly bolted to the firewall, rather than hanging on the engine mount

3. reduce the number of hoses to a minimum

 

So, to recap; the "fuel manifold" is an aluminum block with 3 drilled and tapped holes:

Input=from electric fuel pump

Output 1= hard barrell connection to solenoid primer valve

Output 2= hose fitting for connection to mechanical fuel pump

 

The manifold is bolted to the firewall with two #10 screws.

 

I hope this helps! I have not flown yet, but the whole thing seems simple and solid.

[Lowlevldevl]

Yeah Juan,

You were right! It was just the pressure line. Thanks.