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-   -   AN fittings with Port for Pressure Measurement (https://vansairforce.net/community/showthread.php?t=170135)

steve murray 03-31-2019 11:25 AM

AN fittings with Port for Pressure Measurement
 
In the process of installing SDS fuel injection system, need to monitor the fuel pressure and not real excited about having a bunch of fittings\adaptors to do this. Found this site that has AN fittings with female sensor port. This should help me eliminate a lot of fittings and\or long hose. Curious if anyone else has used these type fittings?


http://www.anhosefittings.com/fittin...3p1cdhr4klk1eb

They also they had fire sleeving at much lower cost than spruce.

Ordered some parts, will update once I receive and inspect parts.

svyolo 04-02-2019 12:45 PM

Summit racing is a pretty good place for fittings. I have seen the fittings with pressure ports there before.

Toobuilder 04-02-2019 01:49 PM

Not sure what your specific system architecture looks like, but both the SDS fuel pump module and their recommended (Borla) regulator have multiple unused ports which can be used to feed a pressure transmitter. Beyond a simple reducer, no adapter needed.

jacoby 04-02-2019 02:49 PM

FWIW, it looks like Holley is getting rid of or retooling their Sniper line of fittings. Everything is around 70% off

https://www.holley.com/brands/sniper...earance_parts/

DanH 04-02-2019 03:53 PM

Remember, technically none of that stuff is a real AN fitting.

snopercod 04-02-2019 06:26 PM

Now THAT is a useful website. Thanks! For my fuel pressure takeoff I had to have a steel AN2 fitting TIG welded to a steel SAE Tee.

svyolo 04-03-2019 02:49 PM

The auto racing stuff isn't any cheaper than AN stuff bought from one of the big aircraft vendors. But sometimes they have some unique stuff that works a bit better.

steve murray 04-03-2019 03:17 PM

Quote:

Originally Posted by Toobuilder (Post 1336402)
Not sure what your specific system architecture looks like, but both the SDS fuel pump module and their recommended (Borla) regulator have multiple unused ports which can be used to feed a pressure transmitter. Beyond a simple reducer, no adapter needed.

Hey Michael

I am installing the SDS system and have the fuel manifold (with several open ports) located on the top of the engine but did not really want to run another small fuel line for pressure measurement back to the firewall. I was looking at the Borla regulator from Ross, is the plug on the side removable\useable....I was going to call Borla. Also, do you know if regulatory mounting orientation is critical?

Thx

Steve

Toobuilder 04-03-2019 04:48 PM

The Borla unit I have has two outlet ports (it's a "T" configuration). I my case I have a bulkhead fitting as the fuel outlet through the firewall, and the other side has a reducer and the transmitter screws right into that.

Edit, I drilled and tapped the cap provided with the regulator... It's simply an AN plug.

steve murray 04-04-2019 05:52 AM

Quote:

Originally Posted by Toobuilder (Post 1336700)
The Borla unit I have has two outlet ports (it's a "T" configuration). I my case I have a bulkhead fitting as the fuel outlet through the firewall, and the other side has a reducer and the transmitter screws right into that.

Edit, I drilled and tapped the cap provided with the regulator... It's simply an AN plug.


Hi Michael.

I follow the part about tapping the cap on the regulator but am not following the part about the bulkhead fitting with the reducer. Can you send a picture?

Thx

Steve

majuro15 04-04-2019 06:58 AM

Have you asked Ross about this? As mentioned there are a few different areas for the sensor to go. Why would you need to run another fuel line from the fuel distribution? I'm about to install the system, so maybe I'm misunderstanding something.

DennisRhodes 04-04-2019 07:30 AM

Those fittings would come in handy for ground testing an electric sensor against a pressure guage say oil or fuel pressure when the sensor error was suspected. Would make a great tool box item for the A&P.

Toobuilder 04-04-2019 08:31 AM

Quote:

Originally Posted by steve murray (Post 1336836)
Hi Michael.

I follow the part about tapping the cap on the regulator but am not following the part about the bulkhead fitting with the reducer. Can you send a picture?

Thx

Steve

The salient point of my post was to confirm that the regulator has two ports sharing a common chamber, so both see the same output (fuel rail) pressure.

The part about the bulkhead fitting was just my implementation - not an endorsement. But in short, a standard straight bulkhead fitting has a short side and long side. In my case, I threaded the short side into the regulator, leaving the long side to penetrate the firewall. Made for a clean way to mount the regulator, that's all.

steve murray 04-04-2019 10:26 AM

Quote:

Originally Posted by majuro15 (Post 1336853)
Have you asked Ross about this? As mentioned there are a few different areas for the sensor to go. Why would you need to run another fuel line from the fuel distribution? I'm about to install the system, so maybe I'm misunderstanding something.



Hi Tim

The fuel manifold from Ross for my installation has a lot of open ports but the block itself sits on top of the engine. I am trying to avoid placing the fuel pressure sensor on the engine due to high vibration area. In order to get a pickoff spot to measure the fuel pressure, I could put a line from manifold block (that sits on top of the engine) back to the firewall where I plan to install the pressure sensor or use some type fitting on\around the regulator to access the fuel pressure.

I am going to pursue the earlier post about removing the plug on the Borla regulator and using that as a pressure pickoff port. I have a call into Borla to make sure I am not overlooking something.

Take care

Steve

majuro15 04-04-2019 11:28 AM

I gotchya now. Yes, I think the pressure regulator option is the best. Ross just sent my install kit out, so please post what you find out. I'd like to do the same. I'd rather have the reading closer to the injectors than the fuel pump outlet itself. Thanks!

TS Flightlines 04-04-2019 04:47 PM

Most of the ones we have plumbed have used one of the manifold ports, to a hose to the VA168 mounted on the firewall. Pressure sender mounted on the VA168. The manifold is reading constant pressure.
You can tee into the return side line before the regulator, and put the sender there.
Check Earls #100199ERL----6 male and female with a 1/8 NPT female port for the sender.

Tom

svyolo 04-04-2019 07:57 PM

Why not just use one of the unused ports on the fuel pump module? The output pressure should be the same as at the fuel manifold. Or close enough for government work.

Toobuilder 04-04-2019 09:08 PM

It should be... Unless the regulator fails. Moving the transducer on the controlled side of the regulator adds one more element of information for on the spot troubleshooting. After all, the primary consideration is the pressure seen at the injectors.

As for running a line off the distribution manifold... Assuming the regulator is on the cold side of the firewall, the transducer plumbed into the common chamber shared with the injector rail (the "extra" port on the regulator) is hydraulically identical to running a hose from the distribution manifold to the VA 168 pressure manifold, but with less weight, leak opportunity and cost.
No need to make this harder than it needs to be.

majuro15 04-05-2019 06:34 AM

Is the regulator typically mounted on the cold side of the firewall? I thought it'd be FF?

TS Flightlines 04-05-2019 06:59 AM

Ross likes it FWF

Tom

Toobuilder 04-05-2019 09:19 AM

Hydraulically it makes no difference where the regulator is physically located, so long as it is downstream of the injectors. The regulator functions by bleeding off excess pressure, so all the fuel lines from the pump output to the regulator are going to be the same pressure. Less some miniscule line losses (or an outright blockage), a pressure transducer screwed into the pump module manifold, the injector manifold, the extra port on the regulator, or a T fitting anywhere in between will all read the same.

In my case I'm using a tubular fuel rail rather than the injector distribution block that Ross offers and the regulator made more sense to mount to the firewall. As long as I was at it, I decided to mount it "through" the firewall which neatly solved the mounting issue and several extra fittings. One step further and flip the assembly around and the regulator is now on the cold side and provides an even better location for the pressure transducer. In my case it was simply packaging synergy.


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