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

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


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