Where is Fuel pressure normally sensed?

[Bcone1381]

I?m setting up values for an engine monitor that I ordered (EI-CGR-30p) and am researching engine limitations for a Lycoming IO-360-b1b (your basic parallel valve, 180 hp engine FI engine). The TCSD documents the fuel pressure value sensed at the inlet to the fuel pump of -2 to +35psi.

Do I really want the fuel pressure sensed there? A fuel pressure indication downstream of the engine driven pump seems more useful. If I choose the downstream location, what are normal values ....green arc, yellow arcs etc.

This unit will be used on a high wing aircraft with gravity feeding the gascolator then the electric fuel pump.

[Robin8er]

There is a fitting that goes on the fuel pump specifically for fuel pressure. From the pump it would go directly to the carb/injection system. If the fuel pump isn't pumping, it will indicate 0 psi.

[N520TX]

https://www.aircraftspruce.com/catal...clickkey=12225

That installs at the OUTFLOW port of the mechanical fuel pump. One hose to the carb/injector, and another to the fuel pressure transducer.

[snopercod]

Originally Posted by N520TX

https://www.aircraftspruce.com/catal...clickkey=12225

Dang. I wish I had known about those. I had an AN-2 fitting welded into an SAE Tee fitting. I have a traditional (non-electric) fuel gauge and it's a differential gauge with the low side going to the air box.

[Bcone1381]

Thanks! I placed one of those in my shopping cart. Also, I found the fuel pressure value for the supply to the servo... 14 - 45psi if the pumps are plumbed in series.