Where to pick up fuel pressure?

[DBeaulieu]

I have an IO-360, AFP fuel servo and using EFII boost pump. I surmise that you want to be able to measure fuel pressure downstream of both fuel pumps (boost and mechanical) and also past the last fuel filter prior to the "servo". How is this accomplished? Not making sense to me on how best to do this? Vans has a port fitting for the mechanical fuel pump which you could Tee a line to a pressure sensor. But, that doesn't get you pressure past the filter prior. Any thoughts would help! Thanks so much

Cheers Dave (from Maine)

https://store.vansaircraft.com/kb-090-t-fuel-pump-tee-fitting-kb-090-t.html

[Bcone1381]

I have no filter between the engine driven pump and the Bendix fuel servo. I'm curious about the placement of the filter. I followed AFP Installation manual Rev1. Paragraph 3-4 says the filter "Should" be installed before the fuel boost pump after the fuel selector.

So, I used the Vans fitting you refer to for the Fuel Pressure tap.

https://airflowperformance.com/wp-content/uploads/2023/04/Merged-Manual-Rev.-J.pdf

[Nev]

I used the Vans T fitting which has been working just fine.

[Battson]

I surmise that you want to be able to measure fuel pressure downstream of both fuel pumps (boost and mechanical) and also past the last fuel filter prior to the "servo".

I assume you have a filter before the electric fuel pump.

Are you saying there is a filter after the engine driven pump, in additional to all the other filters and gascolator? There's a finger-strainer inside the servo which is the last-pass filter.

I used the fitting you have pictured, and took the pressure reading off the side of the engine-driven pump.

[DBeaulieu]

Battson Bcone1381 ne Nev Okay, did a bit more reading/research and it seems that mechanical fuel injection really only needs a prefilter for the boost pump. The EFII Pre filter is 90 micron which I will place after the fuel selector/gascolator but before the EFII boost pump module. I had electronic fuel injection on a previous engine and that required a Post filter of 10 micron prior to the injectors but after the boost pump. I was confused (which happens when brainstorming by myself!) Thanks to all who chimed in and made me do my homework. On a related note, according to my documentation, the AFP-150 fuel servo has a 75 micron filter at the fuel inlet fitting...FYI...

Cheers! Dave (from Maine)