M20J Fuel pressure drops as engine warms up

[GregF]

Congratulations Robert, it would be reassuring to find an instrumentation problem. The old transducers are highly suspect. Unfortunately my transducer is fairly new and I had the system calibration verified. I'm afraid a new fuel pump is on my short list. 

My fuel pressure only drops to 14-15 psi, right at the bottom of the green pressure range. Pressure comes back to 22-25 at idle so I am suspecting the pump capacity may be failing. I'll post an update when I get mine solved. 

Greg 

[Robert A. Reed]

On ‎4‎/‎2‎/‎2017 at 11:55 AM, Robert A. Reed said:

Greg, I put new O rings in the sump drain. Ran it up. Still had the problem! Did a full power check. Fuel Flow was solid, but fuel pressure did not improve! About 10psi.

I put it back in the hanger! My mechanic told me it probably needs a new Fuel pump, or the servo needs overhaul! I pulled the old fuel pressure transducer (probably original), it had small grains of Something coming out of it! I put on new transducer! Checked for leaks. Ran it up! It held 24-25 psi just fine!! I think the problem is solved! I will check it again when I get the cowling on and fly it!

Bob

I have flown the plane a couple of times since new transducer. Holds 22 lbs in flight! Fuel flow is normal! Fixed!!

Bob

[BobAustin]

Have a similar problem with indicating low flow even after replacing engine driven and boost pump on my Cont IO550.   Plane has original  201 transducer...where did you get yours ?

[Robert A. Reed]

Bob, got it from "Chiefs". About $36.00! I don't have the exact part# in front of me, but you can search it on Chief's web site. Last 4 numbers of part # was 2000.

[Guest]

On May 21, 2017 at 7:08 PM, BobAustin said:

Have a similar problem with indicating low flow even after replacing engine driven and boost pump on my Cont IO550.   Plane has original  201 transducer...where did you get yours ?

The Floscan 201 measures flow rate, the OP is referring to fuel pressure, a different transducer entirely.

Clarence

[BobAustin]

Opps...I should have said low PRESURE not flow.

[Robert A. Reed]

I thought that is what you meant Bob! BTY, how does the Rocket fly? I had a N35 Bonanza with a 260 in it. Always something Expensive wrong when I wanted to fly! Sold it. Got a 201. The 550 must be a blast!

Bob

[carusoam]

Adding to the conversation...

The long body didn't warrant a fuel pressure gauge for the IO550...

It got the FT101 FF instead...

Go IO550!  

Best regards,

-a-

[BobAustin]

I thought that is what you meant Bob! BTY, how does the Rocket fly? I had a N35 Bonanza with a 260 in it. Always something Expensive wrong when I wanted to fly! Sold it. Got a 201. The 550 must be a blast!
Bob

Well the NA io550 for 201 by Rocket Engineering is called Missile. 231 conversion is tsio520 called Rocket


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