Fuel Flow Setup in NoCal

[n86121]

Perhaps a bit more expensive and invasive is to have the fuel pumps pulled and then setup on lab bench. Then checked on aircraft.

I had my entire rear fuel and intake system, throttle, intake, fuel pumps pulled and overhauled when I put in GAMIs. (TCM injectors were backlogged, but GAMI were available, so easy decision to swap them all).

I noticed after that the rear engine took almost zero manual adjustment with climb and descent. Pretty much deade center all the time.

Whereas the front I had to do a lot of leaning and fidgeting.

So next annual I had the same done to the front.
Similar results as rear.

They found ancient gaskets in throttle, and spider, leaky gaskets etc.

Ballpark total was around $1-2k each engine, but now the fuel systems are like new.

[amexbmorgan]

Yeah - I had both pumps and dividers rebuilt. Front is fine, rear hight pressure is low.

I guess is need to fiddle around a bit.

[Joes]

Thanks for the helpful information on this issue. I found this article, hope it helps. Had been fighting this issue for a while.

Now find your engine model number on TCM SID97‑3 and verify your unmetered fuel pressures are within limits at idle and at full manifold pres*sure. Let's talk about the term "within limits". I have found that on the TSIO‑360‑GB and ‑LB engines, it is best to set the idle pressure right in the middle of the limits, but the full power pressure should be set at the maximum pressure setting. The reason? When the engine gets hot, the metered fuel flows tend to drop causing a lean engine just when you need a richer (cooler) engine. Even if you have a new engine or a recent fuel pump overhaul, don't think you are okay. Never have I seen a TCM or any other overhauled fuel pump set up for maximum pressure at maximum mani*fold pressure.

[amexbmorgan]

I found this article.

Looks like I might be building testing gauge setup.

https://www.tennesseeaircraft.net/20...id97-3e-again/

Bryan

[B2C2]

I take my 1969 T337D to TriValley Aviation at KLVK. They are pretty competent and can probably do this for you.

[amexbmorgan]

Perfect. I'll reach out to them.

[amexbmorgan]

TriValley Aviation at KLVK got my fuel flow issue resolved. They were awesome!