Behavior of the saddle tank bypass valve does not work properly

[SnapRoll]

Hi all

 

I was testing the fuel system and noticed that the behavior of the saddle tank cross-feed valve does not work properly.

 

Here is what I did:

- Switch off left saddle tank pump

- Switch off saddle tank cross-feed

- Let the right saddle tank be drained empty - until right pump light goes off

- Let the service tank be drained to about 300 liters

- Switch off right saddle tank fuel pump

- Switch on saddle tanks cross-feed

- Switch on left saddle tank pump

 

Now the service tank gets filled up back to 400L as expected

The left and right saddle tanks more or less equalize again, as expected.

 

From here onward things go wrong, basically the right saddle tank stays at where it was after equalizing.

So eventually the left saddle tank and the service tank get drained empty and the engines quit at some point while the right tank is still half full.

Edited July 2, 2017 by SnapRoll