Strange Fuel tank usage

pcmpete

2010 360 EC.  My starboard fuel tank level drops more that the port side.  Is this normal or what issue should I look for? 

It is not VV display issue, the fuel dock pump confirms it.  

It does the same even if I don’t use the generator.
Each tank valve is fully open and cross feed valve is fully open too.   

Any ideas???

Thanks

Aqua_Aura

Maybe a blocked vent so it is pulling more from the starboard? 

pcmpete

Aqua_Aura said:

Maybe a blocked vent so it is pulling more from the starboard? 

Block vent on the port side?

Aqua_Aura

Just a thought but yes. Maybe the vent is plugged with some nesting bugs or something so therefore it is drawing more easily from the starboard side.

You have VV? Is one engine burning more fuel GPH? This would be a different issue. 

I am not completely familiar with your fuel system but others on here who are familiar will have other info for you. 

reneechris14

Cross over valve should be closed so each engine uses its own tank.

aero3113

@reneechris14 is correct, the crossover valve should be closed.

Aqua_Aura

Apparently I suck at the clarinet 😂

pcmpete

reneechris14 said:

Cross over valve should be closed so each engine uses its own tank.

Ok I will try that at my next fill up.
 I hope this is not a silly question, but if it should be closed why is it where ? I am new to twin engine and twin tank setups.  

Dream_Inn

It allows you to run both engines off of either single fuel tank.

LaRea

For example, suppose you get contaminated fuel in the port tank.  Close the port valve and open the crossover valve -- both engines will draw from the starboard tank.

Liberty44140

X3, when I got my 310 I had the same, one tank drained a lot faster than the other. Path of least resistance. All three valves were open. Closed center valve forcing each engine to draw from its respective tank and voila, tanks drained at the same rate (well generator side always drains a little faster due to running the genny)....

benvenuttioki

I have the same thing on my 370. Crossover closed. No gen usage. Stbd uses more fuel. GPH aren’t exactly the same, but close.