Hi, I have just had a 100 hourly completed by my LAME, he picked up a problem that could be related to uneven fuel feeding between tanks. When he removed the wing root covers, he found the right rear fuel feed line kinked so tightly, it wasnt feeding any fuel at all. The fuel only fed from the front pickup. This would explain why the fuel aways fed from the left instead of more even feeding. We managed to get it straightened to the correct radius for the fuel to flow. It pays to have a thorough check over the plane as even the factory can miss things.
Cheers, Q.