RE: New mcd cy motor tuning trouble(gas tank)!
I noticed this when I first got my RR too, there is a fair bit of washing around going on in the tank and I was seeing bubbles in the fuel line even at about 1/2 tank to 2/3 tank level after venting the tank as well as before and even replaced all tubing incase there was a hairline split in it that I couldn't see. I tried weighing down the clunk in the tank with additional weights (it was pretty lame the factory installed clunk) and then ended up fitting an HPI baja clunk/filter and it has been okay ever since.