My gas light just when on so i filled it up i only got 45 liters in the car. That only converts to 11.7 gallons. then the gas pump clicks and i can't fill any more.

Is the problem still the sensor needs to be cleaned? then i will be able to put a full 20 gallons? since you said that a g35 coupe takes 20 gallons

 

i have the exact friggin problem, its driving me crazy, im ordering both sending units from infinitipartsusa.com at about 60$ each

 

Today i got 52 liters in my car. what the hell is this? almost 75 liters but not quite there yet.

 

There are some pictures here borrowed from DIY thread on fuel pump install, can you point where the q-tip'ing of the floaters go?

https://g35driver.com/forums/engine-drivetrain-forced-induction/190372-walbro-255-installation-diy.html

 

I took out the one side on the pasenger side and took out the whole unit and it was clean

 

I 'm one of g35 owners group in Hong Kong. Most of our member have the same problem on these too. The solution is driving your car a short distance (less than 1mile) after u filling up 3/4, then you go back to gas station and now you can re-filling up to full tank. You will probably see the guage needle pointing to full. Try it, its really work.