Solved

on the times how affect the fuel?

any can tell my what ntime you lose in a lap having more fuel?
for example
same compound similar drivers tyre economy 40 and 2 drivers, one with 10L and other with 30L

Usually you would have 1 car heavier than the other to prevent double stacking in the pits. You'll notice with similar talent drivers (most accurate measure of equal drivers), the heavier car loses quite a bit of time per lap, depending on the track (tracks with more slow corners will give you more difficulty in following cars in front of you).

My rough estimate is 1 extra L loses you about 0.1-0.2s, not counting for time lost due to slow corners. If it's as big a difference as 10L and 30L though, the difference is definitely not going to be 4s per lap. So once again, rough estimate.

EDIT: Corrected estimate from 0.2-0.3s to 0.1-0.2s

i dont know if im doing well this reult but in china in a 10Laps stint with 27Liters i lost with the 27Liters 1.35 seconds on this lap with the best time without fuel