Excuse me: how can a pen with a rubber tube attract more ink?
If this can not be solved, you can suck a part of the pen out, inverted (NIB upward), gently knock, so that ink into the hose, and then continue to suck ink, repeatedly, so that the pen "drink" full".
Pull out the iron sleeve outside the rubber tube and suck it again and again
First suck some of the hose, and then put the pen flat in the ink. It's OK inside
