French to English Tech/Engineering Engineering (general)

Hello,

Just want to be sure about the word "fleur" cause I don't think it has only one meaning ... Here you will see the contexte for this word:

On ne devrait pas trouver sur la meme piece les defauts lies a un probleme de solidification : fleurs et gouttes froides.

(=We should not find on the same piece the defects correspond to the problem of solidification: Flowers and cold drops ?).

I also want to know if "boucher l'extremite d'une pompe a velo" means "clog the extreme side of bicycle pump"

Merci mille fois!!