It's not in the right kick panel - check behind the glove box by removing the cover under it.
Remove the glove box. Two or three fasteners and you get best access.
I really appreciate the help. So far I have removed the whole right side of my 81 380sl and have stumbled on several relays behind the glove box. Some are silver others are black and even a nice anodized red one. is there one tell tale give away description or a pic for the fuel pump relay???They're both wrong. Remove the passenger side fender and sneak up on it from behind. It'll never know what hit it.