Here is a link to Mike’s write up for his external relays. This was for the headlights but the same applies to the fuel pump connection in the same connector.      https://clubsmartcar.com/index.php?/topic/30055-mounting-external-relays-for-headlights/  

So check the connector if it’s melted a bit but where’s this external relay you mentioned 

SAM N-11-3 connector, probably heat damaged. Needs external relay for the electric fuel lift pump (and low beams on the same plug).

Good day, I noticed the last while my Fortwo after it  all warm and drive it say 50km stop then go start again it’s really hard starting. When cold no issue. No engine codes or anything . Any idea where I should be looking 

Selling my two Smart Car baseball caps. Excellent condition.   1. 2014 10th Anniversary in Canada white baseball cap. Limited production. Promo cap limited to Canadian dealerships. Only worn a couple of times. $50.00 CDN + Canada Post   2. Blue Smart Car baseball cap. World wide distribution.  Never Worn. $25.00 CDN + Plus Canada Post