Re: Hard to restart after running for a while 380SL

Sounds to me like good 'ole fashioned VAPOR LOCK. Frustrating problem because sure, it's easy to diagnose, and even though it's a hassle  it's easy to deal with right there and then it's hard to coax it to go away for good. 
Go to your parts place and bite the bullet on a can of starting fluid (I like the brands that give the straw - better aim. Get the engine warm like you describe, & when it vapor locks, pop the air filter/carb cover off and top and have someone turn the key. A couple of 2- second squirts & it'll start, but then what? Well, there are lots of ways to minimize it but maaaaan, ya can't beat a $3 can of starting fluid.

https://help.summitracing.com/app/answers/detail/a_id/5242/~/what-is-vapor-lock%3F#:~:text=The%20first%20step%20in%20preventing,the%20fuel%20in%20the%20lines.

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