'88 230E not Starting Up

[Ascottz]

Hello All,

I have noticed that on two occasions now I have switched off the engine
(after a journey) and the car refuses to start when I try to start it up
again within a few minutes.

Once it is left alone for about 10 minutes it will then start up first time.

It is not fuel related as I have a full tank.

Does anyone have an idea what it could be, I suspect a relay but don't know
which one.

Thanks


Andrew