Don’t you start anymore?

Hello Saab municipality I drive a 9000i V16 Bj.87 306000Km and have the following problem: Cold start no problem if the motor is warm for hours nothing at all. The engine turns through but it does not start. I have already checked the following. -Benzinpump surrt -Zündfunke an den kerzen ist da -empty running regulator cleaned -low pressure hoses OK – safeguards all ok Who can help me???