Non Fruiting Tomato Plant

Question

My tomato plant is now 3 feet tall, has had lots of flowers but produced not fruit. The new end leaves are slightly yellow.

Answer 1

Temperature and poor pollination are possibilities. Here is more:

https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossoms-no-tomatoes.htm

https://www.gardeningknowhow.com/edible/vegetables/tomato