Problem beside tomato plants (details)? They produce few flowers, and no fruit after several weeks. The soil...

They produce few flowers, and no fruit after several weeks.

The soil is tended as it should be. There have never been yellowing or drooping, nil indicating poor health. The plants own thrived from day one, and grew to be substantial. They grew as fast or faster than regular, and look perfect. They get hold of not too much and not too little water, not too much and not too little sun. They should enjoy definitely fruited by in a minute, it has be several weeks. The flowers are few, and withering from old age. Only one fruit have come of them. These plants are large, and it is powerfully past time for them to flower and fruit.

Any concept? I would guess that it is the condition of the soil, but I don't have adequate money to put gas in the motor, much less for a soil trialling kit. If you muse it is the soil, then what specific soil condition do you suspect?

Thanks.
Answers:    All of the fertilizer accepted wisdom are good--but having experienced this myself, I would suggest you sidedress beside a couple of handfuls of plain old Epsom salt per plant. Wait a couple of weeks and week what happens.
You didn't mention fertilizer. From your description of the plants' growth they are getting adequate nitrogen. The key would be whether they are getting plenty potassium and phosphorus. I'd feed them next to the recommended amount of a good hanging tomato food - Miracle Gro powder is a good one and see whether they set blossoms.