[Solved] Nac T675 Mower: Fuel Pump (Primer) Isn't Drawing Fuel - Possible Carburetor Issue?

Hello. My mower cannot ignite. I pump fuel with a pump. According to the instructions 3 times and the mower does not ignite. After unscrewing the fuel pump (primer) and dismantling it, it turns out that it is dry inside. I removed the air filter and poured some fuel in with the syringe. The mower caught up after two pulls and operated normally. Is it possible for the pump to break? After dismantling, there is only a spring inside, or is something about the carburetor wrong?

Approx. I thought it worked just like a two-stroke grass trimmer that pumping fuel into. So what can be the reason that the mower does not start. After pouring fuel into the carburetor with the syringe from the air filter side, there are no problems with firing.

I had a similar problem with the carburetor / pump on a Brigs engine. The reason was a damaged, not "tight" seal between the carburetor and the air filter base in which there is an air duct from the pump.
Gasket of this shape:

Finally succeeded.
The problem was in the unoriginal gas line, which I had to replace. It turned out that it was too tight. After pulling a few millimeters, everything returned to normal and the mower works.