RE: YS 53 FZ problem
Kostas,
This means either one of the following:
1. The engine is not pressurizing the fuel tank (either the engine isn't supplying pressure, or the one-way valve isn't working, or you have an obstruction in the mechanism).
2. The high-speed needle is too closed.
3. The mid-range is too lean (regulator pressure too low).
4. An obstruction in the fuel passages.
There is no other apparent reason.