Questions.
Q1.There are grease stains when you open the package, has it been used?

A:Every carburettor is tested for fuel tightness, passage and pressure before it leaves the factory, so there will be some traces of fuel residue. All products are brand new and have not been used.

Q2. I have a leak problem after the first installation, how can I fix it?
A:The filler valve is sticking from residual fuel drying out, so you can tap the filler port with a small hammer to loosen the valve a bit before you install it.
If you install it and find fuel leaking, just remove the carburettor and dump the fuel inside and install it again.

Q3. The carburettor was installed and could not be filled with fuel.
A.Same problem as Q2. Tap the fuel inlet with a small hammer to loosen the fuel valve enough.
Also check the fuel input pressure to make sure it is between 4.5 and 8 PSI.