Fuel not coming steady

hello dear friends. my last two lanterns have some issues regarding fuel nipple. the fuel coming brokenly not steady. what are your valuable opinions

 

@Unsal erten Prick the jet nipple until fuel flow is reliable. Are you testing the lanterns ‘cold’ with the hood and inner hood removed or assembled and fired up? What model(s) of lanterns?

 

Hi again, i test it cold condition i mean: pump it until 2 bar then, open the needle l realised that fuel coming not steady.

 

Lantern model is hasag

 

Maybe the nipple is blocked/damaged or the vaporiser has carbon in it ?
I would also make sure the tank is clean inside.

 

I will check all of them asap. Thanks for your opinion. Appreciated

 

WHICH HASAG MODELS ARE THESE?

 

These are GDR made 200CP lanterns manufactured by VEB Leipziger Werke (or VEB Leuchtenbau Leipzig), which are often found in Türkiye. At least the one in the middle seems to have a tank from an Optimus lantern.
Nice lanterns though, and reliable runners once properly maintained.