Autogas conversion S430

hello, I had my car converted to amberg two days ago. a prins-system was installed. runs great. only the mechanic after full refueling noticed that the tank indicator for the gas did not radio and the swimmer hung up (it was told to me). that is then done at the 2000km check because the tank should be as good as empty so there is no explosion risk. throughout very friendly people and as far as I can judge very clean work. tüv was gema cht, but I get the exhaust test sent home in two weeks. and invoice is sent out together with the report, is that usual? so far so good, only I noticed yesterday when the tanking process became very slow, at the tomasetto connection (about which was the tap gun) some gas has leaked out. so not at the connection but at the screw that I screwed over it. is that normal? an 84liter tank was installed in the wheel dump. have the value compared to the bc and I have almost to the thousandth exactly 20% more consumption compared to the data displayed in the bc. how are your experiences? I prefer that it consumes more than too little (should be harmful.) mfg