with reference to the figures of the drawings , and in particular to the diagram of fig3 the method for the collection of gassy residues in refuelling plants and in fuel tanks includes the following phases . the fuel dispensing , for example , might be a refuelling of a motor vehicle at a fuel filling station , or by the filling - up of a tanker truck at a refinery or fuel storage plant , or by the unloading of fuel from a tanker truck into a fuel filling station . the reference made above to the dispensing phase refers specifically to any operations connected with the dispensing of the fuel , including the collection of gassy residues contained in a fixed or mobile tank used for containing fuel . in fig3 block 1 represents the &# 34 ; source &# 34 ; of dispensing while block 2 indicates the &# 34 ; destination &# 34 ; of the fuel and e represents a possible dispensing path . the phase indicated using the letter p involves the removal of the gassy residues of the fuel , which can be performed at the same time as the filling operation , as in the case of a motor vehicle in a filling station , or can be carried out subsequently , as in the case of gassy residues from a fixed or mobile tank . the subsequent phase involves condensing , using special means represented by block 3 , the gassy residues up until they pass into the liquid state . condensation can be performed , as mentioned above , in various ways . one possible procedure is to cool the gassy residues by means of a refrigeration unit , up until a liquid is obtained . the liquid obtained thus is then reintroduced into the fuel dispensing circuit ( by sending same to source 1 ), as shown by path r of fig1 or , as indicated by arrow r &# 39 ; ( in a broken line ) sent to a special collection tank 4 ( also shown in a broken line ). in the specific case of fuel distributors , illustrated in fig1 and 2 , the method can include introduction of the liquid obtained ( which is the same as the fuel dispensed from the distributor ) into the fuel supply circuit at the supply pump . fig1 and 2 are a schematic representation of a fuel distributor 10 . the distributor 10 is provided with at least one dispensing pistol 11 , for connecting with a mouth 17 of a car 13 fuel tank 12 . the dispensing pistol 11 is situated at the free end of a double - conduit pipe 14 . one of the two conduits in the pipe 14 , the one indicated by 16 in fig1 which is coaxial to and external of the other conduit 15 , dispenses the fuel in a direction indicated by e . the remaining conduit 15 connects an end 20 of the pipe 14 , which end 20 is sealedly associable to the mouth 17 , to an aspiration pump 21 . the fuel contained in a tank 22 is sent by a supply pump 23 ( in direction e ) along the conduit 16 of the pipe 14 to fill the fuel tank 12 . the gassy residues denoted by 19 , which fill the tank 12 area remaining above the fuel level 18 , are aspirated along the communication holes 15 and sent by the pump 21 in direction p , towards the means for condensing 3 . the liquid obtained by action of the means for condensing 3 can be sent to a collection tank 4 ( along the path r &# 39 ;, the tank 4 and path r &# 39 ; being represented in broken lines in fig1 ) or reintroduced into the fuel supply circuit , at the supply pump 23 , for example by means of a conduit 24 . the conduit 24 , which represents the means for connecting the means for condensing 3 to the fuel supply pump 23 , can be associated to an air separator chamber 25 of the supply pump 23 with a single - acting valve 26 connected to the discharge pipe 27 of the separator chamber 25 , as illustrated in fig2 . the apparatus can be associated , with a connection represented by 28 in a broken line in fig2 to the control panel 29 of the fuel distributor 10 . in this way , at least the aspiration pump 23 and the means for condensing 3 are activatable by activation of the dispensing pistol 11 . the means for condensing 3 can advantageously be arranged in a zone above the distributor 10 , so as to enable the liquid obtained to drop into the supply pump 23 . in the case of gassy residue collection in a fixed or mobile tank ( such as for example in cases concerning tanker truck - filling station tank or refinery - tanker truck transfer ), the apparatus will comprise at least : an aspiration pump for the gassy residues connected to a tank access aperture ; means for condensing the gassy residues , producing a liquid and means for associating the liquid thus obtained with a collection tank . the invention has been described with reference to several preferred embodiments . obviously , alterations and modifications will occur to others upon a reading and understanding of this specification . it is intended to include all such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof .