… When the needle valve in the carburettor float chamber closes, the fuel passes via the return
line back to the tank. A restrictor is fitted in the return to prevent too much fuel bypassing the …

… motor vehicles because the needle valve A would be opened … counterweight levers for closing
the needle valve. It is very im-,… The carburetor works best with air at about 80F. so that the …

… variety of carburetors and/ or fuel systems. The correct initial selec tion of the basic carburetor
type … With this information, a systematic approach to the selection of carburetor type can be …

… The lower end of the piston rod carries a tapered needle valve penetrating the centre of
the petrol jet (IT). A tubular connection (SO) is formed between the upper portion of the jet …

… to simulate the fuel in the carburettor bowl), and about 30 ml of fuel is drawn into a glass
syringe fitted with a typical carburettor needle valve. The needle valve is normally kept shut by a …

… It may be noted here that the needle valve in the float chamber was so set that a slight raising
of the petrol level led to flooding. The petrol was seen to lie in the top of the jet, although it …

… operation fills the carburettor bowl. The raised float closes the fuel entrance of the carburettor.
The pressure … This should be selected in conjunction with the carburettor needle valve. …

… needle valve housing, and extract it from the carburettor upper body (see illustration). Collect
the washer from the threads of the needle valve … 9 Fit a new washer over the needle valve …

… by the main jet alld adjusted IJy an adive needle valve, the quanti ty of alcohOl fuel or … needle
valve has been used to control the float chember ( I :' and the float ch..ber (II) of a carburetor …

… the carburettor in a reasonable time. (b) It must present the fuel tothe carburettor needle valve
… as much as the carburettor requires, so that when the needle valve closes the pump must …