1983 Yamaha 30EN Outboards Service Manual, Page 33Get this manual
2 Fuel meter housing Thoroughly clean the strainer on the end of the suction pipe with suitable cleaning solvent and blow it dry with compressed air3Priming pump and fuel hoses Check the priming pump and fuel hoses for cracks or holes, and replace them, as requiredAlso, check the operation of the check valve by blowing in to it
Installation
Always use new gaskets to prevent fuel leakage past joints To prevent the fuel from leaking past the fuel hose joints, replace any fatigued fuel hose bands1Fuel meter assembly Place the gasket and lens cover on the outer side of the meter housing, and secure them with the screws
A1Check valve (inlet)