1991 Johnson/Evinrude EI Outboards 2.3 thru 8 Service Manual, Page 68Get this manual
Testing
ill fuel system to service which could leak liquid or vaporized
fueL Ignition of this leakage could result in fire or explosion
Omitting the tank pressure test may result in returning a
Whenever fuel tank or line as been serviced or has had parts disassembled, the unit must be tested to ensure that the repaired or reassembled portion will not leak or emit fumesSimply adding fuel to the tank and checking for leakage is not an adequate test, as leakage or fumes may occur only when the tanks contents have been pressurizedAs examples, pressurization can occur when the tank is left in sunlight, or when the fuel is agitated, as might occur during transport(';11,1 Tools needed are an air pressure gauge
and OMC Fuel Tank Pressure Test Adapter PIN 389945 Do not attempt to remove screw from test adapterA compressed air supply is also needed
to tank, gasoline traces may be expelled as vapor or mistGasoline in these forms is extremely flammable and highly explosive1Remove fuel cap and disengage from tankEmpty fuel tank completelyINot Ilf any fuel remains in the tank during testing, it could