1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Manual, Page 84Get this manual
Fuel Tank Testing Omitting the tank pressure test may result in returning fuel system to service which could leak liquid or vaporized fuelIgnition of this leakage could result in fire or explosion ill
Whenever fuel tank or line has 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 testas leakage or fumes may occur only when the tank's 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
'4l Tools needed are Stevens Gearcase Pressure Tester Model S34 and OMC Fuel Tank Pressure Test Adapter PI 389945 compressed air supply is also needed
Do not smoke during test or perform test in area where there are sparks or open flamesOnce air pressure is applied to tank, gasoline traces may be expelled as vapor or mistGasoline in these forms is extremely flammable and highly explosive