1987 Johnson/Evinrude CU Outboards 35A thru 55 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 test, as 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 transportTools needed are Stevens Gearcase Pressure Tester Model S34 and OMC Fuel Tank Pressure Test Adapter PIN 389945 compressed air supply is also needed
ill there are sparks or open flamesOnce air pressure is