1990 Johnson Evinrude "ES" Colt/Junior thru 8 Service Manual, P/N 507870, Page 66Get this manual
4Point end of fuel hose into container below top of tankDepress the ball in the fuel connector until any remaining fuel is expelled 5Add air to bring pressure back to 10 psi (69 kPa)6Submerge fuel tank in water, one portion at time, in the same
manner you would check tire for air leaksAny air bubbles indicate leak point which must be repaired or replaced
submerged, check for leakage from fuel nipple and fuel valve pin Depress vent valve pin to check air vent disc valve for leakage
7Disconnect hose from tankWith fuel connector housing
f61 8After testing, release tank pressure through valve stem before removing capf61 INotel Do not attempt to remove screw from center of Test Adapter PIN 389945
Fuel TankColt, Junior
1Remove manual starter as described in Section 72Close fuel shut-off valveDisconnect fuel hose at the carburetor
Remove the two retainers attaching the fuel tank to the mounting bracketLift off the fuel tank