1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 100Get this manual
Fuel Pump Pressure Test100 and 155 Before testing, loosen fuel tank gas cap (6 gallon tank only) momentarily to release any pressure that may have built upFuel tank must not be more than 61 cm (24") below fuel pump1Remove the lower carburetor inlet hose pump
from the fuel
2Install tee (OMC Part No 319741) and hose Part No320949) as shown3Connect the lower carburetor hose