Air pump or fuel pump?

Question

i have a 1978 or 79 evinrude 85hp outboard serial number i dont know. does this motor have a fuel pump that sucks the fuel into the motor or does it pump air into the gas can which forces the gas to the motor? one metal gas can i have i put a gallon of gas and oil mixture in it to start my motor, about an half an hour after i shut the motor off it had oil around the gauge. the can is probably not sealed any more around the gauge since it is 30 years old, but would this mean its an air pump?

Answer 1

Yours is not a pressurized tank in 78.

The pressurized tank is from the sixty's.

The pressurized tank had two lines running to it.

One line was the vapour line from the crankcase and the other fed the fuel up to the carb.

If you have only one line from the tank it is the newer suction style which has a fuel pump on the side of the engine.

Answer 2

It's been awhile since I fixed boat motors . You have a bulb in the fuel line I think don't you ? When you pump the bulb it simply pumps fuel to the fuel pump , follow the line from the bulb and it ends at the pump I believe , the pump is probably actuated by crank case air pressure pulses , which in turn is translated into a pumping action that makes the fuel flow to the carbs . the fuel tank is not pressureized , that could lead to uncontrolled fuel flow if a hose broke , it is sucked out just like a coke and a straw , then blown out your nose to the carbs .

Answer 3

If you're running oil and gas mix, no fuel pump, 2 cycle, no pump.