Evinrude 125hp (1971/72) quit on me while going along about 1/4 throttle... it just quit... had half tank of fuel left... Tried to restart, it ran for about 30 seconds, shut down, continues to do the same thing.
You don't say exactly what year that engine is... BUT... by "Older Model" I am assuming that it is either a 1971 or a 1972 model and have edited the quote above accordingly along with suggestions for that "older model" as follows..
To determine whether the problem is fuel or ignition:
At the end of those 30 seconds, if the fuel primer bulb has a tendency to go flat (draw inward somewhat), that indicates a fuel restriction between the bulb and the fuel supply. If this situation does not exist..........
First..... when the engine is running for those 30 seconds, constantly pump the fuel primer bulb, acting as a manual fuel pump. If the engine continues to run as long as you pump that bulb, that indicates the fuel pump has failed.
Second.... When the engine starts to die out, have the carburetor face plate removed and spray premix from a spray bottle directly into the carburetors. If that causes the engine to continue firing/running, that also indicates a lack of fuel getting to the cylinders... BUT... if neither of the above has any effect............
When the engine shuts down, check to see that you still have 12v going to the pulsepack at the terminal strip (purple wire). If 12v is present, remove spark plugs and test spark by having a tester with a air gap of 3/8" for the spark to jump. The spark should jump that gap with a strong blue lightning like flame... a real SNAP!
Let us know what you find.
