boaterjoe

I have a 1985 Evinrude 25HP. Yesterday we were heading out on the water and had engine trouble. We got it started and it died. Had to choke it to get it restarted.

Pulled it 3 times and it fired up. Went right up and revved up very high, which it has never done before. Then quit.

We tried to pull it for the next 5 minutes without even a bump. Tried choking, working the throttle back and forth, even waited for a few minutes before trying again, thinking it was flooded. Nothing!

What I did notice, I could not smell any fuel when I was choking it. It almost seems like it isn't getting any fuel.

Brought it home and took the cover off, tried to start it again, but still couldn't smell any fuel coming from the motor while I was trying to start it..

Anyone have any ideas where to start? I am thinking it is fuel issue but not sure, anyway I am bummed and so are the boys we can't get out and the weather has been pretty nice!

STORMER

Check vent on gas tank, use primer bulb to force fuel to carb (bad fuel pump?), drop the screw in bottom of carb fuel bowl see if there is fuel in carb, pull a spark plug see if you have spark

Mallard Creek

Fuel =1
Spark =2
and AIR=3

Need all three for combustion, check in that order.

Fuel, good quality clean gas. Not old, no water, good octane.

Spark, good looking plug, no rust on flywheel, boot is all the way on one both cylinders.

Air, is the choke butterfly all the way closed when choked, does it move freely with the throttle?

If equipped..........never forget to check the KILL SWITCH.

Regards,

DuckZone

Your situation sounds like the poor guys that came into Riverton yesterday morning early. Got started out then the noise stopped and all we heard was them trying to get the motor started. Good luck with your troubles.

__________________
Quote: This is just a hobby to pass the time. We are all self made millionaires that prefer the company of other smartas'd duck hunters like ourselves.

altrocker1

I'd start by checking the fuel pump out...if you have a nice stream of fuel coming out of it, then I'd move on to taking apart the carb. You can use a fine piece if wire to clean the jets

Delfate16

This is where I'd start as well. If the carb has a little piece of junk in it, could be blocking the fuel from coming in. A good cleaning will clear it out.

Cirruss11

Much very good advice from previous posters.

This is certainly a fuel issue. The symptoms are classic motor starved of fuel, then running lean, then not running at all.

I would first check that the fuel tank vent was open and even take off the cap to make sure. Pump the bulb till it tightens up, then try to start engine. If no go, try next thing.

Inspect the fuel hose and bulb for any cracks. If there are cracks, replace. Cracks can let in air into the fuel line. If enough air, it can vapor lock your fuel pump and cause it not to pump fuel until properly reprimed by pumping bulb.

Then check when pumping the bulb check that fuel actually flows out the hose. You will have to disconnect the hose from engine and depress the little spring loaded valve ball in the connector to see if fuel will flow. If no fuel flows, then you have a problem with the pickup within the tank or the bulb. If fuel flows, move on to the carburetor.

Plug fuel hose back to engine. Take off carb bowl or remove drain screw. Pump hose bulb and see if fuel comes out the carb bowl. If it flows, then your problem may be with the fuel pump or a plugged main jet in the carburetor. If it doesn't flow, you have an obstruction in the engine fuel line...maybe a plugged fuel filter. Or the carb float bowl valve is stuck closed.

Time to make some deductions. Good luck Sherlock!

__________________
Shoot the middle bird, aim for the head, double, then repeat.

SteveJ

I've had issues with the aftermarket fuel attachments on the end of the fuel lines. You know, the ones from the land of "almost right". Some have a sloppy fit and with a little tilting or
side to side motor movement they break suction even thought they look like their fastened.

DUCKHTR

Had a buddy at Leech this summer with the same situation. Tried all of the suggested things to check but nothing discovered the problem. Finally took engine to the dealer who checked the crankcase pressure and discovered that it was really high after the engine was run until it would die unless the bulb was pumped by hand. Pressure was high enough to prevent the fuel pump from functioning properly. Checked the crankcase vent and discovered that "mud-dobbers" had built a nest in the vent tube and completely blocked it causing the high pressure in the crankcase. Cleaned out the nest and the engine ran perfectly. None of us over the course of a week ever checked to see if the crankcase vent was plugged! Just one more thing to check. Good luck.