Evinrude die out

[r4983]

Greetings to all,<br />I have a 1988 Evinrude 48 hp outboard that has been setting for two years. Started it up the other day and it ran great at low throttle and half speed. But when I went to full throttle after about 30 seconds to a minute it acted just like it ran out of gas.<br />once it stopped I was able to restart right away. At low throttle or half speed would run great, but as soon as I went to full throttle engine would die in 30 seconds to a minute.<br />While I had the wife drive I noticed the priming bulb would collapse. As soon as the bulb collapsed the engine would die out.<br />What should I be looking for to solve this problem<br />Thanks ahead of time for your help<br />Richard Davis

 

[macojoe]

Re: Evinrude die out

I had this happen to me once before the problem was the fule tank was not vented. good luck

 

[dmessy]

Re: Evinrude die out

Yeah , sounds like a fuel line obstruction somewhere. You prime it with the bulb to get it running then the fuel pump takes over. The engine vacumn is collapsing the bulb. 2 years of setting... ,may be time for a bulb replacement also.

 

[rickdb1boat]

Re: Evinrude die out

Sounds like a Carb. rebuild is in order, after sitting for 2 Years. Could be gummed up jets!

 

[DJ]

Re: Evinrude die out

r4983,<br /><br />If the bulb collapses you have a restriction issue.<br /><br />Two places to look.<br /><br />1. The fuel tank vent line may be clogged. Critters love to crawl up these things.<br /><br />2. There is "anti-siphon" valve on the engine feed line from the tank. You can remove it TEMPORARILY to see if that is the problem. If it is, replace it, it is necessary for safety reasons.

 

[DB.Beachum]

Re: Evinrude die out

More than likely it is the carb,the carb has three circuts ,idle ,midrange and high speed ,the high speed jet goes the deepest in the float bowl and is usually the first thing that gets varnished up,it may idle good ,it may go to midrange ok,but when you go WOT it does run out of gas,evinrude carbs are the easist to rebuild and usually the cheapest carb kits around 18.00 for a complete OEM kit per carb,you have to remember when fuel goes to a solid state it never goes back to liquid state,the solid stuff starts to block off the jets and the motor runs out of enough fuel to operate,you have to be careful especailly with larger motors it can cause a high speed lean-out(to much air not enough fuel) condition that can overheat cylinders burning pistons and rings,there is nothing you can put in the fuel to fix these conditions you must rebuild the carb,always use a carb kit that has a new float,varnish builds up on the float weights it down cause it to be not as buoyant,so times it does not float at all cause the carb to overflow with fuel,

 

[Beaux]

Re: Evinrude die out

mac and Djohns have it right.....<br />The issue isnt gas flow through the carb jets. The crankcase creates negative pressure and pulls fuel thru the carb jets. Since your bulb is going flat, gas is definitely flowing thru carbs and there must be restriction of vent on fuel cap or restriction in fuel line between bulb and tank(either very likely) or it could be a bad antisiphon valve which would cause the same thing. To understand it, think of the "milk jug chug". If you make a good seal around top and chug, at first you get a lot of milk, then you notice that the jug starts collapsing and you have to really create a lot of force to get any milk to flow after a while (Jug has no venting available for pressure you are creating). The same thing is happening in your fuel system. Try it out , and good luck

 

[Beaux]

Re: Evinrude die out

I used milk instead of beer to be politically correct.... The beer example works best because a solution to the problem can be demonstrated. Cutting hole on side of can (to allow venting) is why someone can shotgun a beer so much faster then you can chug it normally!!!

 

[rickdb1boat]

Re: Evinrude die out

As the rest said,<br />Replace bulb AND fuel line, with new fittings<br />Remove anti-syphon Valve temporarily<br />Check Vent by leaving Gas cap loose and run it.

 

[Beaux]

Re: Evinrude die out

r4983-<br />let us know the results when you get a chance to work on it.

 

[r4983]

Re: Evinrude die out

Thank you all for your input. Milk may be more politically correct, but I like the beer example much better.<br />Of coruse that would have to be tried in a responsible manner

 

[DB.Beachum]

Re: Evinrude die out

For some reason I did not read the part about the squeeze buld collapsing,I would have to agree with the rest of the people on the page about there is a fuel restriction or not enough vent

 

[blue.monkey]

Re: Evinrude die out

A painless check would be to mix up a gallon or two of fuel in a can and stick the fuel line in the can and run at WOT.

 

[ob]

Re: Evinrude die out

r4983,After checking fuel tank vent,anti syphon valve,and bulb for restriction problem ,as suggested above,also clean and inspect pickup tube strainer in tank.