1990 Evinrude 70 hp dies - hard to start

[genedavies]

I will be going along 80% power and the motor will die at 1.5 mile along route. Try starting it - hard to start - will start after cranking 15 - 20 minutes. Go along about 20/25% power will die, then start and die. Changed the fuel filter and plugs. Dies like you turn the key off, no warning. <br />1990 VRO Evinrude 70 hp dies - hard to start

 

[JB]

Re: 1990 Evinrude 70 hp dies - hard to start

Hi, Gene.<br /><br />Did you try pumping your primer bulb? Have you checked the venting on the fuel tank and the fuel pickup?<br /><br />1.5 miles sounds like just about the time required to suck a vacuum in an unvented tank.<br /><br />Let us know what you find.

 

[genedavies]

Re: 1990 Evinrude 70 hp dies - hard to start

I have a 24 foot pontoon with a inboard gas tank. I have changed the line and it seems to be pumping up OK. I put a new fuel filter on it (clear) and I can see gas. How can I check any kind of fire? (New plugs)

 

[Paul B]

Re: 1990 Evinrude 70 hp dies - hard to start

I HAVE THE SAME PROBLEM TRYED EVERYTHING CHECKED OUT CARBS, FILTER PLUGS YOU NAME STILL HAVE SAME. LET ME KNOW WHAT YOU FIND OUT i'LL DO THE SAME.

 

[JB]

Re: 1990 Evinrude 70 hp dies - hard to start

Hi Gene. <br /><br />Let me try again.<br /><br />Did you try pumping the primer bulb while the engine was misbehaving?<br /><br />Did you verify that the fuel tank is properly vented?

 

[genedavies]

Re: 1990 Evinrude 70 hp dies - hard to start

Yes, my wife was pumping on the fuel line. There is fuel in the fuel filter.

 

[JB]

Re: 1990 Evinrude 70 hp dies - hard to start

Hi, Gene.<br /><br />Okay, let's assume that there is nothing preventing fuel from getting to the fuel pump. Though there is still the possibility that there is a pinch in the fuel line somewhere.<br /><br />It is very unlikely that a problem occurs in three carbs at the same time, so that leaves the fuel pump. Pull the output line from the fuel pump and see that it squirts fuel into a bottle when turned over. Do this only after running the equivalenbt of about 1.5 miles undwer load.<br /><br />If there is any difficulty with this, loosen the fuel cap on the tank and try again.<br /><br />Let us know what you find.

 

[X7JAY7X]

Re: 1990 Evinrude 70 hp dies - hard to start

I had an older motor do the same thing, it would spontaneously cut out and then start a few minutes or several minutes later. It turned out to be a bad AMPLIFIER for the ignition system. When it got hot it would cut out, when it cooled off it worked fine. I dont know if you have one of these but I would eliminate a fuel problem before venturing to other things.

 

[genedavies]

Re: 1990 Evinrude 70 hp dies - hard to start

What type of electrical checks can I do? It seams like you just turn the key off. (I will not be able to do any work on it till Friday.)

 

[genedavies]

Re: 1990 Evinrude 70 hp dies - hard to start

OK, got to the lake this am. I changed the plugs again. I took out, the new Autolites 2634 and put in Champion L77JC4. it had Champion in it last year. At the first of this year I put the Autolites in it before ever using it. Well I hook up the garden hose to it and after a litlle cranking it started up, I let it run for about 5 minutes changing the rpm's alittle. Ran fine. Does not seam to have very much fuel in the fuel filter (clear filter), I pump it up and it does not change the way it runs, the filter fills up and then just has a little fuel in it, but keeps running fine. Inboard gas tank, screens (two about 3/8 in dia)on external port for the vent look fine and open.

 

[genedavies]

Re: 1990 Evinrude 70 hp dies - hard to start

Just had it running 35 minutes with no problems. I put some Marvel Mystery oil in a 5 gal can and pre-mixed it. Filled up the inboard gas tank. Keep changing the RPM's.

 

[genedavies]

Re: 1990 Evinrude 70 hp dies - hard to start

OK guys - I changed over to a 9 gal external gas tank. With the GPS running I went along .8 miles and it died. Started it and went along and died. Found out that if I went full out it went farther but runs rough. If I let it set about 15 minutes it will run at 50-70% fine for a while then start running rough like a plug it missing.

 

[genedavies]

Re: 1990 Evinrude 70 hp dies - hard to start

Had a boat shop look at it - said number 2 cyl had 10 pounds compression. Still do not understand why it would run good for a while then just die.