Mysterious shutdown

N

nymack66

God
I took the V out in real choppy waters this weekend (small craft advisory was in effect) .
It was indeed a pleasure watching the V slice through the waves and tasting the salt of the ocean, I stress the crap on the Arjay transom no leaks no problem.
During my run the engine, Evinrude 1987 140 looper just shutoff at 5500 RPM, the primer bulb was hard as a rock and the engine started right back up no problem.
On a run previously the RPM seems to drop to 4500 then jump back to 5500 then all seems well there after, now this weekend it rear its ugly head again.
Do I have a problem brewing like a bad pack or something ?
My fuel sender was acting up the new gauge rocking back and forth, I replaced it and lubricated all connectors with electrical grease and corrosion inhibitor, thinking may be a bad ground or something..
Any ideas ?
 
From what you describe I would suspect the fuel pump. I had one before that the servo in it would stick all the way over and block the fuel off. And it would restart everytime, put it under load and it would bog down and sometimes shut off.
 
Guys,
Thanks for all your ideas, I am now re-thinking the whole issue.
I was hell bent on thinking its the Pack, in a previous post of mine I mentioned the fact I turn the new tank backwards and install it during the re-build.
One of my initial fear in doing this was the fact it possibly can block my vent when my bow is up on a semi plane.
This is exactly the position of the boat when the shutoff happed this weekend.
In this photo the tank was in the correct way but my feeder tube to the engine was towards the front and I was concerned the opposite will happen, my engine will not siphon fuel from a half full tank when the bow is way up.
So I went with the idea of turning the tank around.
This weekend I will take her out and test by holding the bow up for an extended period and see what happens, my tank is ¾ full currently.
I will also note when I ran boat previously I had approx ¼ fuel and any given time, it was only this weekend I fill her up to around ¾ when this issue showed up.
If ventilation is indeed the issue I will install an additional vent to the front of the tank.
I will post my findings..
DSCF0029.jpg
 
nymack66 said:
I took the V out in real choppy waters this weekend (small craft advisory was in effect) .
It was indeed a pleasure watching the V slice through the waves and tasting the salt of the ocean, I stress the crap on the Arjay transom no leaks no problem.
During my run the engine, Evinrude 1987 140 looper just shutoff at 5500 RPM, the primer bulb was hard as a rock and the engine started right back up no problem.
On a run previously the RPM seems to drop to 4500 then jump back to 5500 then all seems well there after, now this weekend it rear its ugly head again.
Do I have a problem brewing like a bad pack or something ?
My fuel sender was acting up the new gauge rocking back and forth, I replaced it and lubricated all connectors with electrical grease and corrosion inhibitor, thinking may be a bad ground or something..
Any ideas ?
Click to expand...

Check the ignition ground on the back of the cylinder heads. Each of my 140 loopers did the exact thing you mention and by luck I found an ignition wire ground corroded inside the crimp connector. It pulled away when touched and was making intermittent contact. Before it shut the motor down it had apparently interrupted the ignition momentarily on the previous trip. I love the 15cent solutions....doesn't happen that often.
 
72,
I will take your tip into consideration also, I have brand new wires throughout this set-up you name it and its new down to the key switch, but still I am not ruling out an electrical problem just yet,however his fuel tank had me worried about this vent issue from day one.
Thanks
 
if it acts up again, just loosen the fill cap and try again, that should tell you if its the vent. If it runs good with teh fill loose, tighten it back up and see if the problem returns
 
Update

I took the Boat out today and ran the crap out of it , Happy to report its a fuel issue, As long as I kept the bow down it was ok half way up on a plane the primer all goes flat! I will have to insert an new vent hook up on the front of the tank.
I will post pictures when this is done , for now the tank is below 1/2 as long as I punch it up on a plane it runs just fine 5300 rpm right on.
Its amazing if I held it on 3000 rpm with the bow up the bad boy shuts off completely starts right back up.
I now remember this was exactly my initial thought as I flip the tank around.
 
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