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Author Topic:   evinrude surges etc
simonmeridew posted 07-22-2002 07:37 AM ET (US)   Profile for simonmeridew   Send Email to simonmeridew  
My friend has a 15 foot whaler with an older, maybe 80's model 65 hp twin evinrude.
It starts fine from cold, runs fine at cruising speed for maybe 1/2 mile, then starts loosing rpm's, and starts surging, maybe at a rate of one surge per second. At this point it doesn't seem even to idle well. We tried changing plugs, same thing happened.
Can we spray something into the carbs when it starts surging to see if problem is fuel related? Probably won't happen when in the driveway on the muffs, tho not sure.
JohnAz posted 07-22-2002 10:47 AM ET (US)     Profile for JohnAz  Send Email to JohnAz     
sounds like a fuel starvation problem open the tank filler cap and see if it runs smoothly,,,
simonmeridew posted 07-22-2002 09:16 PM ET (US)     Profile for simonmeridew  Send Email to simonmeridew     
We didn't try the air vent on the gas tank (portable 6 gal) but I can say the bulb was hard as a rock. BTW, it's an '84 'rude.
Anybody else have any ideas??
acassidy posted 07-22-2002 09:56 PM ET (US)     Profile for acassidy  Send Email to acassidy     
Johnaz I think is on the mark. Sounds like a fuel problem. Motor is not getting as much fuel as it needs causing it to surge as you say. Check cap vent on tank, hose for restrictions, bad valves in bulb primer, plugged filter. Do this before you check fuel pump and think of rebuilding the carbs (which might be the problem).
Bigshot posted 07-23-2002 10:53 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Fuel vent, fuel pump(diaphram), air leak in gas line. Water in tank.

Last year Evinrude made a 65 was 1974. Unless it is a commercial engine.

simonmeridew posted 07-26-2002 04:10 PM ET (US)     Profile for simonmeridew  Send Email to simonmeridew     
Sorry I was's a 60hp(not 65) Evinrude, '84 etc. We are currently ready to do a fuel tank exchange to eliminate bulb, fuel line issues. Do the easy thing first.
whaleryo posted 07-26-2002 04:22 PM ET (US)     Profile for whaleryo  Send Email to whaleryo     
Had a similar sounding problem many years ago. Turned out to be a few small chunks of rusted metal in the fuel line. The pieces of metal wouldn't cause any problems unless the the fuel flow was sufficient to overcome the inertia. Then the engine would slow and surge intermittently. My suggestion is to check your fuel path from start to end.


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