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ContinuousWave: Whaler Repairs/Mods
evinrude surges etc
|Author||Topic: evinrude surges etc|
posted 07-22-2002 07:37 AM ET (US)
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.
posted 07-22-2002 10:47 AM ET (US)
sounds like a fuel starvation problem open the tank filler cap and see if it runs smoothly,,,
posted 07-22-2002 09:16 PM ET (US)
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??
posted 07-22-2002 09:56 PM ET (US)
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).
posted 07-23-2002 10:53 AM ET (US)
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.
posted 07-26-2002 04:10 PM ET (US)
Sorry I was wrong...it'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.
posted 07-26-2002 04:22 PM ET (US)
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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