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Author Topic:   1983 Evinrude 35-HP Stalls At Idle Speed

RunnerDix posted 06-23-2009 08:55 AM ET (US)
I recently rebuilt the carburetor on my 1983 35-HP Evinrude with a rebuild kit. However, I'm still having trouble with the idling. I can't get it to idle without stalling out. It runs fine once I get it in gear but I have to run the idle very high for it not to stall. I can also keep it from stalling if I continually prime the primer bulb in the gas line (It seems to not draw in gas from the tank). It's got brand new 93-octane gasoline. [Give me] suggestions to keep the engine running at a low idle. I've got it on the back of my 1971 Boston Whaler SPORT. Thanks.
seahorse posted 06-23-2009 09:15 AM ET (US)

quote:
I can also keep it from stalling if I continually prime the primer bulb in the gas line (It seems to not draw in gas from the tank)
Sounds like a weak fuel pump or an air leak in the fuel lines, possibly from the quick-disconnect fittings.
Tohsgib posted 06-23-2009 01:38 PM ET (US)
Yup
skred posted 06-25-2009 07:12 PM ET (US)
Also, your engine is designed for 85-87 octaine, not 93. 93 octane is slower igniting, and slower burning to prevent ping in high-compression engines. Could be a factor in that the fuel is slow-burning and slow to ignite.
jimh posted 06-25-2009 10:18 PM ET (US)
It sounds like the problem with poor running at idle is related to lack of fuel. Check the fuel pump, fuel hoses, primer bulb, and fuel tank for any restrictions or leaks.
RunnerDix posted 06-26-2009 09:25 AM ET (US)
Thanks for the suggestions.. I will check out all the fuel lines and pump this weekend...
Ed Z posted 06-27-2009 01:38 PM ET (US)

When you rebuilt the carb, did you totally disassemble it and use a good carb cleaner in all the tiny orifices.??? Also are you certain the float level is set correctly... And lastly, make sure the small round gasket for the fuel pickup tube (in carb) has not been forgotten or become misaligned while putting the float bowl back on...
If al the above check out, then consider a fuel pump rebuild kit (rather inexpensive)... Also consider replacing all the fuel hoses in the engine area...

If the external fuel fittings (quick disconnects) are rather old, then replacing them may prove well worth it too...
RunnerDix posted 06-29-2009 10:07 AM ET (US)
We'll took it out for some sea trials this weekend and.. It run's great at low speeds and idles great. However, when I'm cruising at high speeds its stalls on me unless I continually squeeze the fuel line bulb. I replaced the fuel line from the tank to the engine which came with brand new connections. When I rebuilt the carburetor I did clean it thoroughly with carb cleaner. How would one adjust the float? My next thoughts were to buy a fuel rebuild kit. Can someone explain how this fuel pump works? Also would adjusting the needle adjustment help at all at high speeds? I dialed it in to idle great. Thanks for all the help so far. I feel like I'm getting close.
Tohsgib posted 06-29-2009 12:47 PM ET (US)
No need for a kit.
Unless you adjusted the float I highly doubt that. Sounds like a fuel pump or new diaphram. Remove screw and check diaphram for holes.
goldstem posted 06-30-2009 10:29 AM ET (US)
sounds like the fuel pump to me too. happened on my 35 as well. everytime I've tried to rebuild a fuel pump I fail. can't figure it out, some mental block. but a new pump (abour $45) fixes it right up.
Yiddil posted 07-01-2009 11:12 PM ET (US)
Boy does this all sound familiar...I'd listen to Ed's advice, he saved my you know what recently with my fuel delivery system problems and also got the 81 Evinrude seahorse running like top on my 13....I actually understand whats being said finally:) hehe Good Luck, Henry
RunnerDix posted 07-09-2009 08:42 AM ET (US)
Well I took apart the fuel pump and the diaphram looks pretty ragged. I could not identify any obvious holes but it does look pretty beat up. I've ordered a fuel rebuild kit and will install before this weekend and try again. What do you think could the replacement of a new diaphram help with my fuel delivery problems at high speeds? Thanks for the continued help.
Tohsgib posted 07-09-2009 11:29 AM ET (US)
Should be fine.
RunnerDix posted 08-20-2009 10:06 AM ET (US)
I got the fuel rebuilt kit which included a new diaphram and put everything together and no luck. I'm still having the same problem (stalling when anything above an idle). So at this point I have new gas, rebuilt the carb, rebuilt the fuel pump, new hoses, and also checked to make sure everything is air tight. I'm out of ideas. Does anyone have any suggestions at this point. Thanks
Tohsgib posted 08-20-2009 11:02 AM ET (US)
Compression OK?
Raise the idle?
tedious posted 08-20-2009 11:16 AM ET (US)
Does it continue to work OK when you squeeze the fuel bulb?
If so, then you know the problem must be outside of the motor - in the fuel bulb itself or farther upstream. See if you can borrow a tank and fuel line setup from another boat and give it a try.
Tim
Peter posted 08-20-2009 11:21 AM ET (US)
What brand of fuel hose and bulb are you using. If Tempo, get rid of it. Go OEM.
ketchum posted 08-21-2009 01:36 PM ET (US)
I had my 1984 evinrude doing close to the same thing. Started fine, go to accelerate and then it would shake, cough and stall. Ended up being the powerpack. Previous to that I replaced a coil (no spark in only one cylinder?). Thought for sure that was it. Replaced fuel pump. Changed out gas thinking maybe a water issue. I finally gave in and went to a dealer. It was the powerpack.

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Author	Topic: 1983 Evinrude 35-HP Stalls At Idle Speed
RunnerDix	posted 06-23-2009 08:55 AM ET (US) I recently rebuilt the carburetor on my 1983 35-HP Evinrude with a rebuild kit. However, I'm still having trouble with the idling. I can't get it to idle without stalling out. It runs fine once I get it in gear but I have to run the idle very high for it not to stall. I can also keep it from stalling if I continually prime the primer bulb in the gas line (It seems to not draw in gas from the tank). It's got brand new 93-octane gasoline. [Give me] suggestions to keep the engine running at a low idle. I've got it on the back of my 1971 Boston Whaler SPORT. Thanks.
seahorse	posted 06-23-2009 09:15 AM ET (US) quote: I can also keep it from stalling if I continually prime the primer bulb in the gas line (It seems to not draw in gas from the tank) Sounds like a weak fuel pump or an air leak in the fuel lines, possibly from the quick-disconnect fittings.
Tohsgib	posted 06-23-2009 01:38 PM ET (US) Yup
skred	posted 06-25-2009 07:12 PM ET (US) Also, your engine is designed for 85-87 octaine, not 93. 93 octane is slower igniting, and slower burning to prevent ping in high-compression engines. Could be a factor in that the fuel is slow-burning and slow to ignite.
jimh	posted 06-25-2009 10:18 PM ET (US) It sounds like the problem with poor running at idle is related to lack of fuel. Check the fuel pump, fuel hoses, primer bulb, and fuel tank for any restrictions or leaks.
RunnerDix	posted 06-26-2009 09:25 AM ET (US) Thanks for the suggestions.. I will check out all the fuel lines and pump this weekend...
Ed Z	posted 06-27-2009 01:38 PM ET (US) When you rebuilt the carb, did you totally disassemble it and use a good carb cleaner in all the tiny orifices.??? Also are you certain the float level is set correctly... And lastly, make sure the small round gasket for the fuel pickup tube (in carb) has not been forgotten or become misaligned while putting the float bowl back on... If al the above check out, then consider a fuel pump rebuild kit (rather inexpensive)... Also consider replacing all the fuel hoses in the engine area... If the external fuel fittings (quick disconnects) are rather old, then replacing them may prove well worth it too...
RunnerDix	posted 06-29-2009 10:07 AM ET (US) We'll took it out for some sea trials this weekend and.. It run's great at low speeds and idles great. However, when I'm cruising at high speeds its stalls on me unless I continually squeeze the fuel line bulb. I replaced the fuel line from the tank to the engine which came with brand new connections. When I rebuilt the carburetor I did clean it thoroughly with carb cleaner. How would one adjust the float? My next thoughts were to buy a fuel rebuild kit. Can someone explain how this fuel pump works? Also would adjusting the needle adjustment help at all at high speeds? I dialed it in to idle great. Thanks for all the help so far. I feel like I'm getting close.
Tohsgib	posted 06-29-2009 12:47 PM ET (US) No need for a kit. Unless you adjusted the float I highly doubt that. Sounds like a fuel pump or new diaphram. Remove screw and check diaphram for holes.
goldstem	posted 06-30-2009 10:29 AM ET (US) sounds like the fuel pump to me too. happened on my 35 as well. everytime I've tried to rebuild a fuel pump I fail. can't figure it out, some mental block. but a new pump (abour $45) fixes it right up.
Yiddil	posted 07-01-2009 11:12 PM ET (US) Boy does this all sound familiar...I'd listen to Ed's advice, he saved my you know what recently with my fuel delivery system problems and also got the 81 Evinrude seahorse running like top on my 13....I actually understand whats being said finally:) hehe Good Luck, Henry
RunnerDix	posted 07-09-2009 08:42 AM ET (US) Well I took apart the fuel pump and the diaphram looks pretty ragged. I could not identify any obvious holes but it does look pretty beat up. I've ordered a fuel rebuild kit and will install before this weekend and try again. What do you think could the replacement of a new diaphram help with my fuel delivery problems at high speeds? Thanks for the continued help.
Tohsgib	posted 07-09-2009 11:29 AM ET (US) Should be fine.
RunnerDix	posted 08-20-2009 10:06 AM ET (US) I got the fuel rebuilt kit which included a new diaphram and put everything together and no luck. I'm still having the same problem (stalling when anything above an idle). So at this point I have new gas, rebuilt the carb, rebuilt the fuel pump, new hoses, and also checked to make sure everything is air tight. I'm out of ideas. Does anyone have any suggestions at this point. Thanks
Tohsgib	posted 08-20-2009 11:02 AM ET (US) Compression OK? Raise the idle?
tedious	posted 08-20-2009 11:16 AM ET (US) Does it continue to work OK when you squeeze the fuel bulb? If so, then you know the problem must be outside of the motor - in the fuel bulb itself or farther upstream. See if you can borrow a tank and fuel line setup from another boat and give it a try. Tim
Peter	posted 08-20-2009 11:21 AM ET (US) What brand of fuel hose and bulb are you using. If Tempo, get rid of it. Go OEM.
ketchum	posted 08-21-2009 01:36 PM ET (US) I had my 1984 evinrude doing close to the same thing. Started fine, go to accelerate and then it would shake, cough and stall. Ended up being the powerpack. Previous to that I replaced a coil (no spark in only one cylinder?). Thought for sure that was it. Replaced fuel pump. Changed out gas thinking maybe a water issue. I finally gave in and went to a dealer. It was the powerpack.