bout fuel conssuming

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antonio88

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May 23, 2013
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ive been asking quater bit of questions lately cuz im trying not to be stuck in the middle of the lake with a non running motor i guess thay everybody goal, well i had my 1978 evinrude 85 hp running on my yard with a 5 gallon tank and a nice 50 to 1 mix so it only last like 30 min or lil bit less just on idle and my question is that normal i think is wasting a lot of fuel i mean how much tome should it last me running on idle
 
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coolbri70

coolbri70

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Re: bout fuel conssuming

sounds excessive to me, at idle, it should burn around 8 or 9 gallons per hour at wot. with my 85 hp rude towing a boat 8 miles took about an hour and burned 6 gallons at displacement speed
 
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A

antonio88

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Re: bout fuel conssuming

also theres a lot of sludge coming out of the exhaust they told me thats normal but i think is excessive also but im not sure
 
coolbri70

coolbri70

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Re: bout fuel conssuming

the carburetor is dumping to much fuel in the motor
 
tazrig

tazrig

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Re: bout fuel conssuming

Here is a link to section 4 page 8 of your manual:

http://boatinfo.no/lib/evinrude/manuals/1973-1991johnsonevinrude.html#/92

It goes over a couple of things on the right hand page about half way down that you can try to correct your problem. Unfortunately you don't have adjustable jet screws on the outside of your carb. that would make it much easier to troubleshoot.
 
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antonio88

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Re: bout fuel conssuming

yeah is the same thing that i found and it didnt help so!!!!!!!!!!!!
 
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antonio88

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Re: bout fuel conssuming

so im reading thought the service manual and says that if theres a tiny pin hole diaphragm such hole will let pass fuel into the crank case and wet foul the spark plugs and also i have that on my spark plugs, so that tiny pin hole can be the cause of my excessive fuel conssuption
and excessive sludge?
 
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pro-crastinator

pro-crastinator

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Re: bout fuel conssuming

I'm no expert here but I have a question.
Whats the name of that needle valve that is connected to the float?
If the float is not "set" right (90 deg) wont excessive fuel get dumped into the carb throat?

AND if you have extra fuel gettin dumped (extra oil), wont that get gunky (technical term I heard on TV) in the exhaust ports?
And didn't Antonio say he rebuilt the carb?

I'm just sayin..
 
tazrig

tazrig

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Re: bout fuel conssuming

Clearly the engine is running way richer than it should. About the only 2 other things I can think of is to check and see if the choke plate is sticking partially closed. If it is hit the linkage with some wd-40 or the like to loosen it up. If it is still sticking you might find a spring in the linkage itself that is stretched out and needs to be tightened or replaced. The other thing you might try is rebuilding it again. Sometimes even the pro's have to do it more than once to get just right. If you take that route try to find OEM parts for it if you can.
 
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Mohawkmtrs

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Re: bout fuel conssuming

...and don't forget what racerone said about the fuel pump diaphram.
 
A

antonio88

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May 23, 2013
Messages
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Re: bout fuel conssuming

i just took the fuel pump apart to check the diaphramg anf is have cracks all around it
 
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