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Author Topic:   Evinrude 48 SPL problems

freediver111 posted 04-27-2006 10:43 PM ET (US)
I have an Evinrude 48 SPL mounted on my Boston Whaler boat, It's been a big headache this year. I had a mechanic service it last year and it ran perfectly for about six months. Compression test, sparks, electrical, impellor, etc...all good. This past year had me out to sea for several months at a stretch so I stored the engine properly and ran it with fuel stabilizer (STA-BIL, the red stuff). I get back from these long cruises and take my boat for a dive and the thing runs great until I hit choppy seas and it dies! Following seas are no problem but as soon as we start to pitch it sputters and dies. I've had to come in to the harbor using my 9.9 kicker. I get it home and clean the plugs, drain the carb and let it sit for a while and it starts right up. I decided it might be a carb issue so I rebuilt both carbs. Take it out the next day and as soon as I get into choppy seas it dies again. I left shortly after for three months. I get back and start her up on the first try. It's running great in my yard but I know that as soon as I get it into the ocean it's going to die.
I'm thinking it might be the fuel pump. I also run a water separator so I doubt water in the fuel is an issue.
Help me out!!!! I'm getting really frustrated with it and am almost to the point where I might sell it and save up for a 4 stroke. Don't want to dump the cash if all I have to do is get a new fuel pump.
Save my engine!!!!!!
Thanks
jimh posted 04-28-2006 01:16 AM ET (US)
A float is sticking. Next time it dies give a carburetor bowl a sharp rap with the handle of a screwdriver to unstick the float.
Clark Roberts posted 04-28-2006 05:52 AM ET (US)
Could be the float(s) as Jim mentions and also could be a loose ground connection on the electronics or a short due to some faulty insulation. Good luck and happy Whalin'.// Clark.. Spruce Creek Navy
minitauk85 posted 04-28-2006 06:16 AM ET (US)
It could also be debris in the fuel tank-k
freediver111 posted 04-28-2006 02:37 PM ET (US)
I thought it was a float problem as well but it still did it after my mechanic rebuilt the things! The next day in fact.
Not sure how to check the electrical short as you mentioned. How would I do that?
Thanks!
kenpla2 posted 11-20-2013 09:41 PM ET (US)
[Seven years later the thread has been revived to offer this advice:]
You should put in a couple ounces of Marvel Mystery oil with the gasoline and run [the boat] on plane for a couple of times. If [addition of fuel additive] starts to improve this problem, then [the fuel additive] is cleaning all the varnish out of the carbsuretors, all the jets, and seats. I put [the fuel additive] in the gas of a 250 Honda that would not stay running at low speeds. A day later [the engine] almost stayed running on its own. Two weeks later, and a couple tanks of gas with [the fuel additive] added, the engine runs, idles, and acts like brand new, with no adjustments made. [Using the fuel additive] will probably fix the problem for you if the float, needle, and seat are in fact sticking in rough water. I put [the fuel additive] in every tank of fuel for every thing I own that makes noise when I turn the KEY. [Suggests that use of the fuel additive will be harmless even if it does not provide a remedy.]

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Author	Topic: Evinrude 48 SPL problems
freediver111	posted 04-27-2006 10:43 PM ET (US) I have an Evinrude 48 SPL mounted on my Boston Whaler boat, It's been a big headache this year. I had a mechanic service it last year and it ran perfectly for about six months. Compression test, sparks, electrical, impellor, etc...all good. This past year had me out to sea for several months at a stretch so I stored the engine properly and ran it with fuel stabilizer (STA-BIL, the red stuff). I get back from these long cruises and take my boat for a dive and the thing runs great until I hit choppy seas and it dies! Following seas are no problem but as soon as we start to pitch it sputters and dies. I've had to come in to the harbor using my 9.9 kicker. I get it home and clean the plugs, drain the carb and let it sit for a while and it starts right up. I decided it might be a carb issue so I rebuilt both carbs. Take it out the next day and as soon as I get into choppy seas it dies again. I left shortly after for three months. I get back and start her up on the first try. It's running great in my yard but I know that as soon as I get it into the ocean it's going to die. I'm thinking it might be the fuel pump. I also run a water separator so I doubt water in the fuel is an issue. Help me out!!!! I'm getting really frustrated with it and am almost to the point where I might sell it and save up for a 4 stroke. Don't want to dump the cash if all I have to do is get a new fuel pump. Save my engine!!!!!! Thanks
jimh	posted 04-28-2006 01:16 AM ET (US) A float is sticking. Next time it dies give a carburetor bowl a sharp rap with the handle of a screwdriver to unstick the float.
Clark Roberts	posted 04-28-2006 05:52 AM ET (US) Could be the float(s) as Jim mentions and also could be a loose ground connection on the electronics or a short due to some faulty insulation. Good luck and happy Whalin'.// Clark.. Spruce Creek Navy
minitauk85	posted 04-28-2006 06:16 AM ET (US) It could also be debris in the fuel tank-k
freediver111	posted 04-28-2006 02:37 PM ET (US) I thought it was a float problem as well but it still did it after my mechanic rebuilt the things! The next day in fact. Not sure how to check the electrical short as you mentioned. How would I do that? Thanks!
kenpla2	posted 11-20-2013 09:41 PM ET (US) [Seven years later the thread has been revived to offer this advice:] You should put in a couple ounces of Marvel Mystery oil with the gasoline and run [the boat] on plane for a couple of times. If [addition of fuel additive] starts to improve this problem, then [the fuel additive] is cleaning all the varnish out of the carbsuretors, all the jets, and seats. I put [the fuel additive] in the gas of a 250 Honda that would not stay running at low speeds. A day later [the engine] almost stayed running on its own. Two weeks later, and a couple tanks of gas with [the fuel additive] added, the engine runs, idles, and acts like brand new, with no adjustments made. [Using the fuel additive] will probably fix the problem for you if the float, needle, and seat are in fact sticking in rough water. I put [the fuel additive] in every tank of fuel for every thing I own that makes noise when I turn the KEY. [Suggests that use of the fuel additive will be harmless even if it does not provide a remedy.]