2006 9.9m chronic fuel system problems

[TrueNorthist]

Dual purpose questions for my merc colleagues. I have a repeat patient in my sick-bay, a fairly well maintained 4 stroke 9.9hp merc that appears to have great difficulty with regular gas. (~10% booze) I'm now on it's third carb kit and second fuel pump in 3 years. Not Merc's fault they put hard liquor in cheap gas, but telling folks they must buy the most expensive gas on earth is tricky at best.

I'm inclined to believe this motor is prone to such issues, owing to possibly not being the greatest design and should no longer argue with my client that there's still value holding onto this problematic creature. There is value in it, only it may be in making it run well, which it will for a time until the carb gets fouled or fuel pump internals melt again, and sell it to somebody happy to dole out an extra 40 cents a litre for alcohol free premium. Even then this motor tends to be hard starting on premium, at least according to my client, who is the guy I have to convince to hang onto it.

I'm beginning to wonder though, if I'm trading my hard earned reputation for something that might repeatedly bite me on the transom. Are these "early" early 4 stroke mercs as problematic when run on today's increasingly booze soaked fuels as I am beginning to suspect?

Thanks for your considered replies. If my post even hints at OMC snobbishness, please accept my sincere apologies. No such criticism is intended.

 

[flyingscott]

Ethanol is not your problem a 2006 motor should be just fine on 10%. Are you buying cheap carb kits because they should not be failing that quickly. how are the fuel pump internals melting? Is the tank and hose good quality or cheap. Are you positive he is only running 10%? Ethanol has been around for 30+ yrs.

 

[TrueNorthist]

That's non-responsive. I'm not asking for a diagnosis. I've already done that and determined there's a problem with slightly phase separated e10 fuel and the water/crystals that accumulate in the fuel pump and tiny jets and circuits in the 9.9m carb.

Further, all my clients that use e10+ have some degree of fuel problems eventually, those that burn booze free gas mostly do not. QED

I am inclined to believe this particular model/year motor has significant problems with any amount of ethanol. I'll be getting a visit from a merc engineer next week and I'll raise the problem with her.

 

[flyingscott]

That's non-responsive. I'm not asking for a diagnosis. I've already done that and determined there's a problem with slightly phase separated e10 fuel and the water/crystals that accumulate in the fuel pump and tiny jets and circuits in the 9.9m carb.

Further, all my clients that use e10+ have some degree of fuel problems eventually, those that burn booze free gas mostly do not. QED

I am inclined to believe this particular model/year motor has significant problems with any amount of ethanol. I'll be getting a visit from a merc engineer next week and I'll raise the problem with her.

HMMMM another blame the ethanol thread. Then why post except to bash Mercury and E-10. You might want to find the thread on here where it was asked about ethanol problems. You might be surprised at the answers.

 

[TrueNorthist]

With all due respect sir, I'm not really interested in opinions either way. I go by what I see in my shop and that's typically about an 80/20 split of fuel vs ignition problems, and at least half of the fuel problems are attributable to ethanol, if not more. With this season being quite cool and wet, very wet -- the split is now almost 100% ethanol related with folks burning cheapest e10. Phase separated fuel is very easy to spot and sometimes very expensive to recover from, regardless of theory. I am obliged to react and proceed on what I actually see.

 

[flyingscott]

With all due respect sir, I'm not really interested in opinions either way. I go by what I see in my shop and that's typically about an 80/20 split of fuel vs ignition problems, and at least half of the fuel problems are attributable to ethanol, if not more. With this season being quite cool and wet, very wet -- the split is now almost 100% ethanol related with folks burning cheapest e10. Phase separated fuel is very easy to spot and sometimes very expensive to recover from, regardless of theory. I am obliged to react and proceed on what I actually see.

If.you dont want opinions then why post???? 3 carb kits 3 yrs fishy fishy!!

 

[TrueNorthist]

Insert non-response response here. You truly disappoint me.

 

[flyingscott]

Insert non-response response here. You truly disappoint me. [/QU
​​​Actually.you.are the disappointing one, You start a post on a public forum and can't handle.responses. You still havent answered my question why post????

 

[flyingscott]

You specifically say in your post you are asking a question? If you cant handle being disagreed with may you shouldnt post. Maybe your Ego is to big to accept what is really happening.