Need to buy new 9.9

[Sako1]

You just got one response on the boating forum.....

[huntcountypussbuck]

If you have the money at this point you looks like you spent alot of coin trying to get back on the water. You could go new with warranty or buy used. Ive had some good luck on clist but you need to be careful and do your diligence if buying a used motor.

[Rickhem]

Originally Posted by Trevordog

I hear you guys about repairing rather then replacing, but it seems like I have done everything and it still runs like crap. Here is my problem. I can run it for about 30 minutes with no problem. As soon as back down on the throttle for something and then throttle up again, it will run for about a minute and then start to sputter like it is running out of gas, when I squeeze the primer it runs for about a minute and then sputters, pump primer and good for a minute and so on and so on......

I have done a carb kit, changed plugs, thermostat, impeller, fuel pump, oil pressure switch and still no change. Tried running with cap off and on fuel tank with no change.

I had a similar problem with an old 6hp evinrude years ago. It would start easily after squeezing the fuel bulb, but sputter out in a short time. I could keep it going with constant squeezing though, even running out on the lake. My problem turned out being leaks in the fuel line between the gas can and the engine. It would run fine as long as I kept the fuel line full by squeezing the bulb, but if I stopped, it would suck air and stall.
Maybe try another fuel line.....borrow one if possible and cross that off the list first before spending the cash for a new engine.

[Sleeper-6]

I second check your fuel lines. Not only the one from the tank to the engine but the ones under the cowel. Also check the impulse hose to the pump. (if it has one) No pulse from the crankcase to the pump will cause the pump to not work properly.

I have has issues where old lines were breaking down internally. They looked OK on the outside but the inside was swelling and blocking off fuel flow. It showed nearly that exact problem. The engine would run great for 20 mins and then starve for fuel and die.

For $10 in fuel hose, it's worth a shot.

[jrock]

I got a 2000 9.9 mercury mariner four stroke, and the damn thing runs as smooth as any motor I've ever seen. Highly recommend this motor. I've used it for trolling on the big finger lakes, small ponds, medium lakes, passaic river, deleware river, it performs great!!!

[Super]

I just got a Suzuki 9.9 4 stroke. Moves my boat faster than my Evinrude 15hp ever did and doesn't use much gas. Very happy so far.

[jimmythegreek]

Not sure where you are located but Im 5 min away from Lake Hopatcong and I think I can diagnose this engine quickly. I agree with what has been said on fuel line, if the diaphram/pump are good and replaced and you have done all of the above I would isolate the issue w a portable tank and a known good fuel line and I would also ultrasonic clean the carbs and remove all internal parts. You would be amazed how many times a carb kit does not cure a carb ethanol problem due to residue in the passages. The new small 4strokes are just as problematic as your '99 is, they are NOT tolerant of dirty fuel or carbs like 2 strokes of the past, but as long as that is good they are excellent motors. I wouldnt own another 2 stroke unless its a DFI large HP engine, I dont even like working on them anymore lol

[Trevordog]

Thanks for all the advise guys, this is clearly the best forum/page out there!

I am going to replace the fuel lines and also try a new tank and hose before I do anything else. Jimmythegreek, thanks for the offer on the diagnosis, may take you up on that if the above doesn't work.

[flatcreek]

I've run only non ethonol hightest in all my small engines. Have done this for the last two years and it makes a big difference. One pull starts most all the time, lower smother idle and no worries about old gas. With the ethonol you never know what your getting a station owner could just put a garden hose it the storage tank for a little extra profit and the water would just be absorbed by the alcohol.

[Sako1]

So where can you buy non-ethanol fuel? Thanks

Dave