dt30C running problems

[fishobx]

I have a 1992 Suzuki outboard. I have cleaned the carbs and jets thoroughly. When I put them back on, the motor will idle, but when running it bogs down and dies. I am thinking float problems, but sounds more like a fuel mixture problem. The question I am having is how to check? Thanks

[Solarman]

Sounds fuel related to me also. When you cleaned the carbs, did you use compressed air to blow through all the fuel, and air pas-sages? Did you remove the jets? And the needle-valve seat? Did you inspect/disas-semble the fuel pump(s), inspect l for damaged diaphragm, or damaged check-valves (clear discs in lower body)? If those discs are broken/fragmented, pieces can lodge in front of the needle valve, restricting fuel to the float.
Some things that need to be checked.

Good luck, post back what you find.

[fishobx]

Thanks. I did not check the fuel pump. That is next on the list. I wasn't sure that would be the problem because I didn't have any bogging issues before I cleaned the carb. I did take all three carbs out and clean with carb cleaner and blow it all out with air. I had some water in the tank so I rinsed it out and put fresh in. The filter was nasty, and I cleaned it out. Took off all the lines and blew them out. When I took off the fuel line going into the fuel pump there was some crud in the line, so I blew it out. Thanks for the help. I will get back after I check the pump.

[Solarman]

Also did you re-adjust float after removing the needle seat? Every time the seat is moved it has to be readjusted. If you didn't remove the seat, there could be the same crud blocking fuel to the needle valve.

Good luck.

[fishobx]

I did take the float off, and clean everything out. I am not positive of the float height. I believe it is .91-.99mm??? I just used the float pin for adjustment. I set it so the float was almost touching the float pin when open. So, when it moves up it pushes the float pin closes. I do not have a caliper to measure. It has been raining here on the outer banks for a couple days so I couldn't get into the fuel pump. Thanks for any and all you help.

[Solarman]

Can hook a tube to fuel supply inlet, turn carb to right-side up (just like it sits on motor), blow into tube and slowly raise float. Float should be level (not above level, or below level) when you can't blow air into tube. If above level, fuel will run out of carb throat when running. If below level motor will run out of fuel at higher speeds.
It doesn't take any pressure to stop the fuel, if it doesn't shut off the flow of air, then the needle and seat should be replaced.
Good luck.

[fishobx]

Ok, I see the rationale, but how will I know if it is level or not? Wouldn't I have to put the float bowl back on, therefore covering the float?

[Solarman]

Actually, if you can't measure the float setting, per the manual, I was giving you a way to improvise.
If you hold the carb, and imagine fuel in the bowl to be close to level, then you can blow into the tube by mouth, while gently raising the float (just as fuel would raise it, with a finger), flow will stop. If you can't imagine (fuel filling the bowl), the float reaching a level point, as you raise it, then you need to get a good tool to measure the float per the manual specs, and procedures.

Good luck.

[fishobx]

Right on. I gotcha. I will try that. I took off the fuel pump, and in the process broke the oil sensor. BUMMER.

[fishobx]

I don't know about the check-valves. I don't know where that is.

[Solarman]

Go back and re-read what I wrote. It tells you where they are.

Good luck.