Fuel problem??

[jettdigsit]

I have a 1989 DT55 w/ oil injection. When I took it out the other day it didn't seem to want to run wide open. It dies within 30 seconds of being given more throttle. It will idle great, but just not when its given more throttle. I checked the compression - 130 on all three cylinders. Strong spark. I also tried squeezing the bulb when under way and it seemed to bog down the motor. While I was checking a few things out the other day, I squeezed the bulb and noticed raw gas was leaking out of the exhaust. Is this normal or do I have a problem with a needle and seat? Could it be the fuel pump or am I way off track? Any suggetions would be very much appreciated. Thanks in advance for any assistance.

 

[45_red]

Re: Fuel problem??

Classic symptoms of a dirty carb. could also be a bad float.

 

[jettdigsit]

Re: Fuel problem??

Thanks, for the reply 45_red, I had the carbs off and cleaned them up which i thought was pretty clean they were really dirty. I am going to rebuild all three carbs and see if that does the trick. Thanks agian for the reply and I will let you know the results.

 

[jim dozier]

Re: Fuel problem??

Jettdigsit that could also be caused by a leaking diaphragm in the fuel pump. If the inner diaphragm leaks it will inject fuel into the bottom cylinder through the intake port. Leaky fuel pumps can cause an engine to run lean or rich depending on where the leak is. If the carb rebuild doesn't fix it, check the fuel pump diaphragms for leaks (actually if you go to the trouble to get it apart just replace them).

 

[jettdigsit]

Re: Fuel problem??

jimd, Thanks for the reply, I rebuilt the carbs the other night and also checked the fuel pump...... bingo!!!! It had a tear in the innner diaphram just like you had expected. I will order the part on monday and hopefully be back on the water by the weekend. Thank you very much for the help. Also do they make a rebuild kit for the fuel pump? Because the two suzuki dealers here in town only sell the whole assembly.<br /><br />Thanks Again!<br />Greg

 

[jim dozier]

Re: Fuel problem??

I don't know for sure about your model but I bought a kit for my DT85 which consisted of 2 diaphragms and 2 O rings for a total of $22. Go online and check brownspoint.com and you can see the parts diagram for your engine and you can either order from them or at least give your Suzuki dealer the parts number for the kit if it exists.

 

[jettdigsit]

Re: Fuel problem??

Finally, received the fuel/pump today... I installed it and off to lake I went. The motor took off great ran for a few minutes but when I went for WOT it bogged down and died. Stared back up fine and same thing this went on for about 25 min. then finally I was able to get it to run WOT. Ran it this way for about 45 min. Found a nice spot shut the motor down and drowned a worm for about thirty minutes went to go back to the launch and same problem. I am not sure what to do I replaced the fuel/pump, rebuilt the carbs, put on a new gas line and bulb and has a new gas tank. any help would be greatly appreciated. Thanks in advance for any assistance.

 

[jim dozier]

Re: Fuel problem??

Check to see if the fuel line connector to the engine is leaking. Also is it possible that detritus from the damaged fuel pump diaphragm got past your engine fuel filter and lodged in your previously cleaned carbs. Your symptoms sound like either a clogged jet or an air leak, either of which will cause a lean condition. You might try unscrewing the drain bolt/screw at the bottom of the carb bowls and draining the carb bowls onto a clean white rag and check for crud. Otherwise I would bite the bullet and reclean the carbs. If you do make sure you dismantle the carb and remove the jets and after cleaning with carb cleaner blow them out with compressed air and set the floats to manual specs. You wouldn't be the first boater to have done an incomplete job of cleaning a carb .

 

[jettdigsit]

Re: Fuel problem??

Thanks for the quick reply Jim. I will dismantle the carbs agian tonight(3rd times a charm) and clean them. I ordered a new fuel line connector (male & female) should see them on tuesday. when I squeeze the bulb should it sound like there is air escaping out of the fuel filter assembly?<br /><br />Thanks agian!<br />Greg

 

[jim dozier]

Re: Fuel problem??

No the fuel filter should be air/fuel tight, otherwise the fuel pump vacuum would cause it to leak air which could be your problem. Remove the filter assembly and have a close look at it. I believe the filter bowl unsrews and there is an O-ring in there that may be leaking.

 

[jettdigsit]

Re: Fuel problem??

Replaced the O-ring in the filter bowl, ran all new fuel lines and also dismantled and cleaned carbs. Hooked up the ear-muffs, started motor and no water is coming out of the pisser. Looks like my impeller has gone bad. My question is, would this problem be related to the intermitent shut down of the motor? Almost like a safety of some sort. I did notice the water that came out before was extremely hot but figured this was normal. <br /><br /> Thanks <br /> Greg

 

[jettdigsit]

Re: Fuel problem??

ok....finally replaced the impeller found that all the paddles had completely come off. Only thing left was a rubber hub. Had to clean out water jacket through lower-unit inorder for water to get through. Also found out that the fuel filter had been put in upside/down (you can only guess who did that? oops..) Took it out this morning and ran great! Until... about 2hrs of running it the alarm buzzer came on and it lost power would only go about half power. Have a great stream of water, still using oil, and nothing appeared on my gauges. what possible could this be? Duck season is very close and would like to hunt with this boat/motor. Any help would be greatly appreciated. Thanks in advance for any advice.