95 dt150 help please

[dkshooter]

well I finally got to the water and absolutely no difference I unplugged the sensors to see if that let it open up but no. Here is the strange thing if I open it up all the way it advances to around 2000 rpms but that's it. if I trim it up under full throttle when it gets up a ways I think after it gets off the trim cylinders it ramps up nicely???? I'm out of ideas...... help?
thanks guys

[dkshooter]

thanks guys the river is dropping pretty fast I'm on the Mississippi and any rain will cause flooding maybe by this weekend. hope I can finally put new stickers on the boat!!!!!

[Solarman]

dt 150 running issues

Dk we all hope for the best, both with the water level so you can get there, and hopefully that your motor runs as good as it should.
Those of us here will hope you get back to let us know how it goes.
Good luck, and hope it finally works for you. keep us posted.

[aquamort]

ok
had a mechanic check the fuel pressure claimed it was low and replaced the high pressure fuel pump. one of the first things I tried was checking the timing.
tore down both low pressure fuel pumps looked clean vst cone screen had a little crap but I cleaned it anyway.
the high pressure filter was replaced by the first mechanic to work on the motor but I will check it again driving down to the river now to see if I can get to the landing.
I really want to thank you guys since I have been unable to use the boat for 3 1/2 years now! I hope this thread will finally end my nightmare.

3 1/2 years ***!! I hope it works out for you. I know what its like. I once had a Merc apart I dont know how many times looking for an overheating problem!

GOOD LUCK.

[dkshooter]

sorry guys but I am really excited to think that I my get the motor going... went to the river it looks like there is around 200 yards of water to recede before I can check the performance. again thanks.

[dkshooter]

ok
had a mechanic check the fuel pressure claimed it was low and replaced the high pressure fuel pump. one of the first things I tried was checking the timing.
tore down both low pressure fuel pumps looked clean vst cone screen had a little crap but I cleaned it anyway.
the high pressure filter was replaced by the first mechanic to work on the motor but I will check it again driving down to the river now to see if I can get to the landing.
I really want to thank you guys since I have been unable to use the boat for 3 1/2 years now! I hope this thread will finally end my nightmare.

[Solarman]

dk, I just noticed your motor shows 2.

Your parts page says you have 2 low press fuel pumps, have you inspected both pumps?
If you have then check the filters on the high press feel pump before you run to the lake/ river to test. There should be a small cone filter at the bottom of the vst, you may have cleaned already. If not check it. Then check the high press filter between the high pressure pump (below the vst) and the injector rail. If first filter (cone) is clean then the second may be ok, unless high press pump is deteriorating.
After these checks, it should be time to try the river.

[aquamort]

Ok. By no means am I a Suzuki guru but there all nut and bolts to a point. Sounds to me like fuel (low pressure) or timing problem (not advancing).

Can you hook up a fuel gauge at the Injector rail? (Im presuming its injected?) See if your pressure dies at all? Hook up a timing light and see if the timing advances?

Also just check that your throttle valve is opening fully at WOT. You would hate to spend $$ if thats all it was Just some very basic checks there.

[dkshooter]

went thru the vst looked clean but I cleaned it anyway a little stuff on the outlet screen but other than that clean the check valves are all intact and look good.
as for the top end performance when I advance the throttle it acts normally to around 2000 rpms then there is just no change no missing,surging or anything maybe a gas smell like it is flooding but Im not sure

[aquamort]

Just throwing it out there....has full throttle been checked with your linkages etc?

Also i think i asked a long time ago..when it doesnt go past 2000rpm is it missing and farting or just bogging down?

[Solarman]

check valves

The check valves are the clear plastic wafers that should be under the thin rubber diaphragms.

[dkshooter]

I have had it at several boat shops over the last few years so it is hard to tell what might be the source I will clean the vst and check the filter next but I don't think this was the original problem the river is finally dropping so maybe I can get the boat back in the water soon

[Solarman]

a nest in your fuel pump??

Have you had the gas lines removed for an extended period of time?? This is strange. Maybe you should clean out the vst, and filters? Never know what else has gotten through?

[dkshooter]

well... I pulled the low pressure fuel pumps I found what I think you are referring to as the check valves is it more like a diaphragm? there is 1 on both sides of the middle piece of the pump a little smaller than a dime? What I did find was a nest a mud dauber or something in the lower low pressure fuel pump I have no idea how this got there!!!! the real problem is that the river is above flood stage and I cannot get the boat to the river guess I will have to wait I do not have much hope that this was the problem because my luck is not that good, thanks for the help

[dkshooter]

Ok I will go and pull the fuel pumps right now, but .... does that mean I'm screwed if those check valves are fubared?