2004 DF 90 starving for fuel

[Austintxoutboard]

The motor runs fine at idle speed but when I increase the throttle engine runs like it is starving for fuel. RPM vary irregular. Two weeks ago when I first had this prolblem It only ran for about a minute and then cleared up, but this week it ran erratically just about the whole time, except at low rpm. I have a water seperator and there is no water in the bowl. Fuel lines seem to be ok as well. Any help..

 

[Inducted]

Re: 2004 DF 90 starving for fuel

I'm not 100% sure BUT I think that engine has a low pressure fuel filter, High pressure fuel filter and a filter in the VST and maybe filters on the injectors. MAYBE it is time for some maintainence. You can test the fuel pressure with a gauge. When were the spark plugs last changed? How about the temp sensors? They should be a maintainence item too.

 

[Austintxoutboard]

Re: 2004 DF 90 starving for fuel

Others mention Flushing the VST tank, that it was oxidized fuel. At any rate, If anyone has done this process several times let me know if the engine runs like new.Speaking of the process, if anyone could explain how and clear this up in full detail. If not, let me know if you have any questions. If you try this let me know how it turns out.

 

[Austintxoutboard]

Re: 2004 DF 90 starving for fuel

To be able to flow fuel through the VST to flush it, this is what I did. I disconnected the the return fuel line from the bottom of the fuel rail. This hose flows unused fuel back into the VST tank. I plugged the fitting where it attaches to the bottom of the fuel rail using a piece of 3/8 fuel hose with a 3/8 bolt inserted in to it to plug it up. I then used a can of carb cleaner with the small "straw" tube (like on WD40) to spray the carb cleaner up through the open drain line into the VST tank. When I had sprayed as much as I could, I then blew air through the return fuel line to flush the carb cleaner back out of the open drain line. When I did out came a lot of sediment which looked like rust. But I was told by a Suzuki guru, that it was oxidized fuel.I did this process several times and now the engine runs like new.