Sputtering Suzuki DF140

[Y-KNOT?]

My 2004 Suzuki DF140 starts sputtering and surging when I get it over 3000 rpms. I had the same problem last September and I drained the fuel rail and VST and it solved the problem. When I tried to drain the VST this time nothing came out. Should the VST be full of fuel?

 

[reeldutch]

Re: Sputtering Suzuki DF140

the vst tank should always be full of fuel.
you might have gunk in it so the drain could be clogged .

disconect the fuel hose that comes from the high pressure fuel filter.
while turning the key in the on position(not cranking) the high pressure fuel pump should be running for a moment pumping fuel out the high pressure filter.
try to get a sample from there because thats whats inside your fuel rail injectors.

let me know what you got.

be careful to catch the fuel it might squirt al over the place.

 

[Y-KNOT?]

Re: Sputtering Suzuki DF140

I went down to the boat today and pulled off the VST tank and cleaned it. There was a lot of crap in the tank that looked almost looked like sand was in it. I let it soak in carb cleaner for about an hour until all the build up was gone. I replaced the needle valve and filter when I was in the tank. When I was putting it back together I dropped on of the spacers for the fuel rail overboard so I could not finish the job. Hopefully I will get that part this week and my problems will be solved. I will let you know what happens.

 

[Crispin]

Re: Sputtering Suzuki DF140

I'm having a similar problem... What is the VST tank?

I'm having a mid to high speed surge. Idles pretty well. This happened after running completely out of gas. Changed the low psi filter/water separator last night but no change.

I will do the high psi test. What about the high psi filter? Should I check/change that? Thanks, C.