if thats a 90 EFI Yamaha 4 stroke, then pull the intake off, its not as hard as you think, the bottom bolt is tricky. Take the throttle bodies with it. leave the VST attached to the intake. Once you have the manifold/VST assembly on the table, you can pull the screws out of the top of the vst and drop the resevoir off the bottom. Clean out the resevoir, replace the screen on the fuel pump. Take the injectors out, send them off to have them cleaned(I use injector rx), when you put it all back together, fush the mechanical fuel pump with carb cleaner, then gas. Replace the inline filter between the mechanical pump and the VST. Put it all back together, repalce the fuel line with new, install a water sep filter if you don't allready have one. I've done about 10 of these this year. I've tried every short cut, but its easier int he long run to pull it all apart and do it all at one time
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