Reply To: 25 HP Suzuki Problem

[David Stanton]

Thanks for all the tips. Spark plugs have already been changed (3 cyl). Yes it’s a 4-stroke. Fished this afternoon and again it trolled fine but had to go slow between fishing spots. On the last leg, returning to cabin at about 5 MPH, it got steadily worse, and would quit under mild throttle increases, but always started right up again, with good cranking so battery is OK. Finally it quit when put in gear, and after a couple of more starts, it would no longer start. Had to get towed. Fuel filter still full, and it’s white semi-clear plastic that you can see into – no water there and fuel looks good at that point. I don’t have any way here of measuring fuel pressure to injectors. After the fuel filter, the fuel goes to a black plastic round thing about 2 inches in diameter and 1/2 inch thick that only has a fuel line in and out and it is mounted vertically at the rearmost part of the engine at the bottom just below the cylinder head. I can’t see if there is any connection to the engine behind it for vacuum, etc., but this maybe the low pressure fuel pump. From there fuel goes to the starboard side of the powerhead, behind intake manifold to a cylindrical black plastic thing with a small diameter rubber line attached to the top that could be a vacuum line or a higher pressure output line of it – maybe this is the high pressure pump? The manifold hides most of it. I can’t see any more of the fuel path and don’t have much along for tools. I’ll look again with that VST filter in mind, but I doubt I can see or identify it. We have two boats here for 4 guys and will limit the dead boat to a couple fishing spots close by that we can go to and from with the electric trolling motor. There is no Suzuki dealer the area.
Again, thanks for the tips, and if anyone reads this that knows this engine and can offer more insight, it will be appreciated.
Dave