No Start and Old Fuel

[NLOE]

I have a 2007 Sea Doo GTI SE 155. I've had Battery Voltage problems for about 10 months now so I've had old gas sitting in the ski. I have replaced the solenoid, spark plugs, ground wire, power wires to the fuse box, voltage regulator, and battery. When I put the key in and press start, it sounds like the engine tries to start but stops after one second and won't turn over. Is this most likely a bad fuel problem? I also noticed the wiring from the voltage regulator to the engine rear (I think AC generator) were burnt so I replaced those wires too.
I am planning to siphon out the old fuel, but what else should I do? I can't seem to find any Carburetor on parts lists online on my specific Jetski. Sounds like a dumb question but are there carbs on my ski? What else in the fuel system can I clean out?

 

[Ckrawiec]

I have a 2007 Sea Doo GTI SE 155. I've had Battery Voltage problems for about 10 months now so I've had old gas sitting in the ski. I have replaced the solenoid, spark plugs, ground wire, power wires to the fuse box, voltage regulator, and battery. When I put the key in and press start, it sounds like the engine tries to start but stops after one second and won't turn over. Is this most likely a bad fuel problem? I also noticed the wiring from the voltage regulator to the engine rear (I think AC generator) were burnt so I replaced those wires too.
I am planning to siphon out the old fuel, but what else should I do? I can't seem to find any Carburetor on parts lists online on my specific Jetski. Sounds like a dumb question but are there carbs on my ski? What else in the fuel system can I clean out?

Your ski is fuel injected, so no carbs to fool around with.
Your ski is 12 years old, so a fair numbers of problems should be expected at this age.
Fresh water or salt water rider?
Can you define what ->battery voltage problems<- meant to you?
Looks like you've already parted out bits and pieces.....no mention of the starter being changed. What about the power cables to the starter?
It's time to chase the wiring in the ski.....test everything, assume nothing. Cables always LOOK OK, (I've cut cables open to find nothing but powder inside from corrosion). A voltage meter checking OHM resistance and continuity through your wiring will certainly help.....doesn't cost anything but some time either....start with the FREE stuff, then the cheap stuff, then the more expensive stuff...just throwing parts at it doesn't really throubleshoot the problem....it just muddies the water. Slow and methodical.....you'll get there.

 

[NLOE]

Your ski is fuel injected, so no carbs to fool around with.
Your ski is 12 years old, so a fair numbers of problems should be expected at this age.
Fresh water or salt water rider?
Can you define what ->battery voltage problems<- meant to you?
Looks like you've already parted out bits and pieces.....no mention of the starter being changed. What about the power cables to the starter?
It's time to chase the wiring in the ski.....test everything, assume nothing. Cables always LOOK OK, (I've cut cables open to find nothing but powder inside from corrosion). A voltage meter checking OHM resistance and continuity through your wiring will certainly help.....doesn't cost anything but some time either....start with the FREE stuff, then the cheap stuff, then the more expensive stuff...just throwing parts at it doesn't really throubleshoot the problem....it just muddies the water. Slow and methodical.....you'll get there.

Gotcha. what should be done to the fuel system other than siphoning out the old fuel from the tank?
It's a salt water rider but I flush the system with hose water after every ride.
I used to get a Low Batt. Voltage code on the ski when I ride out. sometimes the ski would stop dead in the water while riding then start again after a minute. This kept happening until eventually it stopped turning on. I found the wiring yesterday that was corroded by measuring resistance on a voltage meter. I fixed those wires so I no longer get the Low Batt Voltage code. I fixed the ground and power wires from the battery, they have good readings on the volt meter now.

 

[Ckrawiec]

Gotcha. what should be done to the fuel system other than siphoning out the old fuel from the tank?
It's a salt water rider but I flush the system with hose water after every ride.
I used to get a Low Batt. Voltage code on the ski when I ride out. sometimes the ski would stop dead in the water while riding then start again after a minute. This kept happening until eventually it stopped turning on. I found the wiring yesterday that was corroded by measuring resistance on a voltage meter. I fixed those wires so I no longer get the Low Batt Voltage code. I fixed the ground and power wires from the battery, they have good readings on the volt meter now.

Fuel Injection makes it a little bit more challenging regarding bad fuel.....sure you can siphon out the tank but if the injectors are "impeded" even slightly...you'll be battling full fuel volume not being introduced into the cylinders at those critical times when the ski is asking for it (WOT). Fuel system cleaner/injector cleaner might help but the ski needs to be running and on water to truly get the exercise it needs to pull the fuel cleaner through the system (as running on the hose on the trailer is really only for short periods of run time). You could also pull the injectors and clean them outside the ski...but that's just the injectors....pulling cleaner through the fuel system would be best...especially if you suspect any fuel/water contamination.

Salt water runners, I would suspect, introduce a much better chance of "electrical" gremlins....salt corrosion is relentless, no matter how fastidious you are regarding wash downs/flushes. Once it gets into the wiring....you don't see it until the "gremlins" start to show up (and as you indicate - you got them already).