I have a 2004 kawasaki stx 12 f jet ski with fuel problems and bad pump how do i empty and clean tank or remove it. Is there a fuel pump rebuild kit in place of the 400.00 pump cost? There is a lot of sediment in tank that destroyed the fuel pump and filter sock

$30 for the Service Manual

https://issuu.com/heydownloads/docs/2003_2004_kawasaki_stx-12f_jt1200-b1_b2_jet-ski_mo

Page 124 of the Owner's Manual. Check the fuses

https://ownersmanuals2.com/kawasaki/jet-ski-stx-12f-2004-owners-manual-69441

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Buy a haynes or clymer shopbook for that model..its what techs use. Try unplugn the computer on the device to see if it reboots. Umay hav a low or worn battery

You may have leaking crank seals. If they leak they can cause air to mix with the fuel before it gets to the carb, causing the motor to rev high unexpectedly.

FPO is the fuel pump code. Need to replace the fuel pump.

carbs clean and checked the fuel pump diaphrams not gone hard etc ?? tank and fuel clean and fuel getting to carbs ?? pulse pipes on intake manifold to pump clear and if you crank engine you feel a pulse of air ? plugs sparking ? i would fit a fuel primer bulb inline of feed to carbs and prime fuel and see if helps and as engine running see if priming keeps it running then i would check pump !!

the oil injection unit on these skis can fail to test you will need to empty gas tank disconnect oil feed line to inlet manifold
then make a mix of two stroke fuel to the correct ratio say 10 liters. poor in to tank and take ski for a run say 10 minutes let it rest and run again if problem persists

it is possible you have leaking or blown crank case seals you will most likely need a professional to test for
i have provided you a link for free shop manual

There may be water in fuel,would suggest rebuild of carb,clean and new carb kit,the diaphragm may be damaged do to age,if fuel tank hoses were clogged then more than likely trash has clogged the jets.

2003 kawasaki stx-12f jetski wont start.

You must take out completely the carbs and clean them especially their canisters with the flowters.They may have jelled gas inside or closed air pipes.Use a carb cleaner spray and compressed air.

If the teeter/totter needles are gummy or covered with moisture corrosion it could be the reason the machine is so hard to start. When storing the jet ski's syphon all the gas out and burn it in your car or truck. Even if you stabilize it it wont be good fuel in the spring. Your plastic tank will not rust so remove the fuel. You may be able to clean them up by running a tank of Chevron Techron through them. Before riding we charge are batteries and start are jet ski's on the trailer/lift before dropping in the lake. This saves the battery. It takes more juice to start the boat in the water.