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won't run and occasional backfire

Lumps

Active Member
Hi All,

I have a 2000 seadoo challenger 2000 with the mercury 240 EFI engine.

It was running last year but would not start this year. the fuel was very old (quite brown) I replaced the fuel and now it will start for a second before stalling. repeated attempts cause a backfire. Old fuel has has been replaced with new fuel and i drained as much out of the vapour separator and water filter. fuel looks clean and no water. port side temp sensor was replaced. and I cleaned out the fuel filter. still not running more then a second then stalling (in trailer). but a after repeated attempts to start it, it will let out a massive backfire.

I thought there was just still old fuel and that it was just a matter of time before the clean fuel made it in. but with the back firing im worried that im causing damage.

Anyone have ideas what I should look at?
 
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