engine won't run continue

[richard]

After fighting the engine over heat and solved [=D>] , another issue happen immediately [:^(] ,
after fix the overheat problem,Went out for wakeboard on the sea 4 hour ,all is fine,until back to the hard stand and flushing the engine,it can't run continuely , test the following:
1 ) spark plug,remove a spark plug,no wet,has spark when crank,
2 ) fuel rail and fuel cell ,has gasoline splash,fuel press looks like normal ,
3 ) check all breakers ,in kick board and engine room,no tripped,
4 ) lanyard checked ,no open circuit,
5 )battery checked good enough ,
any where I should check ?
* the temp gauge long time in zero,
* oil gauge don't drop to zero even turned off the engine,
* recently idling not so steadily and had few times stall these not happen before,
* when press start ,the engine looks firing until release the button.
Appreciate any advise

[surroundsound64]

What engine?

[jasper]

Just a guess: water in the gas. After pulling boat out of the water and letting it sit, water will settle to the bottom of the gas tank where the gas pickup is located. Drain you fuel control cell into a glass jar to see if there is any water in the gas. Water will settle at the bottom of the fuel control cell. Water in the gas will cause the engine to run rough.

[richard]

thanks for reply,the engine is GT-40 EFI in a 2001 Super Air Natique with closed water cooling system,have 1200hr on it

[richard]

https://www.youtube.com/watch?v=x-ln...ature=youtu.be
still not fix, any thought ?

[BrickBrock]

Richard,
Your video is private.

[richard]

The link ok now,I forgot to publish,sorry.

[scottb7]

My neighbor had same problem and it was bad gas....

[richard]

* it ran strong few minutes backward on the ramp for removing the boat to float again onwater because the trailer and boat stuck on the ramp, then the issue occur when flush the engine .
* find the gas finished at the moment,than fill it up with new gas.
* suspected Lanyard and checked, open current of the lanyard is 45ma on DVM,is this right ?
* Both low and high pressure pump are running,so can get gas strong fire out from the injector rail test point.

[richard]

got a OBDII scanner from China, but can't find the right connector for the GT- 40, seems they are unify to a standard type, how you guys connect it to the STO of GT-40? or any one know how to modify it?

[jasper]

The problem does not sound like a bad lanyard. If the lanyard switch was bad, the fuel pumps would not work and the engine would shut down immediately after firing. Your engine attempts to continue to run. Check the fuel control cell for water in the gas. Even if your gas tank was almost empty and you put in fresh gas, any water that was in the tank will settle to the bottom of the tank where the fuel pickup is located. The problem could also be a clogged fuel pickup.

[richard]

OBDII sanner have different plug

FCC was checked no water inside and filter was changed,injector rail have enough pressure and gas even I don't check with a fuel pressure gauge,I can see strong gas fire out when pressure the test needle , I brought pressure so I can tell how many psi later.

[richard]

update: Turned out the issue was caused by the faulty fuel siphon valve,when stronger suck, it stucks

[jasper]

Thanks for letting us know what the problem was. I did not know that year of the boat had an anti-siphon valve.

[richard]

the breaker on the kick board beside the toggle switch always stripped down when starting the engine that misleaded me a while when trouble shooting ,that controls the fuel pumps.