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Old 08-25-2013, 10:29 PM   #1
eander6655
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Default st 350 runs good untill I make a long run

I just bought a 2005 ST 350 and it runs good. Fires right up, good throttle response etc. I took it to the beach and I was going along at wide open throttle for about 3/4 of a mile and the engine started sputtering and back firing. I slowed down and it died. tried to restart in neutral and I had to use the choke to start it. After starting it was running okay. put it in forward and it was running okay until I ran down the beach a little further and it did it again. If i Just run around and vary the throttle this problem doesn't happen. It seems like it happens only after a long run with throttle on a high setting. I am scratching my head what could be happening with it. it almost acts like it starts to starve for fuel. The guy I bought it from put a new fuel pump on it but it is not an ez-go stock pump. I am going to try and adjust the valves and see if this helps it. any other ideas to try?
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Old 08-25-2013, 10:35 PM   #2
hsdtech
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Default Re: st 350 runs good untill I make a long run

It could be that the main jet in carb has some crud in it. I would check the valves and clean the carb real good and blow it out with air.
Have you checked the air filter?
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Old 08-25-2013, 11:15 PM   #3
Left Coast Kiteboarding
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Default

Several of us have been chasing the same problem. No solutions yet.


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Old 08-26-2013, 06:29 AM   #4
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Default Re: st 350 runs good untill I make a long run

Sounds like fuel starvation.
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Old 08-26-2013, 08:38 AM   #5
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Default Re: st 350 runs good untill I make a long run

Also check that your gas cap is vented.
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Old 08-26-2013, 11:10 AM   #6
eander6655
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Default Re: st 350 runs good untill I make a long run

Just checked gas cap and it seems to be venting. the fuel filter is not full of gas. I blew into the line from the engine to the fuel pump diaphragm and hear a gurgling noise. I am going to take it off and see what is in there.
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Old 08-26-2013, 11:37 AM   #7
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Default Re: st 350 runs good untill I make a long run

Fuel filters don't fill up.
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Old 08-26-2013, 11:57 AM   #8
eander6655
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Default Re: st 350 runs good untill I make a long run

how much fuel should be in the filter?
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Old 08-26-2013, 01:09 PM   #9
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Default Re: st 350 runs good untill I make a long run

Will appear to be like half full. If you slow down to a slower engine speed does it still cut off ? I'm thinking fuel pump may have some issues or the pulse line may have some oil in it..
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Old 08-26-2013, 02:22 PM   #10
eander6655
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Default Re: st 350 runs good untill I make a long run

the fuel filter is not half full.If i slow down and put it in neutral and rev it up it starts to run fine. put in gear and drives normal until I hold the throttle constant for a long period of time. Thinking about buying an OEM fuel pump for it.
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