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motors once again shutting off

Old 03-30-2014, 07:05 PM
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Default motors once again shutting off

Took the boat out for the first run of the season today and it ran top notch. When leaving today from where we had been sitting for a few hours.... I got on it and it ran great and then the port motor shut down and fired right back up and ran some more. Then after running for a while both motors started shutting down. Im at a loss..... vapor lock issue was fixed last year...... New mechanical fuel pumps on the EFI 502's.
only thing I can think of is maybe trash is getting into the fuel line from the tank because when I got back home I changed the fuel/water filters and some trash came out of the filters. Any other suggestions?
Thanks

Last edited by whiskeyhangover; 03-30-2014 at 07:07 PM.
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Old 03-30-2014, 07:37 PM
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When mine did that it was an oil pressure kill switch on sender. Clean the wire or replace
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Old 03-31-2014, 05:43 AM
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Was wondering if the anti-siphon valve could cause this to happen
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Old 03-31-2014, 06:23 AM
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Originally Posted by whiskeyhangover
Was wondering if the anti-siphon valve could cause this to happen
I had this hapen before on a boat.
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Old 03-31-2014, 07:01 AM
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Originally Posted by whiskeyhangover
Took the boat out for the first run of the season today and it ran top notch. When leaving today from where we had been sitting for a few hours.... I got on it and it ran great and then the port motor shut down and fired right back up and ran some more. Then after running for a while both motors started shutting down. Im at a loss..... vapor lock issue was fixed last year...... New mechanical fuel pumps on the EFI 502's.
only thing I can think of is maybe trash is getting into the fuel line from the tank because when I got back home I changed the fuel/water filters and some trash came out of the filters. Any other suggestions?
Thanks
Had a friends boat that had weak fuel lines from the tank to fuel pump and would suck the line shut then open back up, engines would start back up run a minute then shut down. pain to figure out. Worse part I was on Lake Erie bringing his boat back from Put in Bay because he was too hung over LOL.
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Old 03-31-2014, 07:29 AM
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Does it feel like it's starving for fuel? Generally this will lead to what I'll call a "soft" shut off where it slows down quickly, then dies. If it all of a sudden drops dead - a "hard" shut off - then I'd lean towards an electrical issue.
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Old 03-31-2014, 11:12 AM
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VST screens cold be plugged up and restricting fuel.
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Old 03-31-2014, 07:33 PM
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At what rpm is it shutting down? Hook a fuel pressure gauge to it and run it .See where the pressure goes

Last edited by motor; 04-01-2014 at 05:58 AM.
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Old 04-01-2014, 06:34 AM
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Thanks guys but i think i got figured out. Hey MOTOR.... put it at Aqua land yesterday and it ran great. I changed the fuel filters and found some trash in anti siphons. Forced some compressed air down the pick up rubes and it seemed to fix the problem. When your buddy restrings the boat this coming winter I'm going to need to clean the gas tank out.
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