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33 Invincible Starving for fuel

Old 01-01-2019, 07:21 AM
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Default 33 Invincible Starving for fuel

I just recently purchased a 2017 33’ invincible which we took offshore, we ran on the 2 saddle tanks and then switched over to center on way back in with no problems. I had the marina fill all of the tanks up when they pulled the boat. We where on our way back offshore yesterday and the motors where running on the center and I decided I wanted to switch to saddles before we got running out the inlet so we switched over both motors we ran for about 1 minute and both motors shut down, both primer bulbs where sucked flat, switched back to center and ran fine. We tried it a couple more times, at idle and running with same results. Any help would be appreciated.
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Old 01-01-2019, 07:24 AM
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Originally Posted by DTET View Post
I just recently purchased a 2017 33’ invincible which we took offshore, we ran on the 2 saddle tanks and then switched over to center on way back in with no problems. I had the marina fill all of the tanks up when they pulled the boat. We where on our way back offshore yesterday and the motors where running on the center and I decided I wanted to switch to saddles before we got running out the inlet so we switched over both motors we ran for about 1 minute and both motors shut down, both primer bulbs where sucked flat, switched back to center and ran fine. We tried it a couple more times, at idle and running with same results. Any help would be appreciated.
Have you done any basic trouble shooting? Checked filters? Vents? How did you do the switch over?
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Old 01-01-2019, 07:33 AM
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Yes port and starboard filters are good as motors both run fine on center tank. Each motor has its own fuel valve one for port motor that switches from center to port and one for starboard that switches from center to starboard. We tried switching over at low rpms, 3/4 speed and idle with same result every time
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Old 01-01-2019, 07:49 AM
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Sounds like you got the valving mixed up.
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Old 01-01-2019, 07:52 AM
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Originally Posted by Blazer7420 View Post
Sounds like you got the valving mixed up.
This.
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Old 01-01-2019, 08:04 AM
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Originally Posted by Blazer7420 View Post
Sounds like you got the valving mixed up.

yup. You are likely switching it from center to off, not center to saddle
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Old 01-01-2019, 08:50 AM
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I agree, you may have mixed up valving. I have never changed over fuel sources while engines are running. Is that OK to do? Perhaps check your manual or post up some pics of your configuration.
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Old 01-01-2019, 09:28 AM
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I switch between tanks with the outboard engines running all the time and never had any issues. Also agree issue is probably picking wrong position on the selector. The Invincibles are pretty easy - just make sure the point is positioned where you want to select vs the handle itself (if that makes sense).

If still an issue, might try opening tank cap after engine dies and then try to start (without touching selectors). This might show that it's a vent issue or not.
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Old 01-01-2019, 09:50 AM
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switch from MAINs to AUX (and back) while running & never had an issue..
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Old 01-01-2019, 09:56 AM
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Originally Posted by mystery View Post
I agree, you may have mixed up valving. I have never changed over fuel sources while engines are running. Is that OK to do? Perhaps check your manual or post up some pics of your configuration.
Manual? Would love to see that.
There is also no problem switching tanks while engines are running.

agree with others. Most likely shut off in error.
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Old 01-01-2019, 10:10 AM
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Originally Posted by Extractor View Post


Manual? Would love to see that.
There is also no problem switching tanks while engines are running.

agree with others. Most likely shut off in error.
My boat's manual talks about fuel valves, transfer valves, etc.
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Old 01-01-2019, 10:16 AM
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The Invincible manual is actually pretty detailed.
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Old 01-01-2019, 10:48 AM
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Originally Posted by Extractor View Post


Manual? Would love to see that.
There is also no problem switching tanks while engines are running.

agree with others. Most likely shut off in error.

Here you go




Last edited by Lazy Bones; 01-01-2019 at 11:03 AM.
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Old 01-01-2019, 11:36 AM
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Maybe a bad anti-siphon valve?
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Old 01-01-2019, 11:52 AM
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Have you verified the marina actually filled all the tanks?

invincible has been known to label or plumb their valves incorrectly so check their.
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Old 01-01-2019, 01:29 PM
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Lazy bones..... Showed me the way. Too funny. Did your 33 come with a manual?

When did you get your 36? Trip 300's..... I'm sure I'll see you in grand if you have it. Congrats
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Old 01-01-2019, 03:05 PM
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Here are pictures of my valves, when in this position primer balls suck closed when I try to run. If I rotate arrow to center the balls fillback up and runs fine.
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Old 01-01-2019, 04:12 PM
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What happens if the dial is set to OFF? Does it actually stop the flow (like it is doing when you have it to STBD)? The switch on my 36 is the same, but the labels/positions are different as mine is OFF/STBD/CENTER vs yours at CENTER/STBD/OFF?

If you open the fuel fill for the STBD tank, can you pump the ball? Very odd same thing is happening to both aux tanks. My guess is the selector is set up wrong or something along those lines.
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Old 01-01-2019, 04:27 PM
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I’ve towed more than a few boats home from offshore due to being out of fuel. I can remember a handful of times it was due to they had assumed that the marina had filled the tanks like they had asked, which they did not. As someone mentioned above, this could very easily been your issue as well. I could see how an employee of a marina could fill one tank and think he had filled the boat with gas. I’d check there first and see how many gallons they put on before I went fixing my boat.
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Old 01-01-2019, 04:33 PM
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I have confirmed that the tanks have been filled. I have a feeling it has something to do with the marking on the valves, I am going to go in the morning and try turning them to the off position and see if that solves the problem. Thanks for all of the input
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