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2000 33 SST/OUTLAW twin 502s

Old 07-03-2021, 03:30 AM
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Default 2000 33 SST/OUTLAW twin 502s

Contrary to me display name Iím running a Baja (upgraded a few years ago)

I am looking for help on an odd problem. Sounds simple but has proven difficult to fix.

I have random fuel starvation problem on both engines in my boat. This happens when the tank is full or low. It comes in the form of low fuel pressure on one engine or another. ( yes it jumps around, never both at the same time)

To eliminate the stupid solutions like change full filters and check or fuel pressure regulators, all this has been done countless times and always comes back within spec.

This usually happens (but not limited too) after I run up the lake and sit for a while. Iíll go to fire the engines and both will fire and run but within 10 seconds one will die (never both)

after that the dead engine never seems to come back. By the time I get home and get tools onto it always fires up.

so hard to diagnose a problem that isnít happening and of course it only happens on the water, gonna bring the tools and fuel pressure testing equipment on the next ride.

but before I turn family boating day into a test and tune day I figured I would ask the masses if they have had similar issues? And ideas?

The boat only has 450 original hours and has been stored inside more of its life. Iíd like hope to hope that this doesnít turn out to be a maintenance issue.

Welcoming any sound advice on where to dig for a solution. Spending thousands on parts is not a solution for me.

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Old 07-03-2021, 06:18 AM
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Do you run ethanol gas?
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Old 07-03-2021, 06:51 AM
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Possible vapor lock. Do both motors share one fuel pick up?
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HOSSMAN (07-06-2021)
Old 07-06-2021, 05:45 AM
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Do 502s have the Cool Fuel chit? My 2000 29 w 454 mpi mags. would do that regularly- run for a while- then sit, drink a beer and die after start up.
Took all the cool fuel chit off and never had the problem again.
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SB (07-06-2021)
Old 07-06-2021, 07:55 AM
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vapor lock. Many threads and several fixes in here on this. Best seems to be return fuel to tank.

Originally Posted by Quinlan View Post
Do 502s have the Cool Fuel chit? My 2000 29 w 454 mpi mags. would do that regularly- run for a while- then sit, drink a beer and die after start up.
Took all the cool fuel chit off and never had the problem again.
yup, these year mpiís will have the cool fuel system.
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Old 07-06-2021, 08:12 AM
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Hey OP I had a 2252 Arriva back in the day cool boats, I also had a 2000 33 OL with 502 mag mpi's and both engines would v lock but the port side did it more often........lift the hatch a couple feet to vent the engine bay this will help
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Old 07-09-2021, 04:01 PM
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Also, remove return lines from both fuel filter heads and then T them together and run them into the 3rd bung in the tank. Helped a lot with mine. Eventually I ended up having to replace both fuel pumps. 98 454 mags

NOTE: that trick came from Eddie Young w/ young performance motors!
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