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Old 08-02-2017, 12:11 PM
Junior Member
Join Date: Jun 2016
Posts: 3
Default Mercruiser 5.0L dies when throttled to high speed

My 1998 5.0L Mercruiser Alpha 1 V8, upgraded to the Surestart system, faltered after being underway at about 18-21 mph for about 20 minutes and died.

Restarted easily, got underway, and again faltered and stopped. Not an abrubt stop but a maybe a 5 to 8 second power down when the throttle was advanced.

Restarted and idled to a mooring field about 1-2 miles away and got towed back to the launching ramp.

I was able to duplicate the faltering and quitting at advanced throttle back home on the trailer.

What I've determined so far:

NO water in the fuel. Poured the contents of the water separating filter into a clear bowl and it was all gas. Gas and carb filter were clean.

Ran a fuel pump test and it pumped a healthy stream of fuel into a bottle. Fuel was both new high octane, pumped in on the way to launch and treated last years fuel. It work well in my pressure washer.

Distributor cap had slight pitting on contacts which I cleaned off.

Haven't looked at the carburator jets.

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