1985 merc-v6 4.3 fuel problem;or vapor lock; or ignition.help?

fishtails4beer

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23foot imperial; after running% or approx 15 minites at 20~25 mph.the engine stumbles for a sec then shuts down like the fuel was shut off.the motor will restart right after this.ive benn chasing the problem since last spring.ive replaced filter at carb;fuel water seperator;rubber fuel lines.have re~built the carb;replaced fuel pump. Im leaning towards electrical now. Thunderbolt ignition module? Thanks for any insight.
 

xlur8ed

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Jul 12, 2011
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Re: 1985 merc-v6 4.3 fuel problem;or vapor lock; or ignition.help?

Have you replaced the coil?
 

fishtails4beer

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Re: 1985 merc-v6 4.3 fuel problem;or vapor lock; or ignition.help?

No i have not; will a coil be a very intermitten shutdown? The engine restarts immediatley. Did find small piece of silcone on end of fuel pick up tube last night.
 

Vamike757

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Jul 25, 2011
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Re: 1985 merc-v6 4.3 fuel problem;or vapor lock; or ignition.help?

No i have not; will a coil be a very intermitten shutdown? The engine restarts immediatley. Did find small piece of silcone on end of fuel pick up tube last night.

Any verdict on the problem? Sounds like that peice of plastic (silicone) could have been restricting your fuel.
 

fishtails4beer

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Re: 1985 merc-v6 4.3 fuel problem;or vapor lock; or ignition.help?

It was the problem; took the boat to northern lake michigan. And put about 70 miles on it so far this week with no problems. Havent caught many salmon only about 10. One 24 pounds. Take care.
 
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