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Old 01-03-2013, 02:11 PM
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No start Mercruiser 350

1994 Ciera 26' mercruiser 350. The boat was swamped in the engine compartment in storm. Replaced coil, internal ingn module in distributor, plugs, rotor, cap, replaced mechanical fuel pump (old, faulty) with electronic one, starter solenoid, dialed in distributor, replaced carb, water in tank, pumped flushed tank, fuel clean, added methyl hydrate.

Started engine, started on third hit. dialed in timing, carb etc.... Ran well for about 20 minutes then began to serge, RPMs dropped (surging) oil pressure sounder went off, shut down immediately. Pulled distributor, pressure tested oil pump, fine. Tested spark, week. Pulled batteries, charged on trickle over night. Taking down to try and start it again today.

Where do I go from hear ???
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Old 01-03-2013, 03:49 PM
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Originally Posted by NoteTech View Post
1994 Ciera 26' mercruiser 350. The boat was swamped in the engine compartment in storm. Replaced coil, internal ingn module in distributor, plugs, rotor, cap, replaced mechanical fuel pump (old, faulty) with electronic one, starter solenoid, dialed in distributor, replaced carb, water in tank, pumped flushed tank, fuel clean, added methyl hydrate.

Started engine, started on third hit. dialed in timing, carb etc.... Ran well for about 20 minutes then began to serge, RPMs dropped (surging) oil pressure sounder went off, shut down immediately. Pulled distributor, pressure tested oil pump, fine. Tested spark, week. Pulled batteries, charged on trickle over night. Taking down to try and start it again today.

Where do I go from hear ???
Did you change the oil? Bet there is crap in the oil pan.

Did you take the plugs out and turn the engine over to clear the crap out of it.

Also did you blow out the lines for water before adding more fuel.

Did the oil pressure buzzer go off while the engine was running or when it stopped.

Also regular or salt water?
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Old 01-03-2013, 04:08 PM
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Replace fuel filters? Electronic shutoff?oil sender shut the pump off? Sounds like you ran out of fuel.
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Old 01-03-2013, 05:51 PM
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Oil is clean.
Turned over when changing the plugs.
Blew out lines, drained tank (with pump) flushed tank, tested fuel, good, before adding 200 ltrs.
Serging, oil buzzer went off when surging.

Salt water usage with fresh water engine cooling heat exchanger.

Sounds like I ran out off fuel. Yes it dose. Checked fuel (water trap fuel filter, good) good fuel flow (8 psi)
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Old 01-03-2013, 07:03 PM
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Originally Posted by NoteTech View Post
Oil is clean.
Turned over when changing the plugs.
Blew out lines, drained tank (with pump) flushed tank, tested fuel, good, before adding 200 ltrs.
Serging, oil buzzer went off when surging.

Salt water usage with fresh water engine cooling heat exchanger.

Sounds like I ran out off fuel. Yes it dose. Checked fuel (water trap fuel filter, good) good fuel flow (8 psi)
Water actually making it to the carb can cause them to run very poorly cause the water does not pass thru the jets properly. Easily cause a stumble like you discribed. But with a boat you have no real way to clear it out without draining the float bowl. In a car you just floor it and it blows it out but of course a boat will no be happy with tje engine jumping.

Can you drain the float bowls? If you can capture some fuel and see if its got water you may be able to find your problem.

During the first 20min run did you drive the boat and was it running properly at cruise speed. If it only crapped out at full bore i would say the new fuel pump is not keeping up but it should idle fine. Can you check the pressure while the engine is under a load

I am assuming wires and plugs were changed.

Sorry for all the questions and no answers. The reason i ask of ot was flooded by salt water is because even a very short time can trash wireing and electronics of all kinds. Even the modual in the dist. Would be junk if submerged for any length of time in salt water or normal river water for that matter.
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Old 01-03-2013, 07:53 PM
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NoteTech,

Check the fuel filter in the carb. Any trash in the lines will plug this filter. Also disconnect the throttle cable so you can operate the carb from the engine and not the helm. Then crank it over and spray some starter fluid in the carb. If it runs for a moment then you know it is fuel.

Scholman
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