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Old 08-23-2010, 12:55 AM   #1
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Default 95 Maxum 1800SR 4.3 hesitating bad at half throttle to full throttle after warmed up

Been having an issue with my boat, after the boat is warmed up (runs fine for first 30 mins or so) it seems to be stalling out or badly hesitating at half throttle to full throttle but never dies. back off the throttle its fine its seems as if its not getting fuel from the 4 barrel meetering jets when the 4 barrel opens up. Spark is good new distributer, new coil, new plugs and wires, fuel pump is working good, checked the fuel pickup check valve in the fuel tank its good checked and replaced fuel filters. No choke on my carb so I know its not the choke closing when it shouldnt. I am baffled Not sure what to look for anymore. any help would be greatly appreciated.
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Old 08-23-2010, 11:25 AM   #2
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did you turned your fuel filter upside down to look foor water in to it. if there is to much water in the engine takes fuel and water in at a certain moment....and believe me.......it does'nt run on water......check the tank if there's water in it (that was the problem i had with my bayliner a few years ago)

greatz, ed
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Old 08-23-2010, 01:17 PM   #3
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Yea I have already cleaned the fuel tank out and checked my fuel filter. That was my first guess on what the cause was but it didn't fix it.
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Old 08-23-2010, 02:07 PM   #4
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then it gets too less fuel or something wrong with the ignition mechanism, look if carb. works fine, needles in the carb. open fully, take it of and clean it, check al the holes in the carb. if they ar clean so that al the fuel needed can go true....look if there's no old fuel (that's rubbered) in the holes (here in holland in the harbours during the summer you buy other fuel then in the winter.......the summer fuel has additives that change to very, very, very little rubber balls when it gets to old, and they can constipate the little holes were fuel has to go true)

these ar just some ideas to check......clean your whole fuel system from the beginning till the end......

succes, ed
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Old 08-23-2010, 02:18 PM   #5
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What kind of carb is it Soldier?

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Old 08-23-2010, 02:18 PM   #6
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I have replaced fuel lines fuel pump fuel filter checked the tank and pickup tube and check valve replaced distributer cab rotor coil plugs and wires the only thing left to do is rebuild the carb (I hate rebuilding carbs lol)
I was wondering though if a intake leak would cause the engine to do what its doing?
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Old 08-23-2010, 02:19 PM   #7
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Its the weber 4 barrel carb I think, I know its a 4 barrel
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Old 08-23-2010, 04:25 PM   #8
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Would be good to know which carb it is Soldier, kind of surprised it's a 4BBL on a 4.3. Are the secondaries huge compared to the primaries?

1) Engine
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Old 08-23-2010, 04:46 PM   #9
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Would be good to know whic carb it is Soldier - are the secondaries huge compared to the primaries?

Nevertheless:

1) Engine starts fine?
2) In the 1st 30 minutes engine runs fine and will accept 1/2 to WOT without hesitation?
3) After 30 or so minutes engine will not accept 1/2 to WOT without hesitation?
4) After 30 minutes engine and starting at idle, engine will accept 1/2 throttle without hesitation?
5) After 30 minutes when you go to 1/2 to WOT and the engine hesitates, you can reduce throttle and it will then run fine, up until you try to go to more than 1/2 throttle?
6) When the symptom occurs, is there any back firing/popping through the carb or exhaust?
7) After warm up can you ever get the thing to run past 1/2 throttle at all? Can you coax it up to WOT?

When this symptom occurs, have you tried to very gradually open the throttle all the way? In other words, with the engine warmed up and starting at idle, slowly open the throttle over the course of, say, 15 -20 seconds.

First off, the engine should be up to normal operating temp within 5 or 10 minutes, unless you are not running a thermostat, so I don't think it really has anything to do with the engine temp. It could possibly be a vacume leak, but at this moment I'm more inclined to think the fuel tank vent is clogged/obstructed. A quick test you can do for that; when the symptom appears bring the engine back to idle then go unscrew the fuel tank filler cap - no need to take it all the way off, and re-tighten - then try to run it to WOT again.

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Old 08-23-2010, 09:24 PM   #10
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you i always forget something.....

oke Dan, that can be the problem also......
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at this moment I'm more inclined to think the fuel tank vent is clogged/obstructed. A quick test you can do for that; when the symptom appears bring the engine back to idle then go unscrew the fuel tank filler cap - no need to take it all the way off, then try to run it to WOT again.
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greatz, ed
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