Merc carb situation

[elwilliams13]

3.0L Mercruiser 2 barrel carb. Boat not run in a while. Mechanical fuel pump. Rebuilt carb and when put in it was overflowing. Adjusted float no more overflow. Now it drips from the arm in the middle of the venturi(Forgot what they are called.)on the right one but not the left. During rebuild I recall the kit had washers that went around the 2 jets at the bottom of the bowl. Put them in but did not remember if they were there to begin with. Would this cause the one to drip?<br /> Thanks,<br /> E.L. Williams

 

[elwilliams13]

Re: Merc carb situation

^

 

[SwampNut]

Re: Merc carb situation

Sounds like the float is still too high, or not working at all. The jet washers wouldn't do this.

 

[elwilliams13]

Re: Merc carb situation

I was leaning that way. Anyone know what the float should be set at. Lost my manual this last hurricane season. Haven't got a replacement yet.

 

[uaw9fan]

Re: Merc carb situation

I think it's 3/8 with a solid needle,and 9/16 with a spring loaded needle.Measure from the gasket to the dot on the toe of the float while holding the top of the carb upside down.

 

[elwilliams13]

Re: Merc carb situation

Thanks will try this out

 

[elwilliams13]

Re: Merc carb situation

Update:<br /> Rebuilt carb per manual, originally brought a spring loaded needle vs. the solid that came with the kit. Carb float height set float has no fuel intrusion. Still dripping from the venturi tubes. Will the height of the base to intake gasket make a diffrence? Kit brought a paper thin one vs. the original one that was about a quarter inch thick. Will the solid needle work better? When I disconnect the fuel line and run it on the residual fuel in the bowl does not drip at all. I am stumped! Any help is appreciated.

 

[rebelmandziukan]

Re: Merc carb situation

ya let me know what happens cause i got the same problem with the same carb

 

[rebelmandziukan]

Re: Merc carb situation

i just rebuilt mine but i dident put in the little gaskets

 

[elwilliams13]

Re: Merc carb situation

Hey rebel,<br /><br /> Maybe we can figure this one out. It seems like it is getting too much fuel no matter what I do. Maybe someone else will chime in.

 

[newport dave]

Re: Merc carb situation

I had the same thing, same carb, a few months ago. Put in the solid needle and it worked perfectly.<br /><br />Dave

 

[NOSLEEP]

Re: Merc carb situation

Some floats will absorb fuel and become heavy<br />leaving the needle and seat unsealed. It will <br />allow fuel to run into the ventures and cause<br />the very problem you describe. Did you change<br />the float? If its not the float then you may still<br />have a needle and seat problem.

 

[rebelmandziukan]

Re: Merc carb situation

i dident change the float but i will next weekend. plus should i convert it back to the solid needle?

 

[elwilliams13]

Re: Merc carb situation

I put the float in water and it stayed up for many hours.

 

[Bondo]

Re: Merc carb situation

Water is MUCH Denser than Gasoline,.......<br /><br />Of Course it Floated......<br />

Kit brought a paper thin one vs. the original one that was about a quarter inch thick .<br /> <br />During rebuild I recall the kit had washers that went around the 2 jets at the bottom of the bowl. Put them in but did not remember if they were there to begin with.

Quarter Inch Thick,..???..... Come On,.... Let's get Real here........<br /><br /><br />Here's a few little Tips about Carb. Kits.........<br /><br />1,....Installing a Carb. Kit is an Exact Science...<br />It has to be done Exactly Right.....<br /><br />2,.....Carb. Kits, Usually fit more than 1 Carb.,... You're Supposed to use the Exact Parts that you Removed from the Carb.,....<br />You Can't pick,+ choose Which pieces to change,...If a washer or gasket IS in the Carb.,... Replace It,... If there Wasn't 1,..... Don't Add it....<br /><br />3,.....Carb Kits are a 50/50 Roll of the Dice,......Carb Kits Don't/ Can't Always Fix the Issues,.......<br />Sometimes,...... Up to 1/2 the time,.... The Carb Castings are Just Plain JUNK............<br /><br />Sooooo,...... My Best Guess is;......<br />Either you Screwed Up the Rebuild,..........<br />Or,.....<br />The Carb is Junk,+ Needs to be Replaced........

 

[rebelmandziukan]

Re: Merc carb situation

hey elwilliams look what i found if you get sick of chasing the problem here is a cheap alternitive $188 for a remanufactured carb<br /> http://www.flyingfishcarburetors.com/index.html

 

[rebelmandziukan]

Re: Merc carb situation

they have a lifetime warrenty and free shipping and free return of your core. I think im gonna go this way with a reman carb and see what happens. ill order next week and post the results.

 

[elwilliams13]

Re: Merc carb situation

Ok sounds good.

 

[admar]

Re: Merc carb situation

hello all. just a little side info on ( mercarb) 2 barrel carburetors. they are a very poor copy of a rochester 2 barrel, very poor. mercuy marine has issued over a dozen pages of service bullitins on these units. flooding idle is a very comon problem. low or rough idle cause the 3.0 engines to shake and will cause needle and seat not to shut off fuel at idle. make sure idle speed is correct, also check ignition timing as this can cause rough idle also. i will check bulitins, i belive 3.0 engines reuire spring loaded needle, at least this month. engine serial number would be great as bulitins are grouped by that number.

 

[rebelmandziukan]

Re: Merc carb situation

I'm going to tampa this saturday early am to get my new reman carb. they have a life time warrenty so i hope i wont have any problems. the company claims to test the carbs so it should be a bolt on and run kind of thing. i probably will have to adjust the idleand im hoping it cures all my carb woes. as stated before i will post results on saturday evening