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TOPIC: The elusive carb problem has returned...

The elusive carb problem has returned... 11 Jan 2009 18:37 #1

  • CapeOfStorms
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2 Mercruiser certified mechanics later and the following problem still occurs (although never when they do their test run...):

Engine starts fine and idles fine. After warming up (oil pressure at 65 and temp at 140) and cruising at 3500 to 4000 RPM for about 5 minutes (10 minutes in total), when slowing down to idle, the engine stutters and cuts out. This is the first time I throttle down after running at high RPM - I never get a second chance...

When I open the engine bay, there is fuel dripping from the carb at the throttle lever assembly onto the engine and there appears to be a hissing and escaping "gas" from the main carb gasket between the carb and the engine (the carb has been torqued down correctly and the gasket is fine).

After mopping up the fuel with a rag in one hand and the fire extinguisher in the other, the engine starts fine after about 30 minutes (I did not attempt to start it any sooner).

They have both had the carb off, opened it up and given it a clean bill of health...
The carb is a Rochester 2bbl, electric choke, thunderbolt V ignition

Any ideas (I'm running out of mechanics here...) :confused:

PS: I now hold the club record for being towed in 3 times in less than a month... :mad:

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Neil M
1999 Ciera 2355
Mercruiser 5.0 220HP with Rochester 2bbl carb
Alpha 1 gen 2 outdrive
2000 EZloader custom 2 axle trailer

The elusive carb problem has returned... 11 Jan 2009 23:23 #2

  • captharv
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Have you tried another new carb?
Sounds like a float problem or they have set the bowl level wrong. That carb is not THAT complcated!

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Captharv 2001 2452
"When the draft of your boat exceeds the depth of water, you are aground"

The elusive carb problem has returned... 11 Jan 2009 23:44 #3

  • dmcb
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And that carb is not safe. Scrap it and do as Capt Harv suggests.
A new one.
And along with that a new mechanic to install it.
If you have told a mechanic your carb leaks gas and he reinstalled it to do the same thing, he is no mechanic.
Doug

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Started boating 1955
Number of boats owned 32
Bayliners
2655
2755
2850
3870 presently owned
Favorite boat. Toss up. 46' Chris Craft, 3870 Bayliner

The elusive carb problem has returned... 11 Jan 2009 23:45 #4

  • mainecoast
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Sounds like the needle isn't setting properly. There is a little spring device that holds the needle to the tab on the float and has to be installed properly and in the correct hole...or you get the kind of symptoms you describe. Did these guys disassemble or rebiuld the carb?

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[SIGPIC] [/SIGPIC]
1989 2650...an ongoing restoration...but I'm totally clueless...It just happened to be running the day this photo was taken.
Isn't owning a boat always an ongoing restoration?

The elusive carb problem has returned... 11 Jan 2009 23:47 #5

  • ChrisP
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Got to agree with the previous posts.
1. Get a new mechanic
2. Put a new carb on it or get someone qualified to rebuild it

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Chris
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The elusive carb problem has returned... 12 Jan 2009 03:21 #6

  • seapuppy
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one..it's the float..it's not set properly and when you throttle up..it pumps more fuel into the bowl ...the needle valve won't shut the fuel flow off and you get flooding.....so..the best thing to do is replace the carb...or get it completely rebuilt...and too the correct float setting....

:arr arr

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The elusive carb problem has returned... 12 Jan 2009 03:41 #7

  • 2850Bounty
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Very difficult to diagnose on a forum.
But if it does run for the Merc mechanic, (assuming that he test drove it) then you may not have a float level issue at all!
What you may have is a needle/seat issue, or a fuel pump pressure issue....... and an intermittent one to boot.
Did either of them test the fuel pump pressure?
Did either of them test the stopping ability of the needle/seat?
Was the needle/seat replaced/adjusted?

The idea of having this re-installed with out properly identifying and/or correcting the problem (as per how you describe this fuel leaking around the base) is putting you at risk.
Not good!


Did you pay to have this diagnosed, corrected ....... or just exploratory work?

.

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Rick E. Portland, Oregon
2850 Bounty Sedan Flybridge model
Twin 270 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set

The elusive carb problem has returned... 12 Jan 2009 09:39 #8

  • biohazard
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I know the parts might be an issue, he has posted in the past that parts there take many weeks to get, good mechanics are few and far between. Anyone at BOC that can help him get a carb would prolly help :)

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Ryan
Hastings, Minnesota

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"Sonnie Due"
1999 Bayliner Ciera 3055
Twin Mercruiser 5.7L Bravo 2[/FONT]
MMSI : 338122217
"If you wish to make an apple pie from scratch, you must first.....invent the universe"
- Carl Sagan

The elusive carb problem has returned... 12 Jan 2009 11:30 #9

  • CapeOfStorms
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Thanks for the help everyone. Safety is the top priority here. I'll check these specific items with the mechanic over the weekend when he wants to create a "re-enactment" of the problem (I'll take the engine bay cover off as well to spot the problem early and prevent and assist with venting bay). Rick, I paid specifically to have this issue corrected so besides the test this weekend, the mechanic is going to get a severe dressing down in the strongest of ways.
Has anyone purchased a remanufactured carb from boatfix.com? Any issues or comments ?

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Neil M
1999 Ciera 2355
Mercruiser 5.0 220HP with Rochester 2bbl carb
Alpha 1 gen 2 outdrive
2000 EZloader custom 2 axle trailer

The elusive carb problem has returned... 17 Jan 2009 22:45 #10

  • CapeOfStorms
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After much research, it appears the carb is an automotive unit !?!?!? The serial number indicates it's off a Camaro. Interesting that two mercruiser mechanics didn't pick this up... It also makes sense that it was leaking through the throttle shaft after flooding. The following is a quote on the difference between marine and auto carbs:

"Throttle shafts also get special machining attention. Shafts are "grooved" and "slabbed" to prevent fuel from exiting out the throttle shaft if flooding should occur. When a carburetor floods fuel will end up "puddling" on the throttle plates. A non-marine carburetor will allow this fuel to seep out of the throttle shaft ends and onto the manifold. This is not allowed on a marine carburetor because normally the engine is situated in an enclosed bilge where potentially deadly gasoline fuel fumes can accumulate. Throttle shafts that are "grooved" and "slabbed" channel the flooded fuel safely down into the intake manifold. With no raw fuel allowed to puddle on the manifold outside the carburetor, there is no chance of deadly fuel fumes to accumulate in the bilge and no chance of explosion or fire"

Resolution: I'll be buying a new carb this week...

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Neil M
1999 Ciera 2355
Mercruiser 5.0 220HP with Rochester 2bbl carb
Alpha 1 gen 2 outdrive
2000 EZloader custom 2 axle trailer

The elusive carb problem has returned... 10 Feb 2009 03:18 #11

  • mainecoast
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So, what happened? Inquiring minds would like to know.

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[SIGPIC] [/SIGPIC]
1989 2650...an ongoing restoration...but I'm totally clueless...It just happened to be running the day this photo was taken.
Isn't owning a boat always an ongoing restoration?

The elusive carb problem has returned... 10 Feb 2009 12:57 #12

  • TerryW
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This is a big tease. We were wondering whether it was a automtive carb because we read the other posting.

Come on let us know if your problem is cured.

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Terry (Retired Diving Instructor and Part Time IT Consultant)
1998 Bayliner 2452. 5.7l V8 - Edelbrock 1409 4bbl - Alpha1Gen2 - Solent UK.
MMSI 235061726

The elusive carb problem has returned... 10 Feb 2009 19:19 #13

  • davidwigler
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Check JEGS.com for a new marine carb. Great service. I bought two from them in the past year and they arrived within days.

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The elusive carb problem has returned... 26 Feb 2009 03:27 #14

  • redfarm
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my guess would be the distributor switch it is housed in the distributor. if you search you'll find it. i have posted this before. they tend to start to go after about 7 years. new ones are waterproof old one are not. when the distributor metal pass though the magnets in it it breaks the circuit and send the spark. they can overheat and etc. get a new one..about 60 bucks and send my a $100 for gas :-).

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The elusive carb problem has returned... 27 Feb 2009 15:09 #15

  • CapeOfStorms
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Thanks Dave, I'll check it out.

I've been really busy at the office for the past month and a deal to buy a new marine carb locally just fell through so I'll be searching for a unit this weekend...

An online shop called Nautical Harbour (with excellent credentials) had a good deal but it looks like they have closed down... :kidding

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Neil M
1999 Ciera 2355
Mercruiser 5.0 220HP with Rochester 2bbl carb
Alpha 1 gen 2 outdrive
2000 EZloader custom 2 axle trailer

The elusive carb problem has returned... 28 Feb 2009 01:01 #16

  • redfarm
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I'm telling ya. Try the ignition sensor first. You can return it if it doesn't fix it or spend $600 on the carb and it is yours. If this part starts to fail it will be intermitent as you described. When you put a 12v tester on it it will test fine (meaning it have 12v from its source) until it starts to fail. This is located under the rotor. Good luck.

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The elusive carb problem has returned... 28 Feb 2009 02:08 #17

  • dmcb
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I believe he has an auto carb on it now.
Not good. The carb must be replaced anyway.
Many will not allow a return of electrical parts.
Doug

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Started boating 1955
Number of boats owned 32
Bayliners
2655
2755
2850
3870 presently owned
Favorite boat. Toss up. 46' Chris Craft, 3870 Bayliner

The elusive carb problem has returned... 01 Mar 2009 15:49 #18

  • shaka
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I'm working the same sort of problem, changed everything but the sensor it will be here Tuesday ill let you know the results...5.7 w/ bravo III 98 model new carb last year ran great all summer now will start an run 30 to 45 seconds then die .. been through fuel system twice including pump very frustrating hope the sensor does the trick
ED

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The elusive carb problem has returned... 01 Mar 2009 19:08 #19

  • SoFloStone
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Welcome to the BOC SHAKA, hope you get your problems sorted out quickly.

Rick

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______________________________________
1996 Bayliner Trophy 2002 WA
"KNOT-TOO-LATE"
1998 Mercury 150 EFI
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The elusive carb problem has returned... 07 Mar 2009 17:00 #20

  • shaka
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OK Heres the deal I changed everything from the coil to the sensor and no joy
Pulled the carb cleaned the bowl no help pulled the carb adjusted the float no help tried adjusting the fuel air screw it didn't seem to do make any difference "thats not right " pulled the carb blew out that jet an all orifices pertaining to it
re adjusted installed turned the key wallaa purrs like a kitten... I spent 20 to 30 hours trouble shooting this problem and a couple hundred dollars an it turned out to be E-10 fuel that is causing the problem. I used fuel treatment did all that and still the bad fuel caused the problem it runs fine on the same fuel but you cant let it sit for long periods of time...anyway i hope this might solve some of your issues Ed

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The elusive carb problem has returned... 10 Mar 2009 13:44 #21

  • jroon
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I don't know if this will be helpful but I will throw in my two cents: I had a class A motorhome with a Dodge 360 in it, it would start like a dream when cold, BUT,as soon as it got hot you were doomed! It would stall and flood and send fuel all over the place. You could even see fuel coming out of the secondaries on the four barrel! I had a couple of fires in the doghouse(wife was really impressed)from backfiring and was about to let it burn the next time until I talked to an old mechanic from a Dodge dealership. He asked me if I had checked the vent solenoid for the float bowl. This solenoid closes the float bowl off from atmospheric pressure when the motor is not running(has to do with emmisions), I would think that the carbed boats out there would have the same thing just as a safety issue. It turns out that my solenoid was toast so I simply removed the rubber plug on the flapper and lo and behold it ran like a top after that. I don't recommend removing the plug on a boat, but maybe a replacement solenoid would do the trick.

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2002 Trophy 1703/90hp Merc
1985 Lund 16ft /25hp Merc
2001 HD Roadglide
1989 HD FXRT
2002 F350
If indeed its Lonely at the Top
WHO CARES
Its Lonely at the Bottom Too!

The elusive carb problem has returned... 17 Jun 2009 16:20 #22

  • CapeOfStorms
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Hi all,

New carb fitted over the weekend (It took 3 months for the new unit to arrive). A short test run and all worked fine.

Pity it's the middle of winter here otherwise I would have been out for longer than 30 minutes...

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Neil M
1999 Ciera 2355
Mercruiser 5.0 220HP with Rochester 2bbl carb
Alpha 1 gen 2 outdrive
2000 EZloader custom 2 axle trailer
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