another carb, brass in the bowl?(surely not gold)

[watermellonI]

I ve been going back and forth with float adj on mercarb 2 barrel on gm 3.0 after carb soak and rebuild finally got the dripping to stop and now the motor runs (well) for about 10 or 15 minutes then starts to drip, then floods. I can remove fuel line burn off excess (all while running engine) re attatch fuel line and carb is fine for another ten to fifteen minutes, I have been thru manual and forums and made sure everything is set where it should be, had to back off idle cam because idled high at startup

I would like to know if I need to rplace this carb as I have been going round and round with it.

I am also finding brass shavings in the bowl that ones really got me going nuts

As always I appreciate any input from such a great band of Professionals!!!

 

[JCF350]

Re: another carb, brass in the bowl?(surely not gold)

Find out where the shavings are coming from and fix that first. Then ya get to clean out the carb one more time.

 

[starsnstripers]

Re: another carb, brass in the bowl?(surely not gold)

Not sure if you have brass screens in carb,pump or filter? And have you checked for proper fuel pressure? I'm no pro but just a suggestion. Maybe fuel pump particles too. Oh another thought maybe the particles are blocking the needle/seat from proper fuel shut off by the float? good luck i'm sure more help is on the way!

 

[Maclin]

Re: another carb, brass in the bowl?(surely not gold)

My take on possiblities....

1.) Shavings coming in from somewhere and lodging in the fuel inlet area keeping the needle and seat from sealing.

2.) Float is not liquid-tight, begins to let fuel in and not float as well.


If #1 then the neoprene on the needle may be compromised now, may need a new set.

 

[45Auto]

Re: another carb, brass in the bowl?(surely not gold)

I'm not supposed to tell you this, but you have inadvertently discovered why gas has gotten so expensive lately. They have been putting more gold into it. Luckily for you, your special carburetor has the ability to distill this extra gold out of the gas. Run as much gas as possible through your boat and save those shavings up. If done correctly you could make enough to pay for your boat!

 

[watermellonI]

Re: another carb, brass in the bowl?(surely not gold)

no screens, I think the brass is coming from my inlet fitting, checked the needle tip and looks to be ok no marks that I can see, and when its closed I can t blow thru it.
I dont know if there s any brass in the fuel pump or not ( hopefully not) brass fittings I mean, I suppose I ll replace the whole fuel line setup, get away from the brass

wish that were true 45 I could use a little payback

 

[ziggy]

Re: another carb, brass in the bowl?(surely not gold)

no screens,

that's the screen in my right before my carb. no, it ain't gold either. it's rust.... in my case. probably from my fuel pump which has rusy screws........ you should get a screen. maybe ya'll catch the gunk before it gets to the bowl....

 

[Gary H NC]

Re: another carb, brass in the bowl?(surely not gold)

Ditto what Ziggy said.There needs to be a screen or some type of filter on the inlet.It only takes a tiny spec to mess up the needle from sealing.

 

[a70eliminator]

Re: another carb, brass in the bowl?(surely not gold)

That's bad, seriously you need to look into replacing your fuel tank or you'll be chasing that problem forever, your fuel tank is more than likely rusted up on the inside and there's only one solution.

 

[ziggy]

Re: another carb, brass in the bowl?(surely not gold)

a70eliminator That's bad, seriously you need to look into replacing your fuel tank or you'll be chasing that problem forever, your fuel tank is more than likely rusted up on the inside and there's only one solution.

if yer talkin to me, i know i should do something about it. though. i don't have any problems.(i R&R fuel pump filters + clean the screen regular) i think, like i say it's my fuel pump. i have replaced the diaphram and it had rust on the screws inside the fuel pump that looked just like what ya see in my screen. my fuel filter at the fuel pump has gotten cleaner with use. my boat sat in storage for 15 years prior to me gettin it.... as for fixin it.... i will. i have finally determined i have an auto fuel pump and it ain't gettin placed in service this spring till it has a new marine fuel pump + vent tube installed. that'll cure my rusty fuel pump screws, and my waiting to be bomb.....

 

[oops!]

Re: another carb, brass in the bowl?(surely not gold)

rusty tank.....replace or, take it out and send it to a radiator shop and have them "hot tank" it. i suggest replace. costs twice as much, bit lasts for another 10 years. once thats done you can start to clean the whole system. including the pump and repair carb as suggested.

I'm not supposed to tell you this, but you have inadvertently discovered why gas has gotten so expensive lately. They have been putting more gold into it.

45 i called the gas cops on u ! you wernt supposed to tell any one.

btw have u got thoes plans for a sluce box?

oops

 

[a70eliminator]

Re: another carb, brass in the bowl?(surely not gold)

if yer talkin to me, i know i should do something about it. though. i don't have any problems.(i R&R fuel pump filters + clean the screen regular) i think, like i say it's my fuel pump. i have replaced the diaphram and it had rust on the screws inside the fuel pump that looked just like what ya see in my screen. my fuel filter at the fuel pump has gotten cleaner with use. my boat sat in storage for 15 years prior to me gettin it.... as for fixin it.... i will. i have finally determined i have an auto fuel pump and it ain't gettin placed in service this spring till it has a new marine fuel pump + vent tube installed. that'll cure my rusty fuel pump screws, and my waiting to be bomb.....

oh I thought it was watermelons screen, I was ripping through the posts too fast, anyhow that's alot of rust to be from a couple screws.

 

[starsnstripers]

Re: another carb, brass in the bowl?(surely not gold)

Yeah, That was ziggys screen. there's a diff. between rust and brass(gas gold) ha! I'd say Clean carb and carb screen, fuel line back to the fuel pump and put the fuel line in a glass jar. Turn your engine over a few times so the pump pumps fuel into the jar and inspect the fuel. If it's clean maybe it was some filings from a fitting like you said. put it back together and try it again. Good luck!

 

[ziggy]

Re: another carb, brass in the bowl?(surely not gold)

oh I thought it was watermelons screen,

it is. sorry if ya thought my comment about my fuel pump was hijackin this thread. that wasn't my intention. he says he ain't got a screen. i looked up a mercarb in #4 and it had a screen in the parts breakdown. from the pic it looks like a screen will catch far smaller debrit than brass shaveings. i've havein trouble as to thinkin of where they come from to. w/o a screen i suppose they could be comeing from anything up stream.

I can remove fuel line burn off excess (all while running engine) re attatch fuel line and carb is fine

that sounds dangerous to me. anyways. i could see how ya could crossthread the fuel line connection between the carb and the fuel line doing that real quick with fuel being pumped out of it while the engine is running. i'd guess they're made of brass. crossthreaded screws leave brass shaveing behind. w/o a filter they'd end up in the bowl.....

that rust in my filter was strange looking rust to me. and it did take on a brass shiney look to it. specially when wet.... i don't know why, if i'd not have seen the rust on the screws prior to removing the screen at the carb. i mighta thought they was brass.

 

[watermellonI]

Re: another carb, brass in the bowl?(surely not gold)

I can remove the fuel line at the tank, wouldn t even consider takin her loose from the carb while running, KABOOM.

Does anyone know if its ok to go to a steel flex line from the fuel pump to carb? I don t know if its against any Coast Guard Regs, I can easily get the parts for that, to replace the fitting I need to buy the whole line.

 

[JCF350]

Re: another carb, brass in the bowl?(surely not gold)

If you are referring to a "braided" steel line then no you can't use them.
For testing purposes you can use a rubber hose to run the fuel into a glass jar. I would get a outboard hose and use the squeeze bulb and pump straight from the tank into a jar first (a small 12V fuel pump would work also). Then proceed downstream until the debris shows up in the jar.