Rochester carburetor question

[JLowe59]

Just finished replacing my rochester 4 bbl on a 1995 remanufactured 305. Everything lines up fine except...On the old carb there was a some type of vacaum pipe right above the fuel intake of the carb that ran to the fuel pump. No such line on the new carb. Does anyone know what that line is or does and can I just plug the vacaum line from the fuel pump? <br />Nothing is ever easy with an old boat.

 

[Gary H NC]

Re: Rochester carburetor question

Is it a clear tube?<br />Its a fuel line that vents fuel from the pump if it fails..<br />Is the new carb a marine carb?<br />I don't think blocking it off is a good idea.<br />Maybe Don S or Rodbolt can give you a solution..

 

[JLowe59]

Re: Rochester carburetor question

yes it is a clear tube, thanks Gary, <br />So is there any other place I can vent it to?

 

[JLowe59]

Re: Rochester carburetor question

it was purchased from what I think is a reputable remanufacturer. It was sold to me as a marine carb.

 

[Gary H NC]

Re: Rochester carburetor question

I know on my rochester 2 barrell it plugs into the base of the carb..<br />What year application was that carb supposed to be for?<br />It will have to be hooked up somehow for your safety and others..<br />one of the other guys should reply soon..<br />I'm sure your not the only one thats had this problem.

 

[JLowe59]

Re: Rochester carburetor question

Thanks Gary,<br />I also changed the fuel pump. I guess the new fuel pump has this saftey feature, the old fuel pump did not. There is a plugged vent line at the rear of the carb, I wonder if I can vent the fuel pump to it.

 

[Gary H NC]

Re: Rochester carburetor question

That may be where it connects..mine is on the back of the carb also.

 

[JLowe59]

Re: Rochester carburetor question

Thanks again Gary<br />I am hoping it could be that simple

 

[imported_Dave_C]

Re: Rochester carburetor question

Originally posted by JL Crestliner1979:<br /> Thanks Gary,<br />I also changed the fuel pump. I guess the new fuel pump has this saftey feature, the old fuel pump did not. There is a plugged vent line at the rear of the carb, I wonder if I can vent the fuel pump to it.

NOT if there is vacuum there with the engine running. Many run to a small tube that goes through the flame arrestor.

 

[JLowe59]

Re: Rochester carburetor question

Thanks Dave,<br />I am reluctant to just plug the clear hose into some line that I am not sure what it is. The vent on the back of the carb looks small and is not at the base but rather at the top. I do not have any line to attach to it. There was no such vent on my old carb. Can I plug the clear line and just check it regularly to make sure it is not full of fuel?

 

[Reel Poor]

Re: Rochester carburetor question

Originally posted by JL Crestliner1979:<br /> Thanks Dave,<br />Can I plug the clear line and just check it regularly to make sure it is not full of fuel?

NO NO NO,,,,,It MUST be hooked up so if the pump diaphram burst it will put the fuel into the throat of the carb.

 

[michael-lagrange]

Re: Rochester carburetor question

Dont plug it!!! listen to real poor, its a safety feature that you from going BOOOM!!

 

[Reel Poor]

Re: Rochester carburetor question

Originally posted by JL Crestliner1979:<br /> Thanks Gary,<br /><br /> There is a plugged vent line at the rear of the carb, I wonder if I can vent the fuel pump to it.

Is this vent line at the top edge of the rear of the carb, like the one in the pic? If so hook it up there.<br /><br />

 

[JLowe59]

Re: Rochester carburetor question

Thanks Rick, Thats exactly where my vent tube is but it is not barbed. It is smooth. Thats where I am going to hook it up.

 

[Gary H NC]

Re: Rochester carburetor question

Glad Real Poor had the pic and we got that figured out....Don't need a big boom!!
Now we need to get used to the forums and all the name changes??

 

[JLowe59]

Re: Rochester carburetor question

thanks for all the help guys. One more question...why is there only one terminal on the electric choke. I know I am supposed to power it with 12 "keyed" volts but why is there no neg terminal?

 

[Reel Poor]

Re: Rochester carburetor question

It's grounded thru the carb housing. No external ground wire is needed.

 

[JLowe59]

Re: Rochester carburetor question

I thought the carb gasket would prevent the carb from being grounded

 

[Reel Poor]

Re: Rochester carburetor question

If the carb wasn't bolted down it would.

 

[JLowe59]

Re: Rochester carburetor question

Of course!!! Why didn't I think of that.... Thanks for all your help... Changed my own carb. Saved money , made new friends and learned somethings.. Great site Special thanks to Rick and Garyh for the generous amount of time they give to people needing help.