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Discussion Starter #1
My boat has dual 4160's (450cfm)
The other day at the lake, the rear carb flooded out so I came home.
Fuel was pouring out of the front bowl vent tube as soon as the pump was on.
I have an electric pump from summit.
7psi/90gph.

The front carb has no problem at all.

Changed the needle/seat today.
Float was fine. Not sunk or anything like that.
Set it the same as the other carb.

With the new needle/seat, it does the same thing.
Just pours all over the place like there is no needle/seat at all.

Not sure how this can happen...
 

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Got Circus Midgets???
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1,734 Posts
Had the same thing happen to my 450s....on the 3rd new needle & seat the problem was solved.



.
 

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Premium Member
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681 Posts
Discussion Starter #3
I rebuilt both about a month ago, so this is the second new needle/seat.
I'll try swapping with the other carb and see what happens.

These things are pretty old, so I almost have a good enough excuse to go buy new 650's..:)bulb
 

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I rebuilt both about a month ago, so this is the second new needle/seat.
I'll try swapping with the other carb and see what happens.

These things are pretty old, so I almost have a good enough excuse to go buy new 650's..:)bulb
I am by no means a carb guy but have you checked to make sure the float isn't filling with gas?
Nevermind I just reread your post.
 

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Premium Member
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Discussion Starter #5
I just swapped the needles front to back. Same exact problem.

Fuel pressure is actually 12psi, which probably answers my own question.

I guess I have been lucky this did not happen earlier?
 

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Premium Member
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681 Posts
Discussion Starter #6
Thanks to a piece of good advise from Bell&Gaines, I took out the check ball/spring from my Summit fuel pump, cleaned it off, put it back in...now I have 5-7psi instead of 12.

Problem solved.
 
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