carb problem
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Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
carb problem
fountain of gas
--------------------------------------------------------------------------------I tried posting this in the fuel forum but no response i am sure someone here can tell me with all the experience this forum has.
when doing a wet float check on a 2150 carb there was a 2' fountain of gas it also leaks gas out of the sides of the carb where the rod for the butterflies come out is this too much fuel pressure
--------------------------------------------------------------------------------I tried posting this in the fuel forum but no response i am sure someone here can tell me with all the experience this forum has.
when doing a wet float check on a 2150 carb there was a 2' fountain of gas it also leaks gas out of the sides of the carb where the rod for the butterflies come out is this too much fuel pressure
Senior User
Joined: Jan 2002
Posts: 438
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From: Centreville USA
Could be. Can you measure the fuel pressure? Should only be about 6 - 7 psi for a stock, carbureted engine. I took a vacuum/pressure gauge and hooked the rubber hose to the outlet of my fuel pump. Cranked the engine over a few times. Gave me a reading of about 7 psi.
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Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
the whole carb was rebuilt and works great the valve seals it at low pressure but not at high pressure what would cause a non electric fuel pump to produce too much pressure
Senior User
Joined: Jan 2002
Posts: 438
Likes: 0
From: Centreville USA
Can't answer that one, but you should check the fuel pressure as I described. If it is only slightly higher than 7 psi you could add a fuel pressure regulator. If much great than 7 psi, the pump is faulty and should be rebuilt/replaced.
Postmaster
Joined: Nov 2002
Posts: 3,447
Likes: 1
From: Littleton, CO
Where was the the 2' fountain spraying from? Have you put an electric fuel pump on there or are you running the stock cranked one? You are definitely getting too much fuel there. Are the floats hanging open ? Did you get the metering valve put in to close that off? Your issue for electric/non-electric whould only be relavant to the choke. We need a little more background...
--Mike
--Mike
Post Fiend
Joined: Sep 2004
Posts: 5,231
Likes: 1
From: Near Fresno, California
The only place in the entire carb where the gas is under pressure is where the line connects to the carb, and the needle boss. after the needle valve, the gas is fed to the different circuits only by gravity - not under pressure.
The problem has to be in the needle/seat area. According to the book, the gas should be at 6/7 pounds where it enters the carb - too much pressure will lift the needle off its seat and flood the engine.
So check your pressure - if it is higher that is your problem. If it is no more than 7 pounds, your problem is with the needle/seat or with the way the float lever holds the needle down.
As to gas leaking from the butterfly bushings - it should not. The only way you could get gas there is for the internal pressure in the fuel bowl to be so great that it forces gas out the idle air bleed and the transfer slot, dumping fuel onto the butterflies. In normal operation you will never have gas there.
It does show that your busings may be worn - which is not so good as it will cause a vacuum leak at that location. Once you get your pressure problem fixed I would look into that problem.
The problem has to be in the needle/seat area. According to the book, the gas should be at 6/7 pounds where it enters the carb - too much pressure will lift the needle off its seat and flood the engine.
So check your pressure - if it is higher that is your problem. If it is no more than 7 pounds, your problem is with the needle/seat or with the way the float lever holds the needle down.
As to gas leaking from the butterfly bushings - it should not. The only way you could get gas there is for the internal pressure in the fuel bowl to be so great that it forces gas out the idle air bleed and the transfer slot, dumping fuel onto the butterflies. In normal operation you will never have gas there.
It does show that your busings may be worn - which is not so good as it will cause a vacuum leak at that location. Once you get your pressure problem fixed I would look into that problem.
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Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
Thanks this is a friends carb and just what i thought worn bushings and bad fuel pump thanks for your time
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Thread Starter
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Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
Originally Posted by Mike G
Where was the the 2' fountain spraying from? Have you put an electric fuel pump on there or are you running the stock cranked one? You are definitely getting too much fuel there. Are the floats hanging open ? Did you get the metering valve put in to close that off? Your issue for electric/non-electric whould only be relavant to the choke. We need a little more background...
--Mike
--Mike
it is a stock pump that runs off the cam ecentric the fountain of gas came from where the needle valve is as we had the air horn off
Post Fiend
Joined: Sep 2004
Posts: 5,231
Likes: 1
From: Near Fresno, California
I am not sure you should be running the fuel pump with the air horn off - I just do not remember how the float valve is secured to the main well housing. Is it possible that the air horn holds the pivot for the floats down?
I do not know - the pictures are not clear enough to see and it has been some years since I worked on a 2150 - - -
take it for what it is worth -
I do not know - the pictures are not clear enough to see and it has been some years since I worked on a 2150 - - -
take it for what it is worth -
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