Dear All,
I have a Fiat 500F which I had upgraded to an "Abarth". Part of the upgrade was to put in a Fiat 126 engine (the 650CC).
Recently I had a problem with the fuel system. It appears that the carburetor for the 126 had a fuel return system. For my 500 there is no such line. So the installer simply put a rubber house on the return coupling and closed it off. This seemed to work okay for about 10 years. However, the coupling became loose and leaked fuel. I had the carburetor rebuilt and had this coupling plugged up.
Now I have a problem with the fuel pressure. The fuel pressure should be about 3.5PSI. I think that my fuel pump is producing more than this. So the car starts up and runs fine for about 10 minutes. Then, when the fuel system is full, there appears to be too much fuel going into the carburetor.
The shop that overhauled my carburetor told me that if this occurs, I might need to install a fuel pressure regulator downstream from the fuel pump. Has anyone had a similar problem? Any idea of what model of fuel pressure regulator I might need? Any clues on how (and where) I should install it?
I heard that there is such a fuel pressure regulator that was originally for a Chevrolet that might work. It was my impression that I would have to cut the fuel line (rubber) insert the fuel pressure regulator, clamp it down and dial it to 3.5 PSI.
many thanks
Robert
Cheech67
I have a Fiat 500F which I had upgraded to an "Abarth". Part of the upgrade was to put in a Fiat 126 engine (the 650CC).
Recently I had a problem with the fuel system. It appears that the carburetor for the 126 had a fuel return system. For my 500 there is no such line. So the installer simply put a rubber house on the return coupling and closed it off. This seemed to work okay for about 10 years. However, the coupling became loose and leaked fuel. I had the carburetor rebuilt and had this coupling plugged up.
Now I have a problem with the fuel pressure. The fuel pressure should be about 3.5PSI. I think that my fuel pump is producing more than this. So the car starts up and runs fine for about 10 minutes. Then, when the fuel system is full, there appears to be too much fuel going into the carburetor.
The shop that overhauled my carburetor told me that if this occurs, I might need to install a fuel pressure regulator downstream from the fuel pump. Has anyone had a similar problem? Any idea of what model of fuel pressure regulator I might need? Any clues on how (and where) I should install it?
I heard that there is such a fuel pressure regulator that was originally for a Chevrolet that might work. It was my impression that I would have to cut the fuel line (rubber) insert the fuel pressure regulator, clamp it down and dial it to 3.5 PSI.
many thanks
Robert
Cheech67