Fuel lines from pump to carb, 78 620

[mikeanct]

Just like the title says,

previous owner ripped out the stock fuel lines from pump to carb. It is just one rubber line from the fuel pump. Looking for a stock one if anyone has it? I believe it is a set of hard lines with all sorts of hoses coming off of it (and if anyone can direct me to where the hoses go, that'd be great too.) thanks,

Still trying to figure out how to post pics here otherwise I would throw one up.

 

[datzenmike]

Who knows the mind of a previous owner??? Like a lot of things there is a very good reason for the return line. As little rubber fuel line as possible should be used on a vehicle. Specially around the engine. 

 

 

The metal fuel line is basically a U shape with one end connected to the pump with a short hose. The bend at the carburetor has a T with a hose to the carburetor. The other end of the metal U has a pin hole restriction so that the pump can push against it an build up pressure so it can push past the needle valve at the carburetor float chamber. If it was open all the gas would just go round and back into the tank.

 

That restriction allows circulation of cooler fuel from the tank past the carburetor and the over heated fuel back into the tank. On extremely hot days the fuel in the line can actually boil and make restarts very difficult. These bubbles will also be pushed back into the tank and removed. 

 

Here's the other end of the metal fuel pipe with the restriction pin hole...

 

 

 

[mikeanct]

8 hours ago, datzenmike said:

Who knows the mind of a previous owner??? Like a lot of things there is a very good reason for the return line. As little rubber fuel line as possible should be used on a vehicle. Specially around the engine. 

 

 

The metal fuel line is basically a U shape with one end connected to the pump with a short hose. The bend at the carburetor has a T with a hose to the carburetor. The other end of the metal U has a pin hole restriction so that the pump can push against it an build up pressure so it can push past the needle valve at the carburetor float chamber. If it was open all the gas would just go round and back into the tank.

 

That restriction allows circulation of cooler fuel from the tank past the carburetor and the over heated fuel back into the tank. On extremely hot days the fuel in the line can actually boil and make restarts very difficult. These bubbles will also be pushed back into the tank and removed. 

 

Here's the other end of the metal fuel pipe with the restriction pin hole...

 

 

 

So there is nothing coming off of this “pinhole restricted” end? Just a capped end with a tiny hole in it going nowhere?

[datzenmike]

8 hours ago, datzenmike said:

Who knows the mind of a previous owner??? Like a lot of things there is a very good reason for the return line. As little rubber fuel line as possible should be used on a vehicle. Specially around the engine. 

 

 

The metal fuel line is basically a U shape with one end connected to the pump with a short hose. The bend at the carburetor has a T with a hose to the carburetor. The other end of the metal U has a pin hole restriction so that the pump can push against it an build up pressure so it can push past the needle valve at the carburetor float chamber. If it was open all the gas would just go round and back into the tank.

 

 On extremely hot days the fuel in the line can actually boil and make restarts very difficult. These bubbles will also be pushed back into the tank and removed. 

 

Here's the other end of the metal fuel pipe with the restriction pin hole...

 

 

 

 

I mentioned the return line once and the tank twice and what would happen if the restriction wasn't small enough: all the gas would just go round and back into the tank. 

 

 

All L20B have a return line. They run hotter and had restarting and running problems in the heat. Another advantage is the contents of the tank are all run through the filter so crap does not get a chance to collect in the tank.