Fuel line question

[Bigfoot]

Must preface by saying, that I am not much of a mechanic at all:

The fuel lines on my 451 Massey, where in bad shape. I decided to change them all. Good thing I did, some cracked just moving them with my fingers. Wish I could post a picture. The line running to the lift pump T's, and then runs directly to the line coming from the lift pump. I changed that line, when I changed all the others. Tractor runs fine, but ran good with leaky fuel lines to. Mostly to satisfy my curiosity, why would a line from the input side, bypass the pump, and intersect the output line?

 

[cfpinz]

A picture would be great, as I'm having trouble following you.

Is there a pressure regulator downstream somewhere?

 

[dieselbeef]

press return line

 

[Bigfoot]

A picture would be great, as I'm having trouble following you.

Is there a pressure regulator downstream somewhere?

Not that I have seen.

 

[Bigfoot]

press return line

That sounds plausible. Would all Diesel engines do that?

 

[D2Cat]

There must be a check valve in the line, or it would just bypass around the pump. The return line comes from the injectors, and is fuel the injectors don't use. Return line is low pressure and usually returns to the fuel tank.

 

[Bigfoot]

Thanks for the replies. I hate a Diesel engine with a passion. Even simple minded me can rebuild a carb, and change points.

 

[D2Cat]

Once you figure out how simple a diesel really is you'll change your mind! Fuel, air, compression and no air in the fuel.