lift pump question

Rodeo man

Member
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 rhem all. Good thing I did, some cracked just fiddeling with them. 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 curosity, why would a line from the input side, bypass the pump, and intersect the output line?
 
Kinda sounds like you're talking about the fuel return line, but it would be nice to know what engine & tractor you're talking about
 
Only thing I can think of is the designer didn't want the full supply pump pressure to the inlet for whatever reason. Some Cummins CAV DPA pumps have the pump inlet and return lines teed together right at the pump, with a small orifice air bleed fitting on the top cover. Lots of older AC, Ford, IH, MF, MM, and Oliver engines don't even use a supply pump..
 

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