Differences between 318 mechanical fuel pumps?

[stu in wichita]

My 74 Challenger has a 1970 318 in it.

I assumed that the fuel pumps were all the same, but several vendors list a different part for the 70 and the 74. Does anyone know what the differences are? Are they interchangeable? Maybe they are physically the same, but different delivery pressure? Port sizes?

Any help will be appreciated. I don't want to get the wrong one.
-Stu

 

[Rob C]

They will interchange. The port sizes should be the same if the listing is for a 318. High performance engines had larger ports for 3/8 lines. But the fittings will still screw on.
I would not be worried. The worst that can happen is that you will need to slightly bend the line.

 

[stu in wichita]

Thanks for the info. It gave me an idea what I needed to look at.

On the early version the pressure port is rotated about 45 degrees, so you're right on the money. I saw a couple of versions that had barb fittings for both suction and pressure.

Thanks for the help.

-Stu