Here is an excellent photo of the two valve fuel pump used on CCKWs up to 1945 when the 6 valve fuel pump took its place.
While it is also know as and AC type AF fuel pump, they are not the same as you would see on a jeep (although they also use an AC type AF pump).
This picture is from the September 1945 edition of Army Motors
Four things to note:
1. Metal pulsator/fuel bowl. Some very early CCKW manuals show a glass pulsator/bowl, but after 1941 all the TMs show metal.
2. Primer arm is on the LEFT side of the pump. Also note that the head of the hollow shaft rivet is on on the primer arm side. A person looking to fake a CCKW fuel pump may miss this little bit.
3. The bale is perpendicular to the engine. This is another item that separates the CCKW pump from say a jeep one.
4. THerea re two holes in the primer arm, the one at the tip is larger than at the bend.