The date code should be stamped into the pump reservoir somewhere near the filler neck.
"STAMP THE DATE THAT THE PUMP IS TESTED ON THIS SURFACE OF RESERVOIR NEAR FILLER NECK.
000XX0
000 DAY OF YEAR (1 thru 365)
X ASSEMBLY STATION (L or R)
X ASSEMBLY SHIFT (A, B, or C)
0 LAST DIGIT OF THE YEAR (6 for 1966, etc)"
"STAMP THE DATE THAT THE PUMP IS TESTED ON THIS SURFACE OF RESERVOIR NEAR FILLER NECK.
000XX0
000 DAY OF YEAR (1 thru 365)
X ASSEMBLY STATION (L or R)
X ASSEMBLY SHIFT (A, B, or C)
0 LAST DIGIT OF THE YEAR (6 for 1966, etc)"