hi Mike34,
the complete fuel pump assembly is group 3.900
i checked the GMpartWiki for the years 47-53 which is the generation of trucks i have.
i found only 3 pumps listed, AC-429 -9798 and -9832 for that year range on trucks:
Straight in/out connections:
37-51 ALL, (body casting no. 1523089) (AC.429). 1523429
newer Angle in/out connections for use retroactively on older models:
37-54 ALL, 55 COMM. UTIL. (1st Ser.) (angle outlet)(AC-9798 or AC-9832) 5592627
with
37-51 ALL, ELBOW, inverted flared tube (5/16-20 deg.) 3707972*
*NOTE: This special 20 deg. angle fitting provides for installations of part 5592627 on 1937-51 models without bending the fuel lines.
