Fits GM small block 5.0 and 5.7-Liter V-8 engines 1983 thru 1995. Has provision for vent tube to carburetor. 

Features:
Fuel inlet is at 10 o'clock position
Fuel outlet is at 9 o'clock position
Note: This is always determined by looking at the bottom of the fuel pump with the rocker arm held at the 12 o'clock position.
 
Replaces: Mercury 8M0058164 | 861678A1 | 97401A8 | 97401A2 | 97401
For 1981-95 V8, 180-270 Hp GM & MIE engines.
also crosses with:
OMC 509404
Sierra: 18-7283
GLM: 77113
Indmar: S501003
Mallory: 9-35423