will fuel pump from auto zone work on 79 ford ranchero 5.8

It will as long as you make sure of your engine, 5.8W or a 5.8C

Make sure it's swimming in gas before you initially start it , Gas keeps the pump cool and if it's a P.O.S. auto zoo part put a religious icon up on the dash board for good measure

The fuel pump is old school, it’s mounted on the side of the engine, so it’s not soaked in fuel. However I did forget to mention that make sure it is an E10 pump. Not some NOS part they had laying in the back.

Site error

Opps , Hope the lobes aren't worn of the cam

Nope those had a little eccentric that mounted to the front of the cam gear.

Yes, it's a mechanical fuel pump and you need to know if it's a Windsor, Cleveland, or Modified Cleveland engine. With emphasis on YOU need to know!! The 18 year old counter person will have absolutely no idea what you're talking about and God help you if you tell them it's a V8 351. This is one situation, when dealing with an older model, that you have to know the answers and possibly even the part number to get the right part! If possible, deal with an older (50+ year old) parts guy on this!! Hope that helps! Jim