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there could be 2. one is in the tank,this one is there for sure. the other is in the frame rail ahead of the switching valve,if you have 2 tanks.Otherwise look for a cylinder with fuel lines and 2 wires.the fittings on inline fuel pump might take a special tool,they will look like a bell.that tool can be bought at parts store, should be under $15.
If you have the fuel injected 460 with tfi module on the distributor have it replaced[ I did after replacing all my fuel pumps,plugs and wires].All you need to do is have it replaced $50 part half hour labor
The fuel pump inertia switch that shuts off the pump in the case of an accident or impact is located under the right side of dash I have also
found them behind the right kick panel. There is also a fuel pump
shutoff relay under the hood on the left firewall, and a relay on the
right fender apron behind a plastic cover. Hope this helps.
Theres 2 pumps
one in the tank, lift pump, and one in the chassis rail under the driver side.
The one in the tank is cheap, the one in the rail is not.
The one in the tank only produces low pressure to prime the main pump and if it is broken, may not cause that much of an issue except when starting. the one in the rail is a no-start if it fails.
The idea is that the rail pump can supply high pressure for the injectors, so a fuel pressure test at the injector rail will determine which pump is playing up.
Hope that helps