Two fuel pumps

Hi,

The vehicle would have come with a mechanical fuel pump and not an electric one. Since you have both, I suspect the lobe in the engine that actuates the pump mechanically failed and the only choice was an electric pump or to take the engine apart and replace things.

Let me know if that helps.

Take care,
Joe

Does a mechanical create enough vacuum to suck fuel once the lines are empty from sitting a long period? I keep truck running for a few minutes by pouring gas in carburetor but it still doesn't supply fuel? I know there is gas in tank I just filled it.
The tank had the same 4 inch diameter opening with electric connectors as my Bronco 2 but with only two wires. I just don't understand how fuel goes up through top of tank then down to the mechanical pump. I guess I will have to set up a gravity flow to mechanical to test it.

How many wires are going to the connections on the tank? 2 wires would be a fuel level sender not an in tank pump. If it has been setting a while the fuel lines could be filled with dried fuel and rust so the fuel cannot get through as a mechanical pump doesn't draw that hard. As it does run I would disconnect the lines from the pump, then use some air to blow through them both. Have someone listen at the fuel filler to see if they can hear air going into the tank. To test the pump you can simply connect a hose to the input and drop it into a gas can. Connect the output to another hose and crank the engine over, it should start pumping withing a couple seconds if the pump is working. If it doesn't it could be a bad pump with a bad diaphragm in it.