Yes you can get to the fuel pump from under the car. Sometimes it's a bit tough to get back in. It depends on the location of the excentric that the fuel pump lever rudes on. You can bump the starter to rotate the excentric on the end of the cam at the timing gear. If you can get the excentric on a low spot you take some of the pressure on the pump lever and the pump is easier to bolt in place. To check the fuel pump before replacing it disconnect the fuel line at the carb and put the end into a bottle of some sort. Crank the engine and you should see fuel squirt out of the hose into the bottle. If not your pump is shot.
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