Ok gonna replace the fuel pump , how do I know which pump rod I have? what are the two lengths for the short or the long one?

Note: The fuel pump used with an alternator uses a 4" pushrod. The fuel pump used with a generator used a 4-1/2" pushrod. However, to make it more complicated SOME 15 degree-angle pumps can have the lever/arm way up in there and actually need a 4-1/4" pushrod. Make sure you have a pushrod of the correct length for your system.