hmmm,
take the fuel pump out, but keep it connected to the fuel lines, (except the line that goes to the carby) then pump it with your hand. to see if you can operate it and get fuel to come out of the top.
if it doesnt work then u know thats ur problem
you can get pumps from most wreckers as ke70's are fairly common,
when i got one for my 5k a while ago, same pump. was 25$ from the local one.
ther are 2 kinds for k motors, once iwth a return and ones without
just get the right one for your car.