I had a bad fuel pump on my 235(busted inside or something).Bought a replacement from parts store(Webber brand)but it wont pull the gas from the tank to the carb.I have a new chassis mounted tank,fuel lines,and inline filter going into the carb.When you try and drive the truck you have to keep the choke about half for it to run without stalling.An old gent told me the lobe on the cam could be worn to the point it wont give full travel on the pump lever. Any ideas?

JMH