I have a quick question?? Just picked up a 1988 for about 1300 dollars. Not in too bad of a condition BUT when I flip between tanks the front tank does not work right. Course I did not find this out till AFTER I filled it. Just curious is your expereinces what is the most common reason for this?? Do you think it could be a blocked fule filter, or the fuel pump itself?? Is the fuel filter in the tank or what?? Thanks