So on my '74 C10 I just replaced the dirty fuel filter with a new one thinking that there was crap either in the tank (Tank is brand new) or the lines but as it turns out, tank and lines are clean. I also replaced the fuel pump, reason for that was that at first start up, the fuel filter fills up with gas then slowly empties out and only trickles in. Is this normal? the truck idles fine and drives fine, I just found it odd that the fuel filter is not always full of fuel matter of fact there is only about a teaspoon of fuel if that. Should I worry that something is about to fail?
Fuel pump is mechanical.