My 1970 IIA has been stalling out/refusing to re-start when hot. I installed a shielded fuel line but that didn't solve the problem so today I added a clear fuel filter near the carburetor (Solex 36IV) to see how much fuel was getting to it. I was surprised to see that it's really a trickle. I know that's not a scientific measurement but is that normal? I didn't see much variation as the temperature rose, but I didn't want to drive it until it stalled because I'm tired of being stranded in intersections. I have an old Purolator electric pump. Could the pump be the problem?