The Car: 1968 S2, 1500 pre crossflow, single weber, mechanical fuel pump. The engine stopped out of the blue, symptoms similar to running out of fuel. Bonnet off and glass inline fuel filter located between the tank and the pump was empty. Added some fuel (but actually the tank was found to be almost full) and the car started and ran for a mile or 2 before the same thing happened. I suspected dirt in the tank/fuel line preventing the fuel from reaching the filter and pump. Back in the garage, after cleaning the fuel lines and replacing the filter I try again, fuel is pumping OK (with the fuel line into carb disconnected) but no hint of firing up once connected to the carb. Lots of cranking, plugs sparking but dry. I now suspect a failing weak fuel pump or some sort of block in the carb. But this wouldn't have caused the empty filter. I think i will replace the pump next (as this is a simple swap and I can rob the project car of a good pump).... Thoughts?