You will want to be cautious of that minute rust. Generally, the in-tank filter of the military jeeps will not stop that from entering the system. The particles will collect in the fuel pump, get caught up in the check valves and cause the pump not to work, or more likely they get caught up in the needle valve and cause the carb to flood.
The most telltale sign of this is when you come up to a stop sign, the jeep suddenly idles funny then quits. The only way to get it to start is to turn off the fuel until it runs again, then turn on the fuel and go. If you open the top of the carb, you will see the fine particles in the float bowl.....the telltale signs of a rusty fuel system.
An inline filter either right at the carb or just before the fuel pump will usually cure the problem, but do expect the fuel filter to plug up fairly regularly.
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