RayBo;
Unless you have a gray market truck, you would have a FO3 or a FO5 UL approved fuel system and it wouldn't be the Nikki. If you can identify the serial number this would help. Is the truck a P40 produced before May of 1988 or after? Does the truck have a cyclone air filter? If you are working on a vehicle that was made for the North American market (USA or Canada) you have an Impco VFF 30, model 100 carb and a model J regulator.
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