J;
Yes, they were Mfg. by GM and sold by Dealers (as an 'add on') in some areas. They were never installed at the factory because two sizes of fuel lines would be needed.
4 on f;
These (30/40s version) are not filters. They allow sediment (large particles) to drop into the bowel & stay out of the system. There is NO fuel flow restriction involved in there useage. The (smaller particles) are then filtered out by the one in the pump.
They were wrongly put by the carb, to save time and for 'sales reasons' for years. It was just a gimic and a quick buck, "back then"...
Some were placed by the tank outlet and serviced when the vehicle was 'lubed'. We put them in front of the pump where they were easy to inspect/service etc.
Placing one after the fiter is 'reverse order' and creates a hazard.
Happy trails.
