Originally Posted by rx191
the TBI pumps hardly ever fail. i have seen some of them with over 500,000 miles on them. they are good little pumps.
gm MPI pumps from 96 up, those only seem to last 100,000 to 150,000 miles.
the only filter the pump has and needs is inside the tank, that why many of the vehicles don't have a filter after the pump. the only reason it had a filter after the pump was to protect the injectors if the pump began to fail and spread debris in the system.
Unfortunately, this is not entirely correct. That "sock" is not sufficient to clean all the particulate from the fuel, which, while small enough to pass through the pump, can clog and damage injectors, So the GM will have an external fuel filter to catch this. This is what kills pumps. They do not like a bunch of backpressure. If the external filter is restricted, it makes the pump work harder, which generates heat, which, over time, kills the pump. Change the external filter every 12,000 miles or so, and that little tbi pump will last for years.