most modern vehicle fuel pumps do not have diaphragms. there are three primary designs:
turbine gerotor (nippondenso, walbro/ti automotive, bosch, magnetti marelli, maybe delco)
gerotor (walbro/ti automotive)
roller vane (delco)
gerotor and roller vane pumps can chew through decent amounts of contamination, while turbine pumps are typically more sensitive. fuel pumps normally have a filter or screen on the intake end to prevent large chunks of contamination from entering the pump. to replace this filter typically involves replacing the pump as well.
if you look at your inline fuel filter and it is full of crap, it might be wise to drop the tank and check the fuel pump as well.
turbine gerotor (nippondenso, walbro/ti automotive, bosch, magnetti marelli, maybe delco)
gerotor (walbro/ti automotive)
roller vane (delco)
gerotor and roller vane pumps can chew through decent amounts of contamination, while turbine pumps are typically more sensitive. fuel pumps normally have a filter or screen on the intake end to prevent large chunks of contamination from entering the pump. to replace this filter typically involves replacing the pump as well.
if you look at your inline fuel filter and it is full of crap, it might be wise to drop the tank and check the fuel pump as well.