Maybe there are outgoing filters on the tankers to reduce what goes into the stations holding tanks. Alot of bigger stations have filters in the actual pump area that they change every month, but not all stations do. And where I live, I seriously doubt they have filters...

 

Yea i know not all of the stations have filters, but i just recently talked to a guy who delivers gas for sheets, he said they have filters on the pipes when he fills up his tanker, filters on the truck when they unload the truck, and filters in the pumps at the station, he said he always gets asked if he has started filling the tanks up yet, and he always tells people it doesnt matter, because they have many filters

 

Here's the fuel pump assy:


And here's the separate fuel pressure regulator:


When I rebuilt my engine I send the old pressure regulator to someone I knew who worked at the plant, in Iowa, that manufactured them. In return for my old regulator he sent me two right off the assy line. The technicians wanted to see what one "from the field" looked like after years and miles of service. I have a picture of it somewhere. The inside was dirty, as if someone had filled it with coffee grounds yet it was still within specs pressure-wise. That's good, right? Not really since three of the eight injectors were plugged on the inlet side and there was a lot of junk partially plugging the fuel injector rail.

 

So the filter in these fuel systems is internally in the pump?

 

Look at the base of the picture I posted. There's a screen (aka sock) at the bottom, which is the direction of the fuel flow. IIRC, there's another screen inside from there, and finally the pressure regulator. Last time I priced a pressure regulator, it was $15. It's a PITA to change with the tank in place, but it can be done.