By having your system serviced every 6 months, every year, … maintenance, you can be sure that your supplies will come up to par with your tank capacity. Internal filters are replaced so your pump will run more smoothly.
A tank installation is an open system. The fuel you pull out of your tank makes you pull in air. This air may contain dirt/sand ed. This sinks to the bottom of your tank and/or gets sucked back in with fuel you fill up in your vehicle. The internal filter will stop the biggest debris.
Other prefilters are highly recommended by BRAFCO