How to Change the Fuel Filter on a Mazda B3000 | It Still Runs The fuel system on the Mazda B3000 includes an inline canister fuel filter. The inner part of the fuel filter canister is made up of a fibered filter. As the gas flows through, the fibers trap impurities from the gas. These impurities include rust, small particles and small debris. Once the 1998 Mazda B3000 Pickup Remove a Fuel Filter - WikituneUp Remove a Fuel Filter . Open the hood of your 1998 Mazda B300 pickup. Remove the black battery cable or the negative charge wire coming out of the car's battery. This will relieve the pressure from the fuel system. Put on protective eyewear because there might be some fuel ejection when you relieve the pressure. Loosen the fuel filler cap.