Steps 1 Purchase the replacement filter. 2 Locate the old filter - it may be in the engine compartment or under the car in the fuel tank. 3 If recommended by manufacturer follow procedure to remove fuel pressure. 4 Unscrew each hose clamp bolt until it nearly comes apart from the nut. 5 Push the clamp up the hose. 6 Remove the old filter and replace with new filter 7 Push clamps back down and tighten them. 8 Run the engine and check for leaks.