Nearly 30 years of obsessively cataloging, photographing, and taking video of each part means it will fit your 2003 Mercury Mountaineer 4.6L Engine - Models from Production Date 12.10.2002 Fuel Pump Assembly.

Period. No Hassle. GUARANTEED.

We cover round trip shipping if we make a mistake.

Check out the video below to view the Guaranteed Exact Fit process from start to finish!