Why wont my car start? on 1999 GMC Suburban 2500

Turns over although wont fully engage. Battery is 2 yrs old and starter is one year old.

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer 1 comment
Check for spark and then check for fuel delivery. It is either 1 or both.
Thank you for responding. Were would I check for fuel delivery?