Btreadway2003

2016 6.0 gas truck wouldn’t start so replaced fuel pump with OEM from dealer. Truck ran great for about a week and then wouldn’t start again. Left sitting for a week while on vacation and came home and it started right up. Now it won’t start again. I have checked all fuses and it’s getting spark. Any ideas on where to go? No check engine light. I was going to check fuel pressure but I am not finding a port anywhere on the fuel lines in the engine bay. thanks for any help!