I have a 2003 mazda tribute with a 6 cylinder engine. It will not start in the morning but will start up in the evening. I dont understand this. I replaced the inline fuel filter 4 days ago. Is it the fuel pump that is the cause of all my pain?

i do not think that a fuel cleaner additive will help --BUT-- you never know this is one of them catch 22 type situations where you kick it up the exhaust and swear at it in japanese and then it works for ever after ,if i had it in front of me and tried it myself in the morning i would no doubt sort it out ,but as you appreciate that with anything mechanical combined with electronics is a disaster area for fault finding i do not think that a fuel cleaner additive will help --BUT-- you never know this is one of them catch 22 type situations where you kick it up the exhaust and swear at it in japanese and then it works for ever after ,if i had it in front of me and tried it myself in the morning i would no doubt sort it out ,but as you appreciate that with anything mechanical combined with electronics is a disaster area for fault finding