Ok here is the problem i will start my car and it will run fine and just like normal and then about 15 to 20 minutes of steady driving like on a highway with cruise control set my air/fuel ratio gauge will instead of bouncing back and forth u know will steadily drop to the lean area and eventually just go totally lean and will not let my car run anymore so i shut it off when it does that and wait for about 5-10 minutes and start it back up and it will run fine again for about another 15-20 minutes but i have a fuel pressure gauge installed and when it does go lean i have popped my hood and looked at that and the fuel pressure will be a zero i don't think i have a fuel leak becasue like when it runs fine i can shut the car off and the fuel pressure will hold steady at 40 some psi i was jsut wandering what everyones thoughts on this is i was thinking of replaceing my fuel pump but my dad told me if it was my fuel pump it wouldn't run right fromt he begginning so any imput on what i should do would be greatly apprecieated thanks

 

ttt

 

Possible PGM-FI main relay problem. Or the fuel delivery system itself.