Hey guys, I had a PO171 engine light code for a while now and I cannot figure it out.

mechanic checked the hoses and there' s no vacuum leak. I am thinkin git could be one of the 3:

1- MAF sensor
2- Air filter
3- Fuel Pump

Interestingly, the light only comes up when I refill the car then eventually turns off, and also when the car is really low on gas. Otherwise, I drive it normally without any engine light. does that make me assume it's the fuel pump?

PS: I am trying not to change all 3 of them

thanks

 

What year? What engine? How many miles?

 

sorry I 4got

2007 H3 52k miles on it