Which fuel pump?

[trojan24man]

I have a 2008 5.3 Flex and need to replace the fuel pump assembly. When looking up the AC Delco part for my engine I get 2 different parts depending on where I look(Autozone, Napa, Advance, RockAuto, etc). One has 3 lines(MU2159) coming out and the other has 2 (MU1711). I'd like to figure out exactly which one I need before actually dropping the tank. Any help would be appreciated.

 

[swathdiver]

I have a 2008 5.3 Flex and need to replace the fuel pump assembly. When looking up the AC Delco part for my engine I get 2 different parts depending on where I look(Autozone, Napa, Advance, RockAuto, etc). One has 3 lines(MU2159) coming out and the other has 2 (MU1711). I'd like to figure out exactly which one I need before actually dropping the tank. Any help would be appreciated.

Probably have to look it up by VIN number. If you share it with us we can look or try GMPartsGiant and https://parts-catalog.acdelco.com/acesCat.php

 

[Fless]

Would be good to confirm on the ACDelco catalog and a GM parts website, but what I see on Rock Auto is that the 'gas' pump has three lines but the Flex Fuel one has only two. I would think you need the MU1711.

You could also try using an inspection camera (endoscope) to look at your current pump.

 

[trojan24man]

I input my VIN to the catalog and it pulled up the MU1711. Thanks @swathdiver and @Fless !