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 !

 

[petethepug]

If you haven’t bought it yet, only replace with GM or ac/delco. Both have lifetime guarantees. Generic and import units will only last a year or two and send you on a wild goose chase as they start to fail.

RockAuto & Parts Geek seem to have the best prices and availability on the ones complete with sending unit.

Do yourself a favor and replace the carbon canister while you’re in there. They like to let the carbon pellets out and reign terror throughout the fuel lines after you do the f/p job. Then you get to do it all over again and blow out the lines in the system & swab the tank.