Walbro GSS342?

[03Sierraslt]

I need a high flow pump for my Denali, It is a 04 with the in tank pump. My first impression was that I needed the Walbro 340 however after talking to different vendors everyone is saying that I need the 342? Any input on this? Is the 340 for the return fuel sytems where as the 342 is for the returnless like mine? I just want some input before I order it today. Thanks

[bud8fan]

my truck has the 340...the 341 and 2 are for the suv's i think