I know the stock gm pumps are junk in trucks and cars... my pump is getting very loud after it runs about 30 min or more and i am going to replace it soon..... any sugestions on after market pumps that work well and are dependable?

 

Most run the 255lph pumps...

I think one's made by Granatelli and the other by Racetronix.

 

Do the aftermarket pumps go inside the tank like factory, or are they external in-line pumps?? Just curious.

 

either or, they make both. racetronix and walboro have the in-tank, while someone on here mentioned a in line one with a ridiculous output (something like 500 lph)