NASTY VETTE

What is the difference between a stock LS3 fuel pump and a stock LS7 fuel pump?
Many people have told me to upgrade to a z06 fuel pump,when i called GM directly they advised me my car has the z06 fuel pump and they are the same part number. Is that true?

needcheese

just quickly going over to a rock auto parts site. it is showing the same gm part number.

DSOMC6

The LS3 C6's have shared the same pump/module with the Z06 for a number of years now.

NASTY VETTE

Yeah I called GM and Auto Zone and they both advised it was the same part just wanted to ask around to confirm.

Thanks!

C7/Z06 Man

DSOMC6 what year did GM start using the same pump/module for the LS3/LS7?

Seadawg

I'm going to be going into my 2011 soon for a sensor replacement, and to be sure, I'm also having them replace the LS3 pump with a "for sure" LS7 (Z06 fuel pump).

My reasons are: 1.) I want to be "sure" that I have the Z06 fuel capacity, 2.) my sensor is bad, and the pump has the fuel sensor as part of it already (for that fuel tank), and 3.) I have 40+k miles on the car, and it will have a new "for sure Z06" fuel pump in it.

I'll post out here to this thread, if I find different model numbers, when they get into mine.

NASTY VETTE

Ok thanks. But like I said it's the same part number at GM so it's the same part.

old motorhead

The replacement part number is the same. That doesn't mean the pumps used by GM on new vettes are the same.

C7/Z06 Man

Thanks! Also let us know if the numbers are the same, so we know that you did not forget about us!

Seadawg

The technician at the dealer personally confirmed on mine a couple weeks ago that my 2011 GS (LS3 engine) did have a "Z06" fuel pump in the left tank, while replacing my fuel sensor under warranty.

He said I had the earlier (now obsolete) GM part number, which is now superceded by a different GM part number.

GrandSportMan, I bet yours does too.

EvanZR1

This was my understanding as well, that they use a specific LS3 pump and LS7 pump when building cars, but for replacement they only specify the LS7 pump for both.

I may have misunderstood, but that sounds like he confirmed you have the LS3 pump, NOT the LS7 pump. There have been other threads where 2013 owners had theirs checked and they had the LS3 pump.

Seadawg

I'm confirming that my technician told me that my 2011 GS has a part number 19149689 fuel pump from the factory, which is an LS7 fuel pump, at least from all specs I can find, when I double checked them later.

They told me (at the dealership) that this LS7 pump was later superseded by part number 19149687, and that is what they would use today, if it would have needed to be replaced.

I grilled them pretty hard, because I told them that I did NOT want to upgrade later, if I decided I wanted to go for more power in the future. They assured me I had an LS7 fuel pump.......

C7/Z06 Man

Seadawg is there some way to find out about the 2010 GSs? That would be good info which could save a lot of work if I or someone else were doing a supercharger on a 2010 GS.

If the 2013 has the LS3 pump when the 2011 has the LS7 does not make much sense back stepping after changing over, etc.

PS: I know I could try finding out the factory part # from the dealer for the 2010.

Seadawg

It is crazy about what interchangable parts are used on different C6's....I've found several things on mine that are wierd like that, I just found this weekend that I have the larger ZR1 left axle in mine.. I special ordered my GS, with all of the options that help it on the track, I dunno if that played into the parts that put on it.....

On this fuel pump, I had a unique situation, where they were physically inside my tank, and I was going to pay the dealer for the new Z06 pump (with no additional labor). They had the new pump there, so I believe them, because they could have made more money by installing the brand new pump.

BUT, when I install either nitrous or a SC, I'm still also going to install a fuel pressure monitor of some type, because starving for fuel is still my fear, and this is my daily driver.

DSOMC6

For those that have the older 225lph fuel pump assmbly and don't need to drop the fuel tank(s) for repair reasons, I would just run a KB boost-a-pump. I've never had an issue with this set-up and it supports 600rwhp easy.

If you're planning on north of 600rwhp down the road (or dropping the tank(s) for other reasons, you can just add-in another wahlbro 225lph (both pumps will fit in the fuel module bucket). This will support somewhere north of 800rwhp and the cost of the pump is less than $100.

Another option (if you drop the tank) would be just replace the 225lph pump with a wahlbro 400. It's the same size/flow as the Z06, cost approx $125. No need to spend $250+ on an entire fuel module assembly if yours is trouble free.