LML lift pump
- Thread starter SteveFord
- Start date
It depends on your dealer. If your CP4 craters and takes out the whole fuel system and GM has to make the call you will likely find yourself on the hook since a lift pump is a modification to the fuel system. A lot of people will claim they are safe due to magnuson moss act but the reality is that really only applies to certain situations. For example, if your speakers go out they can't void the warranty because of a lift pump, the 2 systems are completely unrelated. If it ended up in court who do you think will win, the oem engineer on the stand that claims the system was modified to supply positive pressure on a system designed to pull a vacuum or are they gonna believe Joe Schmo who installed the pump in his driveway because a forum said so?
If you are tuning your warranty is toast anyways so do it. If you're not tuning leave it alone, there is no need, you aren't gonna drain the rails on stock tune and if the CP4 goes gm is gonna pick up the tab so there's really no point.
Sorry if I seem a bit harsh but generally these threads devolve into someone claiming they have carte Blanche to do whatever they want because of the magnusson moss act without actually understanding its intent or how the warranty process actually works.
If you are tuning your warranty is toast anyways so do it. If you're not tuning leave it alone, there is no need, you aren't gonna drain the rails on stock tune and if the CP4 goes gm is gonna pick up the tab so there's really no point.
Sorry if I seem a bit harsh but generally these threads devolve into someone claiming they have carte Blanche to do whatever they want because of the magnusson moss act without actually understanding its intent or how the warranty process actually works.
I think Steve kinda knows all about the whole warranty deal. He's been at this for a long time.
Steve, Id talk to the dealer. I doubt any of us could give you accurate info. (Maybe KyleC4 could, but he's all I can think of).
Steve, Id talk to the dealer. I doubt any of us could give you accurate info. (Maybe KyleC4 could, but he's all I can think of).
From what I've been told, GM will use absolutely any reason they can to deny warranty. I had a customer with a 2013, that had blown up his CP4 pump, and the dealer was trying to void his warranty because of his cat filter adapter. Other then that the truck was bone Stock. Truck only had 35,000ish miles on it.
If your leaving it "stock", and you want warranty, I'd leave it completely stock.
Sent from my iPhone using Tapatalk Pro
If your leaving it "stock", and you want warranty, I'd leave it completely stock.
Sent from my iPhone using Tapatalk Pro
Well if for some reason I don't leave it stock it will be because you modded it lol!
I'd bet that cat filter was a contributing factor, they don't have any water separation. Just filtration...
Yup, water will kill a cp4 quick.
There are dealerships out there willing to deal with customers and turn a blind eye to some modifications, but if GM sends a warranty agent it doesn't matter what the dealer says.
Sent from my SAMSUNG-SM-G935A using Tapatalk
I have a family member who is contract / GM. He was telling me they send a team out to investigate CP4 failures. He has been on several of those investigations.
He said part of the issue is Bosch, GM going back after Bosch on the cost of a failed CP4, Bosch is fighting every little thing.
A very big part of the reason that GM went away from Bosch fueling on the L5P.
I don't disagree with you necessarily. Just sharing my experience with GM and warranty.
However, I've never once seen water come out of the bottom of a factory fuel filter. I've only changed a couple though..... lol.
Sent from my iPhone using Tapatalk Pro
Someone on DF rigged a Kennedy pump for easy removal. Might be worth looking into if you want warranty and filtration.
Attachments
That's not typically how it works, GM will do the work then send the part off to the supplier for inspection and root cause investigation under a warranty concern. Then the supplier makes the call on whether to fight it or not. More often than not the supplier will bend to the will of the oem even if the issue is not a defective part so as not to piss off the oem. It sounds like Bosch may actually be standing up for themselves.
If Bosch can prove that failures are occurring due to a GM system design flaw e.g. poor filtration, lack of lift pump, etc. They have a case to fight the claims. It does seem the ford 6.7 has a lower failure/warranty rate although I don't have any data to compare the two.
Sent from my SAMSUNG-SM-G935A using Tapatalk
Bosche is on the hook for part of the VW payout, so undoubtedly theyre cinching in other areas i.e. Putting up a fight with GM. Locally at least, cp4 issues warrant a tech line call for directives. Sometimes an investigation and sometimes an approval over the phone
The way the previous comment made it sound was that someone actually showed up to inspect, (me assuming).. Yes they always asked for warranty parts back, CP4s, AFM lifter failures, 3.6 timing chain issues, etc etc. Never had a CP4/fuel system get denied warranty though. (Never did a fuel system on a not factory stock LML though)