[tomtom11]

hello, i think my lpfp is on its way out the door. since i have downpipes i am worried that when the dealer takes my car they will drive it around and a code will appear. i have seen many posts and threads about people saying to take the tune out for a dealer visit, but what about taking the tune out but leaving in the dp fix. is the dp fix visibile once installed? i just ordered it so i'm a noob when it comes to the dp fix sorry. let me know your thoughts

[brewnami]

The DP fix is not visible when installed unless you open the cover for the DME. I don't know how much digging around the dealer will do when diagnosing what you think might be the LPFP. In order to take the tune out and leave the DP fix in, you will need to uninstall the DP fix from your tune (if you're using JB4) and reinstall it into the factory harnesses. At that rate, you are much more likely to get spotted for having downpipes as they make a big difference in the sound of the car and are clearly visible if they were to go under the car. Unless you plan on putting your car back to stock to have them change a cheap pump that is very easy to DIY, I would leave the tune in, set to map 0 and leave as is.

[tomtom11]

thank you for the reply. as i just said i just ordered the dp fix so it is not attached to my jb4. when you open the dme the jb4 is clearly visibile. if i take the tune out but attach the dp fix inside the dme, if the dealer removes the cover will they be able to visually see it like they would the jb4, or is it more burried in there and only 1 wire so its not visibe even when just opening the cover?

[Myrder]

why not just order one of the kits out there to upgrade your LPFP?

[tomtom11]

because i figured it would be better to replace the dying pump instead of adding in another pump to use as a band-aid fix.

[tomtom11]

but regardless the question is still the same whether i decide to go with an aftermarket pump or not because i will still go to dealer another time i am sure with tune out and want to know if the dp fix is visible

[C.Pop]

In my biased (yep, biased) opinion, pick up SteveAZ's stage 2 kit. IMO in-line options are not ideal for a variety of flow/system/basic engineering reasons, although I admit they work. Replace the pump with a nice high performance single motor pump and never look back. It is more expensive than letting the dealership do their thing but IMO it's worth it. Buy a good solid, well engineered and thought out upgrade, and right now it is painfully clear that his kit is the only one that meets that description.

By the time you are done dicking around with dp fixes, the dealership/etc you'll not be that much different in cost to you if you value your time (or if you're short on it). BTW, the stock pump will probably do just fine on the stock tune, so they'll "test" it (whatever that means to the tech on your car) and it'll most likely meet target pressures, they'll tell you it's fine, and you'll have wasted your time fooling around with DP fix, tunes, scheduling the dealership visit/etc.

That said, to answer your question, leave it on. The chances of them opening your ecu box are lower than the chances of them test driving it and seeing the service engine light come on. Once that happens and they scan, they'll find the downpipes/etc. Game over.

[tomtom11]

Originally Posted by C.Pop

In my biased (yep, biased) opinion, pick up SteveAZ's stage 2 kit. IMO in-line options are not ideal for a variety of flow/system/basic engineering reasons, although I admit they work. Replace the pump with a nice high performance single motor pump and never look back. It is more expensive than letting the dealership do their thing but IMO it's worth it. Buy a good solid, well engineered and thought out upgrade, and right now it is painfully clear that his kit is the only one that meets that description.

By the time you are done dicking around with dp fixes, the dealership/etc you'll not be that much different in cost to you if you value your time (or if you're short on it). BTW, the stock pump will probably do just fine on the stock tune, so they'll "test" it (whatever that means to the tech on your car) and it'll most likely meet target pressures, they'll tell you it's fine, and you'll have wasted your time fooling around with DP fix, tunes, scheduling the dealership visit/etc.

That said, to answer your question, leave it on. The chances of them opening your ecu box are lower than the chances of them test driving it and seeing the service engine light come on. Once that happens and they scan, they'll find the downpipes/etc. Game over.

thank you for the reply. i have been running the jb4 for like 3 years and logs have looked good the whole time. now my timing and everything is way off. somebody (reliable source) told me based on my logs that my lpfp is dying. if they tested it now I would think they could see its dying because when it wasnt dying i had perfect looking logs.

[C.Pop]

Originally Posted by tomtom11

thank you for the reply. i have been running the jb4 for like 3 years and logs have looked good the whole time. now my timing and everything is way off. somebody (reliable source) told me based on my logs that my lpfp is dying. if they tested it now I would think they could see its dying because when it wasnt dying i had perfect looking logs.

Gotcha.

The problem is that a dying lpfp doesn't always show its face until you're at high load, and you aren't going to be at a real high load until you're tuned. In other words, unless your lpfp is really near death, it'll probably still support requested pressures on a stock tune just fine. It's the tuned maps that have MUCH greater fuel demand that will show the weakeness of the lpfp. This can make it tricky to get it replaced under warranty.

[ZTZ1010]

not sure if this has been mentioned but AFAIK per Terry you're not supposed to drive around with the DPFix and JB4 active as it can alter O2 values which in turn negatively impacts performance and tuning safety. Essentially it's only intended to be a temporary device installed for short periods of time.

[tomtom11]

Originally Posted by C.Pop

Gotcha.

The problem is that a dying lpfp doesn't always show its face until you're at high load, and you aren't going to be at a real high load until you're tuned. In other words, unless your lpfp is really near death, it'll probably still support requested pressures on a stock tune just fine. It's the tuned maps that have MUCH greater fuel demand that will show the weakeness of the lpfp. This can make it tricky to get it replaced under warranty.

this is very very helpful information that I was curious about. maybe I should do a map 0 log and see if the fuel pump is still having problem?

[tomtom11]

Originally Posted by ZTZ1010

not sure if this has been mentioned but AFAIK per Terry you're not supposed to drive around with the DPFix and JB4 active as it can alter O2 values which in turn negatively impacts performance and tuning safety. Essentially it's only intended to be a temporary device installed for short periods of time.

yeah i have hear it messes with the AFR and stuff and won't use it for a long term solution. thank you for the information

[C.Pop]

Originally Posted by tomtom11

this is very very helpful information that I was curious about. maybe I should do a map 0 log and see if the fuel pump is still having problem?

That's a great idea. If your lpfp pressures look good at stock boost... it's gonna be a hard sell to the dealership that you need a new lpfp.

[brewnami]

Honestly, I wouldn't be concerned about the dealership seeing the DP fix. Unless the service techs are retarded, they are going to notice you have aftermarket downpipes. You don't even need to look for that mod, its clearly audible. SteveAZ also sells new OEM LPFPs coupled with an inline walbro and its 100% plug and play. There are a few options for you that will probably work out better for you in the long run and save you the hassle at the dealer, but this is coming from someone who doesn't have a warranty haha.

[tomtom11]

I was seriously considering going with one of the SteveAZ pump, but i dont know how that effect warranty. does having an inline pump through codes or anything that would allow them to know I had an aftermarket pump installed?

[Miller335]

At some point you're going to have to make a decision.

If you want to be modded it means you're going to have to forgo taking your car to the dealer for small things and either learn how to wrench or pay someone to fix small things.

IMO this is such simple issue and you are making it difficult worring about a warranty.

Just order steve kit with new LPFP, in line follow the instructions and move on with life.

If things like this make you woRey about what the dealer says you may want to go back to stock.

[C.Pop]

Originally Posted by tomtom11

I was seriously considering going with one of the SteveAZ pump, but i dont know how that effect warranty. does having an inline pump through codes or anything that would allow them to know I had an aftermarket pump installed?

I would go stage 2. His inline is nice of course, but the stage 2 is, in my opinion, a more complete package. All of his packages will flow more than you need with your mods or quite a few more mods than you have, but I like the engineering & thought behind using an in-bucket walbro 450 pump in lieu of a series pump configuration. For what it's worth, the in-bucket config looks a lot closer to stock in the extremely highly unlikely event that the dealer looks in your fuel tank.

[montegokid94]

Your DP are not related to the fuel pumps why are you worrying so much? And why are you trying to leave the dp fix on?????

I told any dealer I go to I have xyz mods and every time the response is unless the mods caused the problem we don't care about them.

So you tell me how your dps caused your lpfp to fail?????? That makes no sense whatsoever.