biged503

Well its been at the dealership for three days . I stopped by yesterday to check in and they couldn't get it to do it. I had them grab the keys and within 6 minutes it was in limp mode. Irritating anyway we turned tuner off and of course the emission codes popped up but also a low fuel pressure came up. So today there testing pump to see if its bad. At least they have something to get started with.

biged503

Well I dropped it off Mon and Wed I stopped in to check on it and they said"we cant get it to do it". So the manager grabbed the keys and "we" went for a drive 6 min into it were in limp mode. Shut tuner off and still limping but it did finally pop a low fuel pressure code. They tested my pump and luckily it tested OK then they ran a few other test and nothing. They called fri evening and asked if I wanted it for the weekend. Uh no thanks so they have a couple more tests to run so hopefully tomorrow something happens. Its prob the new fuel rail that they screwed up and had to install new one and then sent truck back to me twice with diesel pouring out. Two trips back to dealership on tow truck. Sure seems odd that it started after all of the fuel rail problems they had.

biged503

Well there claiming its my lift pump. It flow tested good but every time you touch the gas it shows a huge amperage drop. They are 100% sure its the pump. Of course they want $700 to fix it. Im going to try and get it home today and fix it this weekend. I can get a new pump for $214 just sucks I filled the pickup up right before I took it in. Any suggestions on whats easier draining the tank and dropping it or lifting the bed and leaving the tank alone? I think I can get enough diesel cans from my employer to empty. But the shop im using has electric hoists and about everything a guy would need to do both ways ive never done either but both look fairly simple just time consuming.

xcc_rider

If you've got the hoist Id say pull the bed.
Not that much too it unless you have a shell on it. You'll need a BA torque socket for the bed bolts, disconnect the electrical and fill nozzle and it lifts right off.
Then you can do the fuel tank vent mod while you're there. Simple mod, some hose, a T and a cheap fuel filter vents the tank with clean air not dirt and water.

biged503

Well $400 later pulled it in a buddies shop put it on the lift hooked a couple ratchet straps around tank and dropped it. It was actually pretty easy alittle messy but easy. I was in limp mode before I got it home.So I will swing by dealer today and see how good there "its 100% your lift pump" quote was. Pretty sure that was a wasted $400 The code is "low fuel pressure delivery" but im not sure where it reads that at? Did dealership leave a piece of Teflon tape dangling in my fuel rail when they were trying to seal it up? Or is this between my low pressure pump and high pressure pump? Or is it right before injectors? Trying to get a little info and knowledge before I go in. $400 at Christmas for absolutely nothing im a little ****** off atleast would like to try to sound like I know what im talking about before I go in there and start choking necks. Im still saying the screwed something up on my rail

xcc_rider

You can splice in a T between the filter and cp3, add enough tubing to get it to your wipers and zip tie a 0-30 or 0-20 pressure gauge there and watch to see if it drops below 5psi when it goes into limp mode. Should cost you $30 to do and will rule out the cp3 fuel delivery issue.
BTW, the fuel delivery code is a calculation the ecm does. There's no sensor.

Do you know anyone with an edge CS or CTS? Its a plug and play gauge system that plugs into the obd port. Borrow one, set it up to watch the rail press and go for a drive and see if it limps.

If its rail press then it could be the cp3, fca, fprv, injector tubes, excessive return rate or possibly a sticking injector.

It sounds like they've had a hard time getting the inj tubes to seal properly if you returned it twice with fuel pouring out at the rail. Look at your invoice and see if they used new tubes when they did the head work. Find out exactly what was leaking on the rail both times.

biged503

Thank You xcc for your replies. I went and had a good talk with the dealership today. I called bs on the pump and then ran into the mechanic and after talking to him the service manager came in and we talked. And I find out the pop off? that comes attached to the rail not the one you can replace.When tech ran all the tests this one had a glitch but with my amperage drop he was sure it was pump so after all this three month bs they warrantied the new rail and are waiting for it to come in so they can replace the new one with a new one. So we will see but I do have a code scanner I borrowed that I can drive with and moniter all my pressures rpms so on. At this point other than being ****** that I found out they had a bad read on the rail im waiting for the rail if that doesn't work I will have to diagnose myself I guess.Every one have a Merry Christmas.

xcc_rider

I'll keep my fingers crossed.

Seems to be a lot of rail pressure problems on the forums. Its given me the incentive to be more edjumacated on the fuel system, so more reading and research is on my to do list.

Hope it all works out for you.

biged503

well they changed the fuel rail and no help. Same limp mode "low fuel pressure delivery" code. So they called Chrysler and talked with them and they suggested changing some part to check it. I picked up the flu so when they called I was out of it and cant remember what he called it. But he said they have same year pickup on lot so they are going to pull this part out of other pickup and install in mine and see if it makes a difference before they get a new one and install. Not till mon or Tues of course but there still trying.

JP-4.5

Have you been watching your oil level? Be sure you are not making crankcase oil by a fuel leak.. Connector tubes and -orings can leak diesel into your crankcase. This will cause fuel rail pressure issues and also engine problems if you continue to dilute your oil with diesel. when I did my head gasket I thought connector tubes were fine to reuse and had issues getting them to seal up properly. Replaced tubes with new ones and truck ran great after installing new tubes. Not sure if the tubes are your issues but wanted to point out they can affect how the truck runs.

Hope you find your trouble promptly.. Jeff

biged503

jp-4.5 so was there any signs other than crank case level increasing? they called me today and said come grab it but they wanted me to drive it for a few days. They replaced the fuel something solenoid thought they had had it fixed but wanted me to drive it. First time in 4 months drove for 18 miles and nothing small hill before my destination and knew it would ding and nothing. 4 hours later heading home pretty stoked 8 miles boom info center dinging. Same **** but this time it doesn't feel like limp mode still has power still goes when you peg it.dinged 4 more times in 10 miles but didn't notice any power loss. Checked with scan tool same code "low fuel pressure delivery" popped hood checked oil appears to be quart maybe two or so low. it has never been low ever! Always same read from the time I change it till I change it again.It sat for 30-45 min before I checked it I don't know what to do something has changed before it was limping in 1/2 mile so don't think they fixed anything but it is running different HELP

JP-4.5

No other signs other than physically checking level. I could see the oil level rising on the dipstick within a couple hundred miles of driving truck. Truck ran fine.

Another thought.. If it was me I would be checking every wire connection. Take connection apart, look and be sure they look like they are going back together correctly.

On my truck I plugged the rail pressure gauge connection on backwards once. The gauge stopped working properly and truck threw several codes affecting other sensors on the same bus. Your 2007.5, I assume has some additional connections than mine so I have no history if something could be connected to wrong sensor, poor or even backwards.

Best of luck finding your trouble..

biged503

Dealership called Star/Chrysler they said to start capping off injectors one at a time and monitor to see if one is bad and if they all check out OK prob high pressure pump they say. Im don't spending big money on guesses. So in the process of talking to salesman to trade off he said before I trade buy a pressure overflow cap to plug it off. He said try that if it works then get a new one if it doesn't he will buy my block-off and ill trade it off. So one more try and if it goes into limp mode its gone. Hate to I love my pickup but this has been going on for months. Anyone have a diagram of where the overflow valve is? Everything I find is for 2007 and older I cant find pic for 2007.5. I think I know but not positive.