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05 3500 Fuel System
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It's time to cast your vote for March's Cummins of the Month!
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What is the code that it is showing?, a wild guess from the little info so far thinks it may be your FCA (fuel control actuator) that is located on the back of you CP3 high pressure fuel pump (it has the wires plugged into it).
I would suggest getting rail pressure gauge, and also a fuel pressure gauge to help with the diagnosis, as these two can help pinpoint a multitude of issues you have, or may have in the future.
I would suggest getting rail pressure gauge, and also a fuel pressure gauge to help with the diagnosis, as these two can help pinpoint a multitude of issues you have, or may have in the future.
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290 Posts
You really need to find out what your actual RP is. The RP sensor, which is on the top of the rail with the wire attached are known to fail, and can give false readings, telling the ECU one thing when it is actually getting the correct pressure from the CP3, causing your truck to throw that code, a rail pressure gauge will tell you if this is your issue or not. Or you could just swap out the sensor, they are not that expensive if you don't buy them from the dealership
. Of course, just swapping parts does not guarantee that it will be fixed. If you do go for swapping parts I would go for the pressure sensor, followed by FCA, with the only other thing it could be last which would be your CP3.
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When I first drove the truck home last year, what I believe is the same sensor you are talking about was loose and sprayed fuel all over the engine compartment. At the time I tightened it and that was it. I have not had any other problems. Of course I have not put a lot of miles on it sense. Maybe 6k
I assume that FCA is a designation of the sensor. I have dealt with Genos Garage in the past and I believe they have the sensor. I'll check it out.
Next question: Is it a problem to drive the truck with this code on? I need it this weekend and it will take at least a week to get a sensor. I'll check into a gage at the same time.
I assume that FCA is a designation of the sensor. I have dealt with Genos Garage in the past and I believe they have the sensor. I'll check it out.
Next question: Is it a problem to drive the truck with this code on? I need it this weekend and it will take at least a week to get a sensor. I'll check into a gage at the same time.
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The pressure sensor can be bought from Genos garage ($200), along with the FCA($160).
i bought my rail pressure sensor from TC Diesel, he had some used ones that were good, you might want to give Todd a call there, as I got it for much cheaper than a new one.
As to whether you can still use you truck, your fuel pressure relief valve on your rail should protect your system, BUT, these can only operate so much before they give out, and then you will need to replace that too (TC Diesel for this). If I were in the same position as you, I would use it only if you really need to, I am by no means an expert with our fuel system, and my advice is all based on my own personal experience fixing it when I had the dreaded P0148 code that would come and go as it pleased.
I would highly suggest you get a RP gauge (I went with the Isspro EV2 from vulcan performance) they cost about $150 and come with everything needed for the install, and will help in any future diagnostic issues with your fuel system.
I am not affiliated with any of the companies I have suggested above either, I just found them to have good prices, and most importantly, outstanding customer service.
Hope you get it fixed without too much hassle, I'm in the same boat as you with truck issues....waiting on a new Accelelerator pedal position sensor for mine
i bought my rail pressure sensor from TC Diesel, he had some used ones that were good, you might want to give Todd a call there, as I got it for much cheaper than a new one.
As to whether you can still use you truck, your fuel pressure relief valve on your rail should protect your system, BUT, these can only operate so much before they give out, and then you will need to replace that too (TC Diesel for this). If I were in the same position as you, I would use it only if you really need to, I am by no means an expert with our fuel system, and my advice is all based on my own personal experience fixing it when I had the dreaded P0148 code that would come and go as it pleased.
I would highly suggest you get a RP gauge (I went with the Isspro EV2 from vulcan performance) they cost about $150 and come with everything needed for the install, and will help in any future diagnostic issues with your fuel system.
I am not affiliated with any of the companies I have suggested above either, I just found them to have good prices, and most importantly, outstanding customer service.
Hope you get it fixed without too much hassle, I'm in the same boat as you with truck issues....waiting on a new Accelelerator pedal position sensor for mine
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OK, thank you for all the info. I will look up and call TC Diesel and see what he has. I was looking around for a shop type rail press guage but was not having much luck. I previously had a 2001.5 HO 6speed, lost my leg and had to get an auto. I had done gauges, exhaust brake and all kinds of stuff to the 01, but that's behind me. It's now an 05 auto. Thanks again for the help.
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290 Posts
When you speak to Todd, tell him what is going on with you truck, he is one seriously helpful guy, and has probably forgotten more about our motors than most of us will ever know.
Good Luck
Paul
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Not trying to start anything but I guess he made a mistake, we all do that from time to time. No reason to be condescending about it, you could have just said, "hey, fyi, this should be here, not in the 03/04 section.
When your vehicle is not working properly, and you really need it, it's easy to miss the simple things like the correct place to create your thread.
Paul
p.s. Is'nt the fuel system considered part of the powertrain?.....
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132 Posts
The fuel control actuator (FCA) is located on the back of the cp3. It regulates how much fuel enters the cp3 from the lift pump thus regulating rail pressure. The relief valve is located on the fuel rail. Its job is to relieve or open if the rail pressure gets too high (around 25000 psi If I remember) and allows fuel to return to tank. This is a safety device and if cycled too many times can weaken and open at lower pressures.
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