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Discussion Starter #1
Thinking of getting a lift pump system for my stock 2012 Ram 2500 Cummins. Would you recommend Fass or Air Dog? I am stock, what size would you advise? Also I am thinking about a sump. I heard Beans has a really good one. A little pricey. The micro is not too bad, but is this good? Any advice would be great.
 

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Stock, stay stock. Why reduce your reliability by adding a less reliable lift pump?

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Discussion Starter #3
When I pull my 5er I get a check engine light telling me low fuel rail pressure. I put in gauges and the pressure is fine. Feels like starving for fuel though. There is a power loss.
 

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Assuming you have changed filters already.

I had a FASS on one truck. It worked fine. Can't say if it is any better than the AD as it was on the truck when I bought it.

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I changed fuel filter, and still. Brought back to dealer and they said they change sensor. Didn't happen for a while, but when I was driving down highway the light came on again. Low fuel pressure in fuel rail. So I put in fuel rail gauge, and pressure seems to be fine. That is why I think a better fuel pump(lift pump) would cure the engine light.
 

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Do you have the actual code. I agree with cwedel It sounds more like the Fuel Control Actuator sticking.

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So you added a piece of equipment for real-time monitoring (a rail pressure gauge) and it indicated the system was nominal, yet you still feel you need a new pump?

I (and others) are not following your thinking. Can you elaborate on why if you've proven you have good pressure to the rail that the pump isn't working and it instead isn't something electrical, aka something giving the computer a false sense of low rail pressure?

And Saintly, you are incorrect my friend. FCA in the sense of a high pressure common rail injection system is a Fuel Control Actuator.
 

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When I pull my 5er I get a check engine light telling me low fuel rail pressure. I put in gauges and the pressure is fine. Feels like starving for fuel though. There is a power loss.
You should post the code thrown but if it's the normal low real pressure code that gets at when the commanded pressure isn't meeting up with the actual pressure. And this has to happen for a pretty significant amount of time. Fuel filter, in tank lift pump (check how much it is flowing) and FCA are the possible culprits (unless tuned and the tuning commands something that the system can not deliver).

Under full power you should be seeing a solid 23-24K PSI and it should match the commanded pressure very close. Usually the truck won't set the code for just a 1-2k PSI difference but you'll feel the power loss.
 

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So you added a piece of equipment for real-time monitoring (a rail pressure gauge) and it indicated the system was nominal, yet you still feel you need a new pump?

I (and others) are not following your thinking. Can you elaborate on why if you've proven you have good pressure to the rail that the pump isn't working and it instead isn't something electrical, aka something giving the computer a false sense of low rail pressure?

And Saintly, you are incorrect my friend. FCA in the sense of a high pressure common rail injection system is a Fuel Control Actuator.
My concern is he hasn't defined good. If he thinks 21-22KSI is good and the truck is commanding 24K it'll be down on power and throw a code after a bit like that. Had a friend with a (what I pinpointed to a bad in tank lift pump) swearing his RP was good...it never got over 21KSI.
 

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Was your fuel rail pressure checked under load?
 

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Why dont we take a step back and start from square one. OP is your truck stock? What mods do you have if not? Stock lift pump can support plenty of power so unless you north of 6 or 700hp that's not likely your problem. Check the low pressure fuel with a gauge and see what it does. If it holds steady when rail doesnt meet commanded it's probably not the lift pump.
 

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Discussion Starter #16
The code my truck is giving: P0087, I just ordered a fuel pressure gauge. I want to monitor the pressure. I heard that the in tank fuel lift pumps the Ram puts in stock are junk. Carter lift pumps don't last. I don't want to keep dropping my tank to change the pump. That is why I'm thinking of an Airdog or Fass. Tell me your thoughts. My truck is completely stock.
 

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The code my truck is giving: P0087, I just ordered a fuel pressure gauge. I want to monitor the pressure. I heard that the in tank fuel lift pumps the Ram puts in stock are junk. Carter lift pumps don't last. I don't want to keep dropping my tank to change the pump. That is why I'm thinking of an Airdog or Fass. Tell me your thoughts.
Haven't really heard many folks say 4th gen Ram 6.7 lift pumps are "junk". Must be good ol' boys carrying on the "Dodge lift pumps are junk" from back in the 1st and 2nd gen days.

Until you get that fuel pressure gauge hooked up and report back the results, there is no sense in us all speculating :smile2: Let's get the data and then make a recommendation on what to do
 

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Before blaming the pump (since you are getting good numbers), I would check out the lines. Been reading this thread since I am interested in the FASS system purely from a degassing point of view...when a a thought came into mind. Granted, I dont know where the pressure transducer is for the fuel rail, but is there a chance that air collected around the sensor? This would account for pressure variations (i.e. air is compressible but fluid is not) but the air would not necessarily flow through the line (depending on the flow rate / sharpe of the lines). I have to assume the engineers at Cummins have vetted this in their DFMEA but I know people make modifications thinking it is all for the better...

Option B could be a small fuel line leak that lets air penetrate the system with minimal leaking (i.e. Venturi effect).

I know that 20KSI is a decent amount of pressure, but at work I have seen some interesting results from air in the lines going up to 30ksi in the microfluidics realm...
 
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