better fuel supply - Dodge Cummins Diesel Forum
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post #1 of 19 (permalink) Old 06-19-2019, 09:39 PM Thread Starter
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Cool better fuel supply

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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post #2 of 19 (permalink) Old 06-19-2019, 09:48 PM
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Stock, stay stock. Why reduce your reliability by adding a less reliable lift pump?

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post #3 of 19 (permalink) Old 06-19-2019, 09:54 PM Thread Starter
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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.
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post #4 of 19 (permalink) Old 06-19-2019, 09:57 PM
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Check the FCA. That would be your target.

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post #5 of 19 (permalink) Old 06-19-2019, 10:03 PM
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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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post #6 of 19 (permalink) Old 06-19-2019, 11:03 PM Thread Starter
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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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post #7 of 19 (permalink) Old 06-19-2019, 11:08 PM Thread Starter
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What is FCA?
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post #8 of 19 (permalink) Old 06-20-2019, 12:13 AM
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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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post #9 of 19 (permalink) Old 06-20-2019, 06:48 AM
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Originally Posted by Two4thevalley View Post
What is FCA?
https://www.fcagroup.com/en-US/Pages/home.aspx

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post #10 of 19 (permalink) Old 06-20-2019, 08:08 AM
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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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post #11 of 19 (permalink) Old 06-20-2019, 10:21 AM
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Quote:
Originally Posted by Two4thevalley View Post
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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post #12 of 19 (permalink) Old 06-20-2019, 10:26 AM
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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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