better fuel supply - Page 2 - Dodge Cummins Diesel Forum
4th Gen Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine, Transmission, etc...NO ADVERTISING

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post #13 of 20 (permalink) Old 06-20-2019, 12:16 PM
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Was your fuel rail pressure checked under load?


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--2006 2500 4x4 4 door long bed auto, 8" BDS, 37s
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post #14 of 20 (permalink) Old 06-25-2019, 09:11 PM
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post #15 of 20 (permalink) Old 06-25-2019, 09:19 PM
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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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post #16 of 20 (permalink) Old 06-26-2019, 08:53 AM Thread Starter
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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. My truck is completely stock.
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post #17 of 20 (permalink) Old 06-26-2019, 08:54 AM
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Dont know where you heard the stock pumps are junk from but they are not. How about what mods you have done to your truck?
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post #18 of 20 (permalink) Old 06-26-2019, 08:57 AM
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Quote:
Originally Posted by Two4thevalley View Post
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 Let's get the data and then make a recommendation on what to do

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post #19 of 20 (permalink) Old 06-26-2019, 03:01 PM
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The lift pumps installed in the 91.5 trucks were the best in the 89-98 era of the 12v.

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Originally Posted by Mike Wood View Post
Must be good ol' boys carrying on the "Dodge lift pumps are junk" from back in the 1st and 2nd gen days.

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post #20 of 20 (permalink) Old 09-04-2019, 12:14 AM
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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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