6.7's need lift pump pressure gauges?

[beezer]

Anyone know if my ’09 6. 7L has a lift pump fuel pressure sensor (after the fuel/water separator, not pre-filter) that can give a readout with an OBD tool? This would be handy, for monitoring the condition of the fuel filter, and for preventing damage to the high pressure injection pump. Or does the computer automatically shut the engine down or go to limp mode if it can’t attain fuel injection pressure? I have an Edge Insight gauge and its menu lists a Dodge specific Parameter called “fuel pressure regulator”, and a generic parameter called “fuel pressure”, but both of these yield “N/A” .



Do these 6. 7’s need a lift pump fuel pressure gauge? Thanks. Bruce.

 

[morbius]

No odbii monitoring points on the lift pump. The only PIDs available is after the CP3 pump. Need a gauge ... .

 

[beezer]

Thanks. What did you install for your four fuel filters? I'm planning on installing this TRC-10 Fleetguard kit w/2micron filtration and separate water filter:

Diesel fuel filtration systems



Did you see significant drop in fuel pressure, post filtration, and have to upgrade your fuel pump? Thanks again. Bruce.

 

[morbius]

I used a combination of two kits.

1. GDP big line setup that places a filter off the intake manifold on the 6. 7
2. XX kit that place two filters under the 6. 7 truck up high and next to the transfer case

I do not like filter that hang down, my truck does go off road on farms and ranches.

The filters I used in order from tank to CP3 pump are:

Fleetguard FS1212 (25 micron absolute) [may do something different later in the 15 to 20 range ... ]
Donaldson P550847 (10 micron @ 99%)
Fleetguard FS43258 FS-2 (5 micron @ 98. 7%) (6. 7 stock version 2 filter setup)
Cat 1R-0750 (2 micron absolute)​

I am a firm believer in staged filtering. Filters do fail, so staging it does protect against most. What I have is 2 water filters, 1 combination water/particulate, and 1 particulate.

I still have 11 psi at the CP3 pump using stock pump, pump out is 15 on mine.

Here are a link to what I did:

Filtering project -​

Hope that helps. I have several thousand miles on this setup. I am data logging speed vs rpm vs fuel rail pressure vs load and to date, no starvation, reduced pressure, and CP3 pump happy. Next I will a pre-filter and post filter pressure gauge to I can more accurate info

Cheers.

 

[beezer]

Thanks for sharing, interesting, am thinking my first step will be to get the truck's current pre and post filter (stock 7micron) pressures measured with gauges, then measure again with the new Mopar 5 micron, and then proceed with the Fleetguard kit, so there will be a baseline to compare to and determine if more lift pump pressure capability is needed. I'll have to check again but IIRC the TRC-10 kit will not drop the filters below the bottom of the frame rails, good input. Thanks. Bruce.

 

[morbius]

Good move. Very important to measure what you have now. That is why I made up a little test jig with mechanical gauges to catch certain readings are various times. Then I proceeded forward over time. My last addition was the XX bracket with my choice of filter and that is when I got a total of 4 psi drop.

 

[firemansdiesel]

Has anyone with extra filter(s)/filtering note their before and after pressure readings? I'm curious what the 6. 7's fuel pressure stock filtering is, then how much drop w/ a 2 micron filter (i. e. GDP Big Line w/ CAT 1749 filter). I was told the 6. 7's fuel pressure are lower than the 5. 9's (same pump w/ bigger engine) at stock filtering.