So after having run into this error code before a couple of years ago, things have been pretty OK for until recently. On one of my 06 CRDs, it is throwing a P0093 all the time now. I have even taken to driving around with my code reader so I can clear it when I am out and about. No other codes other than the P0093, basically listed as "massive fuel leak", which I don't think it is. So I wanted to ask here what to check next.

A couple years back when this was cropping up, several suggested that I install an in tank fuel pump. It probably would fix the air in fuel filter issue, which was pretty bad back then, but isn't now. Not saying the hand pump on the filter is solid when this happens, but it only takes maybe 5-8 pumps to get it there (was many more several years ago). If it all is due to leaking air, I'll put in the tank pump, but before I do I wanted to run thru what other test I can/should do to be sure that's the problem. Here are the symptoms:

The engine starts and runs very nicely, good power (when not in limp mode after a code is thrown), no fuel leaks I can detect. The P0093 happens typically when I am hitting the go pedal for more fuel. Most of the time starting from a stop or just after, but sometimes when I try to pass on a hill or the like. If I was really hitting the go pedal the engine might die, but usually it doesn't, and I just drive home like a granny. Lately with this one CRD, the code can come back after clearing it, after just a few 100' of driving. Always restarts, but will be in limp mode until cleared. No other symptoms I've noticed.

So here is the data my code reader pulled from the most recent incident:

P0093
Calc Load 59.2%
ECT 185F
MAP 32 inHg
RPM 1600
Speed 8mph
IAT 163F
MAF 5.07 lbs/min
Fuel Press 10768

Anyone see anything here that looks suspicious? Is that fuel pressure good?

TIA

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2006 KJ CRD

More than likely your CP3 is starving for fuel on the suction side due to a vacuum leak somewhere on the suction side of the fuel system.
When this happens, the CP3 injection pump cannot provide the proper high pressure rail pressure and thus starve the fuel injectors of proper fuel injection when under higher loads.
Best solution, install the intank low pressure fuel pump which will adequately keep the CP3 supplied at all times with plenty of fuel and prevent any air ingestion into the low pressure side of the fuel system.

An abundance of air sucked into the fuel system over time can destroy your CP3 injection pump or the fuel injections. They DO NOT like air in the fuel, that is why the programing in the ECM is putting you into limp mode, trying to get your attention!

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Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount
98 Dodge Cummins 24 Valve

I hear you WW. Just trying to make sure that is the problem.

Dud you look at the recorded fuel pressure, is it in range or low?

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2006 KJ CRD