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It's strange that DTC 707 only started setting after you had the fuel tank out. This points towards something you may have disturbed while the tank was out. Possibly you might have two problems now??
You might want to look at installing an electric lift pump down near the fuel tank.
Pressurising the fuel lines should make it easier to see any leaks and the added pressure to the injector pump may also help it.
Yendor - Agree that a lift pump may help fault find. Any recommendation on a lift pump brand / model?
As for the 77 (P7) code we had it previously before the ecu relay change also but then nothing for a few months until going up and down the carpark ramps (we had the code as the it was running rough), then nothing for a few weeks until the fuel tank removal!! There is no logic to when the code appears.
Have you tried adding some 2stroke oil to your fuel, there is a thread of the benefits somewhere.
stumpie - A fuel lubricant could help and I found the threads and the general consensus seems to be it's only really beneficial for the 4.2. The 2 stroke might also stuff the catalytic converter.
Hi guys im only a newbie but any chance the interemittent nature could be from the formation of a vapour lock in the fule line
HV2002 - I can only hope that's what it was and it's now gone!
Truck has run fine for the last week with no problems - we'll see how long we go this time until something happens!!
hi guys . I might be clutching at straws here but !!! I believe there might be a small , fine , strainer where the fuel line goes into the injector pump . maybe this is at the point of blocking up . at this point I think it would be worth checking to see if it needs a clean . just my 2 cents worth . ray.
Nipagu7 - I was told that aswell so had a look but no - been told only on 4.2d . Pardon my delayed input ( similar problems so trawling the threads )
I see you have ECUTalk display, what is the ICV% read out normally and when it starts going pear shaped?
If IP IVC% are bellow 50% most of the time you have either air in the fuel or fuel starvation somewhere. Anything bellow 30% on warmed up engine means big trouble!
I do urge you to install additional lift pump anyway even if you have to ultimately replace the IP. This error is common and main culprit is the pump's internal ECU/controller. What happens is due to heat (it uses fuel to cool and lubricate as well so any fuel starvation will ruin the pump) the circuit board can break the contact or snap the links. Google Youtube videos about failed VP44 pump ECUs. Last firmware update for ECUTalk can show fuel temperature as well, going consistently over 65°C is not good perhaps consider fuel cooler on return and never run the tank bellow 1/3. The large volume of fuel recirculated around to keep temperature down means that less fuel available the hotter it will get.
Because it is so intermittent I suspect it is electronics fail not mechanical/hydraulic.
Good luck
Cheers
MATE !! I've been havin the EXACT