Just got off the phone with an independent Land Rover Mechanic. He didn't have any openings until the 10th but suggested checking the roll over sensor. Thing being is I can't find any info on it but while searching I came across the inertia fuel shutoff switch. Can that be a candidate for my trouble?

 

There really isn't a rollover sensor, or an inertia switch on these. It is built into the SRS ECU, and if that were the cause, the door locks would begin to cycle lock/unlock and the hazards would be going off at failure, as it would enter Crash mode.

I would be looking at fuel supply with it being a slow shut down, and caused by a bump, not sure if it was the thread or not, but I posted a picture of a somewhat common issue inside the fuel tank that causes a stall. I'll upload it later if it wasn't this thread.

 

Looked at those pics and mulled the idea around but I was under the impression that a dislodged/disconnected siphon tube would only cause me trouble if I got under a 1/4 tank or so. I'm leaning toward the Crankshaft Position Sensor. Reasons being; it's on the front of the engine near the tires so if there is a loose connection or it's a bad unit it would be affected from a front end jolt and from what I've read so far a malfunction may not present with a code. I figure I can hook up a multimeter to it to check resistance but I don't think I'm going to be able to check it for voltage due to the design of the connection. I think the voltage should be 200mv (millivolts?) I can't find the specs in the shop manual or AllData.

 

A CKP issue would give you an immediate stall, as you would lose spark.

Also, it is located at the rear of the engine, behind, but through(have to see it to understand) the oil pan.

The way it is failing, it points toward fuel supply, I agree that it shouldn't cause issue with a good amount of fuel, but strange things happen sometimes. I would be looking in the tank for anything that doesn't look quite right, possible fuel pressure regulator failing?

 

Could the fuel pressure regulator malfunction intermittently? When I tested it I had really close to 65psi.

 

Absolutely. It's a simple mechanical device, could be sticking, or failing when it gets jared. You could check fuel pressure while driving, and see if it drops out during a failure, seems to not be too terribly difficult to reproduce.

 

I was looking at the fuel tank assembly diagram and it appears as if the pressure regulator is not a replaceable part. As it is described I'm under the impression that it is integrated into the fuel tank. Does this mean I need to replace the entire tank if the regulator is bad?

 

Below is a link to the 10 page pdf that shows and describes the fuel tank internals. The second link refers to the fuel purge valve.

The third link is to where the files are located plus a number of other unrelated LR files.

Ignoring the difficulty of dropping a fuel tank, while there is alot to wrong inside, it does not seem to me that much of it is removable or replaceable.


http://www.disco3.co.uk/gallery/albu..._Operation.pdf

http://www.disco3.co.uk/gallery/albu..._Operation.pdf

DISCO3.CO.UK Photo Gallery - LR3 miscellaneous

 

Before I was going to spend the time and effort rigging the fuel pressure tester for a road trip I went over the basics. Checked the MAF, throttle body, fuel rail and injectors for leaks, air filter, and then the PCV valve which I initaly over looked. I pulled off the hose and black sludge poured out. I gave it a spray and even more sludge poured out. Going to the dealer now to get a new one. Could a severely slugged up PCV cause my issues? Either way it needs to be replaced so it's a win win if it works.

 

Regulator is part of the pump assembly.

In order for the PCV valve to cause this it would either need to be over pressurizing the crankcase to the point the pistons had trouble moving, or filling the intake with enough oil to flood the cylinders, so you would either be pouring smoke out the tailpipes, or have oil coming out of every orifice of the crankcase. Replace it, but I don't think that is your main issue.