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This is Gasser oil NOT Diesel oil. denoted by API SN --- S is for gasser and there is no CK (K being the most current for diesel with C as the first letter). What you want is the oil with CK or older CJ sometimes they add the number "4" after that. Diesel oil have the capability to deal with...

Just something to keep in mind that OP's application is just an engine in a Nissan Patrol. It is not the same platform/foundation that we are talking about here, GM's truck and suburban. Plus he is in Australia not in the US which is another factor. For that matter, there may be better...

Load test the batteries?

Forum like this is not because we love the engine. Some of us already bought a truck with this engine and we need/want to keep it running without buying another truck. Mine is used for going to the grocery if my Toyota is out with other family members. LOL!!! So at this point, in its life, it is...

Get a better LP. 8-14 psi is the spec of the LP at the LP but it usually don't get that high after FFM before IP. There is loss of pressure at every point of the flow. That is the nature of fluid flow.

3-4 psi steady after the FFM. In a lot of cases, the pressure dip down to 0 that is why steady is also important.

All those Sensors and Senders need to be ACDelco brand, not store brand. Otherwise, you will have more issues.

Did the line from IP to injector sequence correctly during install?

If it is a suburban, there are some quick connect under the passenger side near the frame. I am not sure if it goes that far but if that one leaks, it will puddle everywhere and it is the lowest point of the cooling system. Mine leaks there at one time.

The hoses to the IP and t-valve is under the intake. They will fail with age. I thought you already replaced those, otherwise, I will suggest you replace it.

The fuel gauge in this truck is suck. Mine did it too and I know the ground is there. Saw it when I replaced the wheel cylinder. The only way to see if it has a tuned ECM is by taking it out from behind the glove box and do a visual inspection. Usually the tuned ECM have a sticker on who...

You may want to see when engine is running? It may just be as simple as the clamp too tight or not tight enough? Both can cause leaks. At one time, mine was ok when not running. When running, I see the leaks. Now, very intermittent and I am not worry about it anymore since it is old truck. LOL!!!

Did you ever LOAD test the batteries one at a time? NOT voltage test.

There are more than 1 issue, when I read it. The GPs are controlled by ECT (Engine Coolant Temp Sensor)? It looks like there is ECT code. Try fixing that code first. Next, the Oil Pressure Sensor controls the LP unless it is modified. So, if OPS is bad, then LP will not run when engine...

EP158 is still the best. DONOT use EP1000. If you go stock LP.

Did you put the diesel tank sock?

Assuming that is real, I will buy the IP listed on kijiji.

Find a local rebuilder, they probably can rebuild it better. Otherwise, if they have them in stock, they probably have better quality than the part store. If you go to Part Store, you need to get a "NEW" not rebuild.

Another thing, did the starter rear bracket installed when replacing starter? That bracket is hooked up using the stud in the starter then a nut to mount it to the bracket. If it is not there, it will break a chunk of the engine. Was the starter bolt replaced with proper GM starter bolt of ARP...

How did you test all those parts? New part do not mean they are good? Is that ACDelco ignition switch?