i lost power steering around a corner,, a bit hairy.

G'da Boo Boo

The pump is gear driven so drive to it shouldn't be a problem.
The reservoir has two hoses to it, both near the bottom, one above the other.

The upper19mm dia hose is the supply to pump (feed line) and is rubber hose nearly all the way, the last bit which runs near the LHS of the crank pulley is steel.
That hose should have absolutely no kinks in it as the full dia will be required for pump flow when actually turning the steering and flow rate has to be sufficient so the flow is not impeded.

It may be necessary to carefully check that hose by removal.
If it is squashed, twisted slightly or kinked or even internally restricted by delamination of the inner lining, the vane pump will not be able to supply pressure as pump action will stop if that vital flow isn't possible.

The bottom line into the reservoir is "return oil" from the rack. That should not be a problem.
There is a possibility the rack's steering shaft valve may refuse to open and allow the flow of pressure oil to the rack. That could be because of some particle contamination in the valve system.

Best to have the lower hose, ie, smaller one on reservoir, removed from reservoir (plug the lower hole) and all fluid fed into the reservoir caught (into a bucket) as it leaves the system as the steering is operated from side to side, ie lock to lock, with the engine running.
That will cause flow pressure as the wheels are made to turn side to side.

That should completely flush the system and clean all fluid from inside the rack, pump,lines and reservoir.

I hope the dealer can perform that for you. It is not hard to do.

So either rack steering directional valve or hose restriction is a probability. Can't see how the pump is going to be go and stop.

Mine is same month same year.

Cheers
Ross M

boo boo

hi
I have struck the problem on 2 occasions in the past 1 with GMC3500
an 1 time with a Mercedes Benz ambulance . with the GMC when hot you could turn the wheel suddenly an actually beat the power assistance , the benz was a pump down on pressure
cheers mechpete

I don't like the sound of your problem. A different issue, but still P steering related...

A few years ago, I was doing a driver training course with the Aust Federal Police. During a classroom session, I asked "Which is better - Power Steering on not?". I was expecting the answer Power steering because it is normally less turns lock to lock. The instructor said "No! When you need the power assistance most, it goes out to lunch." A few hours later, we were out on the course in a standard VP Commodore, and pushing it a lot harder than I would ever consider on the road. The tail broke away and in chasing it to opposite lock, the Power steering did indeed go out to lunch - right when I needed it.

Similar thing with the brakes. I had assumed that with 4 wheel discs, the braking would be unbeatable. Wrong! and I am not talking about simply locking up the wheels. Two successive applications of the brakes under really severe braking and the pedal was on the floor as the brake fluid boiled in the calipers. Again, this was driving way beyong what I would do under normal road conditions, but say towing a heavy load down a long hill without changing down a few gears, I could easily see the situation where the brake fluid boiled. Even more so when you consider that most people do not change their brake fluid very often and it absorbs mositure, dramatically lowering the boiling point.

Boo Boo - maybe your Power Steering fluid is stuffed. Is it dirty (burnt)? If so, maybe the pressure relief valve on the pump needs checking.

Boo Boo
If it is a sticking vane I would a small amount of Nulon Auto trans additive.
It is Teflon of course and will make the pump and all steering related internals last longer.

I wonder who the person at the dealers is, who can ID a intermittent sticking vane.
An examination with a strong magnifying glass "may" reveal a problem.

Boo Boo,
Good to see Isuzu are going to help out, I know it would be a little disconcerting to have the power steering go at speed and by what one person said, it is lucky you weren't driving a Ford or Holden as then the brakes would probably failed as well. LOL.

It is always good to see a manufacturer backing their product, even when it is slightly out of warranty.

Hope all is fixed quickly and at minimum cost.