RA7 stalling on idle

Thinkin
I think you will find the suction control valve and the fuel pressure regulator are quite different items.

The SCV is in the head of the pump and the pressure regulator is on the rear of the pump.
Both do have a bearing on engine running or stopping though.

Not sure what pressure was tested for RUK 42 as the rail pressure will be in the order of 20,000 psi or more and requiring specialized gear.

The supply fuel pressure, if not enough, or varying, will alter the delivery to the SCV and the pump and then the rail pressure cannot be achieved.

Both the SCV and the fuel pressure regulators on RA's do give some trouble and may require replacement.

A pressure gauge on the drain end of the fuel filter will show regulated pressure which should be around 6psi.
If it is faulty the SCV has no chance to work correctly. If the low supply fuel pressure is at fault it can be replaced but until that is determined an SCV replacement may not fix it.
Cheers

Ross M
Your right, SCV and fuel pressure regulator can't be the same. Checked my invoice and it indicates suction valve was replaced, done 15,000km since and no further problems.
Cheers

Kevin
Because the engines are the same as the Dmax the new version of the regulator purchased from an Isuzu dealer may be cheaper but the same part.
It may pay to check that.
When i priced the 3 filters for 2011 Dmax I went staight to Oldhen and priced exactly the same items there.

Isuzu was (at that time) $185 approx and Oldhen was $270 for the three.
Anyone buying at Holden paid the $70 increase. NICE.

Damn. Didn't think of that one. Must remember for future reference. Thanks

This may be the issue

The Above link may also help

Regards Tony