You can see a diagram of the pump on this unit by clicking on the below link:
www.mastertoolrepair.com/s71-at32-7580b-...000-pump-p-3750.html

Which Safety Valve is blowing off? Is it the SV on the Intercooler Tube (which connects the two cylinders) or the SV on the finned Aftercooler (which the Copper Discharge Tube connects to)?

- MTR

Well, this can happen for a couple of reasons.

1. The Safety Valve is defective; usually it's because the spring inside has lost tension and won't sense the accurate pressure (PSI).

2. You have a blown Head Gasket (likely).

3. You have a damaged/defective Valve(s) in the Pump.

If it continuously leaks as soon as you start up the unit, it probably means a gasket is blown out. I would take the head off and inspect the Gaskets and Disc Valves.



- MTR

Then I would say the Safety Valve is functioning correctly, and to take the pump head off and check the Gaskets & Valves; it's probably as simple as blown gasket. A lot of times the rib in between the large and small circles will tear.

- MTR