Since you have the gauge, you might as well measure the following:
- Cold control pressure.
- Warm control pressure without vacuum.
- Warm control pressure with vacuum.
This is how to do this simple test. Install the CIS gauge between FD and WUR (valve closer toward WUR). Disconnect the plug to WUR and test run the FP. With the valve open, you are measuring CCP (cold control pressure). Record the pressure reading. Next step is to plug the connector back to WUR. As soon as you connect the plug back to the WUR with the FP running, the WUR will begin to heat up and the control pressure will gradually increase until it stabilized. This is now your WCP (warm control pressure). It is also helpful to record the transition time from CCP to WCP. A 1-min. interval up to the time WCP maxed out (4~5 mins.).
If you are just running the FP (engine off), you will get the WCP without vacuum. To measure WCP with vacuum, use a vacuum pump and apply 5” Hg. Keep us posted.
Tony