There is no longer a vacuum hose on the regulator. Older systems used that to relax the regulator and lower fuel pressure when manifold vacuum went up. That keeps the difference between the two forces constant to prevent a rich coast-down condition.
You're right though, that isn't the regulator. That is part of the fuel pump assembly now. If it was the regulator there would be a metal return tube under it.
That doesn't look like any test port I've ever seen. It should look like a tire valve on the 3.3L engine. The service manual shows three different pressure testing adapter harnesses and two different engines. One looks like what I use with my 3.0L engines. One looks like a hose with the typical 3.3L test port, and the last one, I assume, is for the 4 cylinder engine. Nothing in the manual identifies the item in your photo as a test port.
That last adapter looks like it would connect to a quick coupler-type hose and it looks like that could be what is in your photo. I wonder if that is a cap on the test port. The metal hooks under the cap would be spread apart with a quick-disconnect tool to release the cap. That tool is not shown in the manual. If that really is a test port, I wonder why they show test adapters in the manual.
Since there's no fuel return hose, how is the air bled out to get fuel to the injectors. Could this be a bleeder valve? You would think they would mention it in the manual. What happens if you press down on it?
Monday, February 14th, 2011 AT 5:13 AM