Thanks.
Since his car is an 80, my
guess is the WUR line goes back to the FD and the T connection is solely for the accumulator. His posts now make more sense to me as I was only familiar with the early set up. Still, the major task now is to be certain the line from the WUR is open, regardless to where it connects.
Ben, sorry for the sidetrack, but I don't want to make your task more difficult by giving you incorrect information. Hope you didn't get confused due to my efforts.
I'm going back to your post #22. From that post, test #3 is the test for the flow through the WUR return line as I now understand it. That test showed fuel flowing out the line when the FP was running and the line disconnected from the FD.
That leaves only the internal bores of the FD where the WUR return line feeds into the FD return line, or the WUR itself, as suspects. Could be the pressure relief valve as well, though I am not familiar with how that works with two separate connections at the FD.
From your picture of your FD, here's what I see:
The line/fitting in the foreground is the FD return line. The partially hidden connection behind it--with the banjo fitting and long hex nut--is the WUR return line. Does that sound correct? If so, then the WUR return feeds into the FD body and flows out through the FD return line which is next to it. Your test #3 demonstrated fuel from the WUR flowing to the FD port,
which means the line is not blocked.
I'm going to suggest another test, but please ask Tony if this is safe as I've never done it.
Hook up your fuel gauge set to the WUR. Disconnect the WUR return line from the FD as you had done in your previous test #3. Place the disconnected end of the return line into a suitable container. Turn the valve on the pressure gauge so the WUR is isolated from the FD (system pressure measurement.) Start the FP as you previously did and read the fuel pressure from the gauge. Now, open the gauge valve (fuel should begin flowing out the WUR return line.)
Does the pressure reading now drop? If so, the WUR is doing its job and the blockage must be inside the FD or with the pressure relief valve. If the pressure doesn't change with fuel freely flowing through the WUR return line, the problem is with the WUR itself, and that can be addressed.