QUOTE(s13u74cr4 @ Jun 16 2024, 07:22 PM)
The larger SS line goes into that “Y”. For sure that plastic piece needs to be replaced.
I have not traced to the tank yet so no idea if that is correct. Any easy way to tell without taking too much apart?
The small line does go to the fuel filter then the top port on the fuel pump which is correct.
Like I was saying - that part is wrong!
Your Y has a large SS line attached - that is INCORRECT. All connections of the Y should be small diameter line. The Y is for returning fuel to the tank from both the fuel pump
and the engine (via the small diameter SS line).
BTW, the small SS line (return) exits the tunnel at the front and attaches to the pipe fitting that is
closest to the center seam of the fuel tank. You're able to see that thru the round port if you jack up the front and crawl under it with a strong light. The fitting furthest from the fuel tank's seam is the larger supply pipe and contains a mesh filtering sleeve inside the tank. [except for '75-'76 cars .. I think the nipples off the fuel tank are both 8mm in their case]
If you find the above to be the case, then good - all's well at the front end. If you find the opposite to be the case, it could be that a PO left the mesh filtering sleeve off and crossed up the fittings (if that's even possible), but the mesh filter sleeve will only fit into the larger fitting hole furthest from the seam.
Fuel Filter: Sorry but I believe your fuel filter set up is also wrong. Looks like you have a Mahle KL11 which is 8mm on both sides iirc. It will work but should come from the larger SS pipe and connect via a reducing hose. What the stock had was a square filter that had 8mm inlet/outlet but utilzed a "reducing hose" (pn#914 356 525 00).. which would only work if the larger SS pipe is the feed line, as it should be. Large SS line exits the rear firewall, reduces with that short hose into the filter, and then on to the 'S' port of the pump (suction).
The D port of the pump is 'direct' pressure to the engine, R port is the 'return'.
HTH.