AMS explores the Gen Coupe fuel system (2.0T)
by Ivan Phipps

I got the Coupe in the shop today and dissected the fuel system.
Access to the fuel pump is quite easy. Removing the bottom portion of the back seat will reveal the two cover plates for accessing the fuel tank. Under the drivers side is where you find the fuel pump.

After disconnecting the electrical connector and two quick connect fuel lines, you remove eight bolts for the hold down ring and the fuel sending unit lifts right out.

This is where the magic happens. Inside this fuel sending unit
is the fuel pump, fuel pressure regulator and and also doubles as a surge tank. The outside houses one of the two fuel level senders. One other feature of the fuel sending unit is the siphon. Let me explain this really quick....

The fuel tank has a hump in the center for drive shaft clearance which basically splits the tank into two sections. This is what is known as a "saddle tank". Because of the "saddle" design of the tank, a fuel transfer tube is needed to keep fuel on the side of the tank that the fuel pump is on. The passenger side has a pick up tube and the drivers side has a siphon. There is a transfer tube that runs along the top of the tank between the two sides. Inside the fuel sending unit, there is a siphon which is connected to the outlet of the fuel pressure regulator. The fuel returning back into the sending unit runs through the siphon T which creates a siphon pulling fuel from the passenger side to the drivers side. If this system was not there, you would run out of gas at a little under half a tank because all your fuel would be on the passenger side with no way to get to the fuel pump.

I was able to disassemble the fuel sending unit and pull the fuel pump out and get it into our test rig. Got some GREAT news there. Here is a chart that shows flow versus pressure of the Coupe's fuel pump versus other pumps we have flowed.