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watsonrx13 |
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#1
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 2,735 Joined: 18-February 03 From: Plant City, FL Member No.: 312 Region Association: South East States ![]() |
I've put my engine back in the car and want to confirm the FI fuel routing. I've looked at PP/Dave Darling's diagrams, but would like confirmation:
![]() 1. large (9mm) plastic fuel line from firewall connected to fuel filter 2. fuel filter connected to fuel pump at (S-suction) connection 3. (D-damper) connection on fuel pump connected to fuel rail on passenger side, rear connection 4. (R-return) connecton on fuel pump to Y connection 5. Y connection to small (7mm) plastic fuel line from firewall 6. Y connection to fuel pressure regulator 7. fuel rail on passenger side, front connection, to fuel rail on driver side, front connection 8. fuel rail on driver side, rear connection, to fuel pressure regulator 9. fuel rail on driver side, middle connection, to cold start valve. Also, I'd like confirmation on the electrical connection to the fuel pump: 1. black/red wire to the + side of fuel pump 2. brown wire to the - side of the fuel pump If I wanted to test the fuel pump outside of the car, I should be able to connect a positive wire to the + of the fuel pump, then to the + side of a battery, then - fuel pump to - battery. I could then connect the (S) fuel line and place in a container of gasoline. Then place the (D) and (-R-) fuel lines into an empty container. When I connect up the electrical lines, I should get the pump to hum and run fuel through the pump. Also, if I turn on the ignition, I should be able to get voltage across the black/red wire and the brown wire, correct? Finally, has anyone successfully found a shop that can rebuild these fuel pumps? -- Rob |
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swl |
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#2
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Senior Member ![]() ![]() ![]() Group: Members Posts: 1,409 Joined: 7-August 05 From: Kingston,On,Canada Member No.: 4,550 Region Association: Canada ![]() |
from what I've been able to figure out the third port serves two purposes. It prevents an over pressure situation and it assists in priming the pump. I don't claim any expertise but I don't think either are necessary. Obviously the porsche guys had the same opinion. The pop off valve opens whenever there is air in the system sending the air directly back on the return line. In the 2 port system that air would get sent around the FI loop before it gets out of the system. This means it would get compressed and maybe hammer the components a bit. Just keep this in mind when you first start it from a no gas situation - maybe run it a bit before attempting to start it.
Plumbing is identical just eliminate the 'y' where it went back to the 'r' port. |
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