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> FI fuel and wiring routing
watsonrx13
post Jul 21 2008, 06:20 AM
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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:

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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
post Jul 22 2008, 10:09 PM
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Tab914 was the guy who discovered the brushes problem. I'm on the road and the hotel gateway is really fracking with my browser - can't give you a direct link but the thread is called 'fuel pump issues, no power to pump'

I've been searching for the thread with the relay board diagram but am getting frustrated by this browser thing. So I'll try from memory (dangerous!)

1 lift the power to your coil during testing to guard against welding your points.
2. key on
3. with volt meter measure from ground to each side of the fuse. Should be 12-13V on both sides.
4. if power to the fuse is good then uplug the 4 pin connector on the back left of the relay board. Use a jumper to ground pin 3 on the relay board to ground. This should turn on the pump but most likely won't
5 if the jumper failed to start the pump then we are probably looking at one of the two relays - main power or fuel pump. replace both with known good relays (headlight motors are a good source).

If none of that points to the problem then I need my diagram to take your farther.

Background.
The main power relay turns on with switched power from the key.
It then provides power to the solenoid of the fuel pump relay. The ecu then turns on a 'switch' to ground to activate that solenoid. When the solenoid makes it switches power that comes from the battery through the fuse, through the relay contacts and onward to the pump. Jumping pin 3 is basicly doing the job that the ECU does.
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Posts in this topic
watsonrx13   FI fuel and wiring routing   Jul 21 2008, 06:20 AM
swl   Daves drawing is right on from all accounts. Assu...   Jul 21 2008, 08:06 PM
watsonrx13   Steve, thanks for the reply. I forgot to add that ...   Jul 22 2008, 06:28 AM
SirAndy   So I connected everything back in the car and tur...   Jul 22 2008, 12:20 PM
watsonrx13   So I connected everything back in the car and tu...   Jul 22 2008, 07:20 PM
SirAndy   Next, suggestion.... :) so, did you switch relay...   Jul 22 2008, 11:03 PM
swl   I'm not a fan of hot wiring Rob. The relay bo...   Jul 22 2008, 06:40 AM
watsonrx13   Steve, thanks... I do have a multimeter, but I...   Jul 22 2008, 06:56 AM
Cap'n Krusty   The hose from the plastic supply line to the filte...   Jul 22 2008, 07:38 PM
swl   Tab914 was the guy who discovered the brushes prob...   Jul 22 2008, 10:09 PM
roadster fan   Here is the thread that swl is talking about Fuel ...   Jul 23 2008, 02:05 AM
watsonrx13   Jim, thanks for the link, evidently I missed it or...   Jul 23 2008, 06:03 AM
watsonrx13   Well, I read the postings and noticed that TAB914 ...   Jul 23 2008, 04:02 PM
swl   try pm'ing/emailing dominic - I don't thin...   Jul 23 2008, 06:17 PM
watsonrx13   Not yet, unfortunately life has gotten in the way ...   Jul 23 2008, 06:26 PM
swl   Not yet, unfortunately life has gotten in the way...   Jul 23 2008, 06:49 PM
watsonrx13   Not yet, unfortunately life has gotten in the wa...   Jul 23 2008, 07:41 PM
watsonrx13   Well, this weekend I tried to disassemble one of t...   Jul 28 2008, 06:10 AM
swl   6 Volts huh - I guess you're halfway there :D ...   Jul 28 2008, 07:37 AM
watsonrx13   6 Volts huh - I guess you're halfway there :D...   Jul 28 2008, 06:29 PM
swl   short answer is most likely contact resistance. I...   Jul 28 2008, 07:20 PM
watsonrx13   short answer is most likely contact resistance. ...   Jul 29 2008, 07:55 PM
watsonrx13   Thanks Steve, I'll check this tomorrow. Checki...   Jul 28 2008, 07:36 PM
swl   Thanks Steve, I'll check this tomorrow. Check...   Jul 28 2008, 07:59 PM
swl   One last thought. When you have the 14 pin connec...   Jul 28 2008, 07:43 PM
watsonrx13   One last thought. When you have the 14 pin conne...   Jul 28 2008, 07:45 PM
swl   That sliced casing is looking pretty suspicious. ...   Jul 30 2008, 07:42 AM
watsonrx13   Yes, that is correct... I agree about running an...   Jul 30 2008, 11:20 AM
swl   The only other things that use the power from pin ...   Jul 30 2008, 12:38 PM
smg914   I can personally recommend a contact cleaner calle...   Jul 30 2008, 02:51 PM
swl   hey that sounds interesting! I didn't hav...   Jul 30 2008, 03:33 PM
smg914   Actually it is DEOXIT and I purchased it at Radio ...   Jul 30 2008, 11:27 PM
watsonrx13   Thanks Steve, I'll pick some up this weekend a...   Jul 31 2008, 05:46 AM
watsonrx13   OK, I just received another FI fuel pump, but it...   Jul 31 2008, 05:53 AM
swl   from what I've been able to figure out the thi...   Jul 31 2008, 06:34 AM
watsonrx13   Thanks Steve, that's what I thought... -- Rob   Jul 31 2008, 07:30 AM
watsonrx13   Time for an update.... Received new FI fuel pump ...   Aug 12 2008, 06:54 PM
swl   Yes. The power that energizes the main power rela...   Aug 12 2008, 08:58 PM
swl   also looks like the same contacts on the ignition ...   Aug 12 2008, 09:12 PM
watsonrx13   First off, I want to thank everyone (especially St...   Aug 24 2008, 01:25 PM


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