 Fuel Pump, One more time |
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| Howard |
 Sep 25 2003, 06:15 PM
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#1
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Incontin(g)ent Member  Group: Benefactors Posts: 5,785 Joined: 24-July 03 From: Westlake Village, CA Member No.: 943 Region Association: None 
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Removed battery, cleaned engine (power washer), replaced all and now fuel pump does not run. Went through the standard checks, and all seems well, but no power delivered to pump. Put in new wires to pump and attached to battery to check. Pump runs fine, but concerned that ground wire does not need to be connected for pump to run. According to trouble shooter, pump should only ground for 1.5 seconds or so when ignition turned on. What the hell did I do wrong. About to have the beastie towed to Porsche, but that's admitting defeat. Stock 2.0 FI. Anyone make house calls?
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| porsche735 |
Sep 25 2003, 06:20 PM
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#2
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Member Group: Members Posts: 189 Joined: 10-January 03 From: Los Altos, CA Member No.: 127 |
Did you leave off the 4 pin connector at the relay board? Have you swapped your relays on the relay board?
Chris |
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| Howard |
Sep 25 2003, 06:36 PM
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#3
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Incontin(g)ent Member Group: Benefactors Posts: 5,785 Joined: 24-July 03 From: Westlake Village, CA Member No.: 943 Region Association: None
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Chris, 4pin is connected and relays have been swapped
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| JFJ914 |
Sep 26 2003, 12:28 PM
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#4
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Senior Member Group: Benefactors Posts: 813 Joined: 13-June 03 From: Alpharetta, GA Member No.: 814 Region Association: South East States
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| Brad Roberts |
Sep 26 2003, 12:41 PM
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#5
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
The pump gets it ground from the bundle of brown wires on the drivers side firewall near the relay board.
Take the fuel pump fuse out and clean it on both ends and clean the holder (with a small wire brush) Work backwards from the pump in electrical testing. Pull the cover off the 14 pin connector on the FRONT of the relay board and locate the fuel pump wire (stock one.. not the one you added) Plug everything back in like it was stock. Look up the fuel pump wire color in the Haynes manuel (I think its black with a red stripe) and put power to the small pin used for that wire. Now you will determine whether or not the wire and connector to the fuel pump are working. Keep working backwards towards the fuse and relay. If the fuse is blwon.. the wire for the AAR is touching to ground somewhere. B |
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| Howard |
Sep 26 2003, 01:07 PM
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#6
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Incontin(g)ent Member Group: Benefactors Posts: 5,785 Joined: 24-July 03 From: Westlake Village, CA Member No.: 943 Region Association: None
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Thanks John. I had already downloaded the chart and went through it one more time last night. Cleaned all the contacts and plugs on the relay board more carefully, and it started on the first kick.
Brad, I am running it off the new wiring, so pump just stays on when ignition is hot, not just the 1 or 2 seconds it should. Will trace that back tonight. And again, this is the greatest group. Answers to all my Porsche questions come in a flash. Will post my other problems (hitch in golf swing, bad tooth, kids getting a divorce, male pattern baldness) and expect the same quality responses. |
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| Brad Roberts |
Sep 26 2003, 01:09 PM
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#7
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
Correct. I want you to find the problem and pull your "band-aid" off the car. There is NO reason why anyone should be adding wires to their car. Fix what you have.. not skip it. You will learn a lot more about the car by fixing it correctly than you will by adding wires to it.
I want that 1-2 second prime to work... B |
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