 Fuel Pump wont run off relay board... |
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| D1A3 |
  Jul 17 2010, 06:30 PM
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Gruppe Neun Vierzehn Südosten  Group: Members Posts: 362 Joined: 3-June 04 From: Atlanta, GA Member No.: 2,152 Region Association: South East States  |
Car died a few weeks ago while driving it and I think I know what is causing it...
Turns out, my fuel pump was not getting power. I temporarily rigged up the pump to run off my driving light relay and the car runs great. I traced the harness power wire (black/red stripe) back all the way to the relay board and could not find any break/melting or anything suspect. I found in the Haynes Manual that the fuel pump relay should have voltage at 86 and ground at 85. Guess what? I checked and have voltage at 86, but NO ground at 85. The manual says in this case to check the "main relay." What the heck is that? It references the "fuel pump relay" in other places uniquely, so wondering what a "main relay" is on our cars. Also, mentions that there could be an open circuit causing the ground to fail. What should I check? The relay being used is known to be good, so any ideas or am I looking at replacing the relay board? Thanks everyone! |
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| D1A3 |
Feb 20 2011, 05:44 PM
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Gruppe Neun Vierzehn Südosten Group: Members Posts: 362 Joined: 3-June 04 From: Atlanta, GA Member No.: 2,152 Region Association: South East States |
OK, Just FINALLY completed a permanent fix for the Fuel pump issue!
To get me by, I had wired the fuel pump into my fog light switch. Worked fine, ran some good auto-crosses and perhaps had a great anti-theft/emergency fuel cutoff... Tonight I am happy to report that the issue has been resolved. :-) After checking everything that was suggested and running some of my own tests to verify the continuity of the power wire to the fuel pump, I replaced the relay board. Special thanks goes to Al Meredith for his help to locate one for me. (IMG:style_emoticons/default/beerchug.gif) I know everyone says the relay boards don't go bad, and the one coming out actually looked pretty good (visually speaking). But, good looks don't mean all is well underneath... Thanks again for everyone's support and you will see me around Atlanta a lot more now that I don't have this to worry about any longer. (IMG:style_emoticons/default/driving.gif) |
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Posts in this topic
D1A3 Fuel Pump wont run off relay board... Jul 17 2010, 06:30 PM
904svo Jason, that ground on pin85 comes from the ecu har... Jul 17 2010, 06:36 PM D1A3 Thanks Larry. Going to check that now.
BTW: I... Jul 17 2010, 07:53 PM D1A3 Larry,
Checked the grounds that are just on the p... Jul 17 2010, 09:26 PM Cap'n Krusty Two words of advice: "wiring diagram". ... Jul 17 2010, 10:53 PM swl disconnect the 4 pin connector and jump Pin III to... Jul 18 2010, 07:21 AM SLITS Check the main gorund bundle, near relay board on ... Jul 18 2010, 08:18 AM ahdoman Also, don't forget the two fuses on the board ... Jul 18 2010, 04:25 PM blitZ Did you try swapping out the fuel pump relay on th... Jul 19 2010, 07:41 AM
markb Glad you figured it out. I had a relay board that ... Feb 20 2011, 06:11 PM |
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