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mepstein |
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#1
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914-6 GT in waiting ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 19,876 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region ![]() ![]() |
I can't get my fuel pump to run unless I jumper the plug for the DME relay. The car starts and runs with the connection jumped but the fuel pump then runs all the time. Just want to know where to look and what to do.
I'm very electrically challenged so you might need to really dumb it down for me. Thanks |
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Spoke |
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#2
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Jerry ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 7,158 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None ![]() ![]() |
Looks like a pretty simple circuit:
1) Ignition key provides power to 86; 85 is ground thus top relay should turn on. 2) With top relay on, battery voltage from 30 connects to 87; 87 should be 12V. 3) 87 is also top of bottom relay coil; 85b from DME must be grounded to power bottom relay; bottom relay provides path from battery (pin 30) to 87b. Tests: Jam a small wire in plug for 87, install relay, turn ignition on, test 87 to ground; measure 12V Once 87 verified at 12V: Jam a small wire in plug for 85b, install relay, turn ignition on and/or crank the engine, test 85b to ground; measure 0V. DME should provide ground at 85b. If not, the issue is with the DME. |
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