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> Fuel Pump runs constantly., Relocated and rewired by PO.
Crash207
post Jun 8 2011, 05:10 PM
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Hey guys.

73 1.7 D-Jet. 3 port Bosch fuel pump (now located under the fuel tank) runs constantly and is a bit loud. I read that it is supposed to run for 1-1.5 seconds and stop with key on engine off. Checked wiring and found it is wired directly to Fuse #8 on the fuse panel. Where should it be wired?

Side note. Car sat for 5 years before i rescued it and the fuel pump had power but didn't run until i whacked it a few times.

Thanks in advance, You guys are awesome and your expertise is much appreciated.
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Tom
post Jun 9 2011, 10:13 AM
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Rich said, "All electrical power is diverted to the starter when cranking...all of it."
Rich,
This is not true, and you say it is not a safety issue, well I would disagree. It would certainly be a safety issue if the pump ran all of the time and you had a fuel leak. Just turning the key to on could cause a lot of fuel on the ground rather quickly, don't you think.
Look at the relay board schematic. Follow the yellow wire trace from pin 6 of the 12 pin connector. It also goes to the ECU to allow ground to appear at pin 86 of the fuel pump relay. So, among other things, such as the coil, the fuel pump is powered up at start, not just the starter.
Tom
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Posts in this topic
Crash207   Fuel Pump runs constantly.   Jun 8 2011, 05:10 PM
jsayre914   Hey guys. 73 1.7 D-Jet. 3 port Bosch fuel pump (...   Jun 8 2011, 05:14 PM
Crash207   No aftermarket switch but i could add one. Should ...   Jun 8 2011, 05:20 PM
SirAndy   No aftermarket switch but i could add one. Should ...   Jun 8 2011, 05:26 PM
jsayre914   Someone eleses opinion :D :chow: http://www.pel...   Jun 8 2011, 05:29 PM
SirAndy   Someone eleses opinion :D :chow: http://www.pel...   Jun 8 2011, 05:32 PM
jsayre914   [quote name='jsayre914' post='1490564' date='Jun ...   Jun 8 2011, 08:22 PM
Tom   There is a good reason why the fuel pump only runs...   Jun 8 2011, 07:09 PM
r_towle   Its really not a safety issue. the pump turns on f...   Jun 8 2011, 11:25 PM
Derek Seymour   Mine is from a fucking Volvo and sounds like a sew...   Jun 8 2011, 11:37 PM
McMark   Its really not a safety issue. the pump turns on ...   Jun 8 2011, 11:53 PM
Crash207   So if for some reason the old wiring is not there,...   Jun 9 2011, 09:27 AM
Cap'n Krusty   If the pump is loud, it's been relocated, and ...   Jun 9 2011, 09:48 AM
Crash207   I replaced all the fuel lines with pressure rated ...   Jun 9 2011, 10:04 AM
Cap'n Krusty   I replaced all the fuel lines with pressure rated...   Jun 9 2011, 10:25 AM
r_towle   If the pump is loud, it's been relocated, and...   Jun 9 2011, 12:43 PM
Tom   Rich said, "All electrical power is diverted ...   Jun 9 2011, 10:13 AM
rjames   The PO rewired my fuel pump this way, too. :headb...   Jun 9 2011, 11:48 AM


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