dangerous Posted November 30, 2014 Share Posted November 30, 2014 (edited) Have power to 3 wires coming to the pump 12 v to 2 of them and like 4.5 to another but the pump wont start when key is on or when the engine is being cranked. The pump works fine when jumped from the battery though so that is not it, and tried another ECU and that's when we started getting the power back in 3 wires previously only had power to 2 of them. The blue/yellow wire is getting 12v, the green/blue or grey is getting 11.8v, and the light blue solid is getting 4.3v all at the plug at the pump. Any ideas seriously need some help!!!!!! Jumped through the relay also and nothing. Edited November 30, 2014 by dangerous Link to comment Share on other sites More sharing options...
lmdew Posted November 30, 2014 Share Posted November 30, 2014 The pump will cycle on for a few seconds when you first turn the key on and then turn off, this is normal operation. If the fuse is good, you should have power to the pump. Your pump may be going bad, pulling more amps than normal. Worked off the battery cause of the high CCA. Search fuel pump, there was just a thread on this last week or two. Turned out to be a bad pump. Fixed with a good used Subaru pump from the yard. Your meter can lie to you if you are just checking voltage. Check out the Load Pro at www.brighterideas.com Larry Link to comment Share on other sites More sharing options...
dangerous Posted November 30, 2014 Author Share Posted November 30, 2014 Larry we did put in a fuel pump, and the whole mounting from another 97. The thing was is that even both pumps worked when we jumped them, and also spliced in a new male plug to the ends of the wires to fit the female on the pump mount thinking it maybe was a bad plug. We've also tried 2 other fuel pump relays from cars at my friends shop, and nuthin. Link to comment Share on other sites More sharing options...
porcupine73 Posted November 30, 2014 Share Posted November 30, 2014 If you tried an ECU, the fuel pump relay, a fuel pump, and a harness plug, and it's still not working right, it seems like there must be a wiring issue of some sort? Are you expecting to see the fuel pump running continuously with the key in run but engine not running? Link to comment Share on other sites More sharing options...
dangerous Posted November 30, 2014 Author Share Posted November 30, 2014 (edited) The fuel pump isn't running at all even though there's power at the male end of the plug. So we're scratching our heads cause it doesn't make any sense. Now we hotwired the pump and it's working, but the car won't start theres no spark and no blown fuse. Wondering if having messed with this so much, and having no spark if the main relay got blown?? Not even sure what all the main relay controls? Edited December 1, 2014 by dangerous Link to comment Share on other sites More sharing options...
lmdew Posted November 30, 2014 Share Posted November 30, 2014 Run a couple of single strands of wire in the connector, so you can read voltage with the pump hooked up. I bet you will see different readings. 1 Link to comment Share on other sites More sharing options...
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