Spenceeros Posted April 22, 2009 Share Posted April 22, 2009 I have a 92 pathfinder and lately the fuel pump keeps running for about 30-45 seconds after I turn off the engine. Is this a result of a leak in the lines or a faulty fuel regulator? I haven't done a pressure check yet but am assuming that's probably the next step. Link to comment Share on other sites More sharing options...
Terrano1992 Posted April 22, 2009 Share Posted April 22, 2009 (edited) I have a 92 pathfinder and lately the fuel pump keeps running for about 30-45 seconds after I turn off the engine. Is this a result of a leak in the lines or a faulty fuel regulator? Fuel system on 1987-95 Pathfinders does not have any type of "fuel pressure" electronic sensors. Check "fuel pump" relay under the hood (worn-out relay contacts can be "sticky"). You can temporarily swap it with another near-by green relay, just for test. Also check contact group of ignition switch. Normally, there is no power (+12V) on any fuel pump relay contact (pin), when ignition key turned to "OFF" or "ACC" position. Edited April 22, 2009 by Terrano1992 Link to comment Share on other sites More sharing options...
Spenceeros Posted April 23, 2009 Author Share Posted April 23, 2009 Yea I think it was the fuel relay. I switched it out with the blue 4 pin for my a/c, since that doesn't work. I'm assuming that the only thing that is different with the relays is the color. Link to comment Share on other sites More sharing options...
Terrano1992 Posted April 24, 2009 Share Posted April 24, 2009 (edited) Yea I think it was the fuel relay. I switched it out with the blue 4 pin for my a/c, since that doesn't work. I'm assuming that the only thing that is different with the relays is the color. Coil resistance of green relay is nearly 1.5-2 times higher than blue - it's only difference. Edited April 24, 2009 by Terrano1992 Link to comment Share on other sites More sharing options...
Spenceeros Posted April 24, 2009 Author Share Posted April 24, 2009 So should I not be running a blue relay in the fuel pump spot? Is there going to be a possibility of an under/over volt? Link to comment Share on other sites More sharing options...
Terrano1992 Posted April 25, 2009 Share Posted April 25, 2009 So should I not be running a blue relay in the fuel pump spot? Is there going to be a possibility of an under/over volt? Lower coil resistance puts excessive load at ECU transistor switch. You can temporarily replace green relays with blue, but this is not recommended for long term use. Link to comment Share on other sites More sharing options...
ganeca81 Posted May 26, 2009 Share Posted May 26, 2009 hi, i dont if this thing does it, but i had same problem with mine and i had my mech fixed it. i just changed the engine gasket, the seal valve, intake seal and clean the valves...voila good as new and sound much better when first start the engine..... Link to comment Share on other sites More sharing options...
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