dasbulliwagen Posted October 26, 2009 Share Posted October 26, 2009 Is the ballast resistor really needed? If I can jump it and get the engine to run would it be ok to leave it jumped, or does it really need to be there? This is on an 88 4.0 auto 4x4 Olympic edition. Link to comment Share on other sites More sharing options...
Pete M Posted October 26, 2009 Share Posted October 26, 2009 The ballast resistor is Jeep's way of lessening the rpms of the fuel pump for quieter running. Link to comment Share on other sites More sharing options...
Geonovast Posted October 26, 2009 Share Posted October 26, 2009 It's not necessary, but it's been suggested that it helps the pump live longer. Link to comment Share on other sites More sharing options...
jpnjim Posted October 27, 2009 Share Posted October 27, 2009 I've done it, I also replaced it as soon as I could (= as soon as I got home). My understanding has always been, the pump is designed to run at 12-13v. When you're starting off battery power, you're in the right range, once the engine fires, and the alternator starts producing, you need the ballast resistor to bring the voltage back into range. Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 27, 2009 Share Posted October 27, 2009 My understanding has always been,the pump is designed to run at 12-13v. When you're starting off battery power, you're in the right range, once the engine fires, and the alternator starts producing, you need the ballast resistor to bring the voltage back into range. Well said, and exactly right. Unless you enjoy replacing fuel pumps prematurely, keep it in the circuit, and keep the contacts clean. Link to comment Share on other sites More sharing options...
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