HJones Posted December 27, 2010 Share Posted December 27, 2010 Has anyone out there experienced starting problem's with a mack Quantum 2000 model 470hp semi? Ive changed the lift pump and have gone all over the fuel system cannot not see any reason for fuel to be draining back. The motor will turn over no dramas but now and then wont start, i'm starting to think something electrical, maybe ECU I'm not Sure!Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/17028-starting-dramas/ Share on other sites More sharing options...
cgallamore Posted December 28, 2010 Share Posted December 28, 2010 Has anyone out there experienced starting problem's with a mack Quantum 2000 model 470hp semi? Ive changed the lift pump and have gone all over the fuel system cannot not see any reason for fuel to be draining back. The motor will turn over no dramas but now and then wont start, i'm starting to think something electrical, maybe ECU I'm not Sure!Thanksi had a bad ignition switch do that Quote http://www.bigmacktrucks.com/uploads/1272400769/gallery_4852_794_314995.jpg Link to comment https://www.bigmacktrucks.com/topic/17028-starting-dramas/#findComment-69306 Share on other sites More sharing options...
bobo Posted December 28, 2010 Share Posted December 28, 2010 Have you checked the fuel over flow/return valve. Bobo Quote Link to comment https://www.bigmacktrucks.com/topic/17028-starting-dramas/#findComment-69317 Share on other sites More sharing options...
HJones Posted December 28, 2010 Author Share Posted December 28, 2010 i had a bad ignition switch do that Quote Link to comment https://www.bigmacktrucks.com/topic/17028-starting-dramas/#findComment-69319 Share on other sites More sharing options...
HJones Posted December 28, 2010 Author Share Posted December 28, 2010 i had a bad ignition switch do thatWhen u had dramas with the ignition switch did the motor actually turn over ? Quote Link to comment https://www.bigmacktrucks.com/topic/17028-starting-dramas/#findComment-69320 Share on other sites More sharing options...
HJones Posted December 28, 2010 Author Share Posted December 28, 2010 Have you checked the fuel over flow/return valve. Bobo Yeah i have checked that valve and it seems to be working fine, i just seem to think it may be electrical related, i am aware that this problem has occured before due to a local mechanic i spoke to and apparently all they do is jump start the truck every morning otherwise it will turn over and wont fire seems crazy. Batteries have been changed on these trucks fuel pumps wiring lumes u name it, the only thing that hasn't been changed is the ECU but on the the other hand i've hered that there may be away of wiring the batteries a little different maybe with larger cable to deliver more power !Thanks heith Quote Link to comment https://www.bigmacktrucks.com/topic/17028-starting-dramas/#findComment-69321 Share on other sites More sharing options...
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