pilgrim Posted December 14, 2013 Share Posted December 14, 2013 Hi, I have a 1996 Mack CL700 logger (recently purchased) and today when I went to fuel up I discovered that although the left tank was empty as per my fuel gauge but the right tank was full. The fuel was balancing out before between theses two tanks and nothing has been changed (no valves closed that were previously open). Hmmm... any ideas anyone? Quote Link to comment https://www.bigmacktrucks.com/topic/33879-fuel-tank-imbalance/ Share on other sites More sharing options...
j hancock Posted December 14, 2013 Share Posted December 14, 2013 Check the vents or vented caps.The cross over valve may be open but something could have plugged the line.Somebody missing a shop towel? Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/33879-fuel-tank-imbalance/#findComment-221289 Share on other sites More sharing options...
rsb502 Posted December 14, 2013 Share Posted December 14, 2013 Seen this 3 times, once the line had been pinched under the truck, once the valve had trash in it and once it was closed and the knob was stripped off. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/33879-fuel-tank-imbalance/#findComment-221301 Share on other sites More sharing options...
KECorbin22 Posted December 14, 2013 Share Posted December 14, 2013 Double check your vent lines entire line no crimps or flatten spots Quote Link to comment https://www.bigmacktrucks.com/topic/33879-fuel-tank-imbalance/#findComment-221307 Share on other sites More sharing options...
Superdog Posted December 14, 2013 Share Posted December 14, 2013 If they are plumbed anything like the CH's I've had,you don't have a crossover line at the bottom of the tanks with shutoffs.under the cab is a valve/jct block,whatever the proper name is that will freeze up in very cold weather. Had it happen more than once,a little hot water and all was well,till the next time it happened. Quote Link to comment https://www.bigmacktrucks.com/topic/33879-fuel-tank-imbalance/#findComment-221309 Share on other sites More sharing options...
pmolitor Posted December 14, 2013 Share Posted December 14, 2013 I've had the same problem as superdog mentions. Ended up taking pass tank off because I didn't need the capacity. Quote Link to comment https://www.bigmacktrucks.com/topic/33879-fuel-tank-imbalance/#findComment-221366 Share on other sites More sharing options...
Dirtymilkman Posted December 14, 2013 Share Posted December 14, 2013 All of my CL's and CH's except one had the bottom crossover line. You could order them either way. Because water weighs more than fuel your water can setlle in the crossover and freeze up. That small cross member that the line is attached to is bent so the line is lower than the tanks. I usually flip it upside down so the line is above the bottom of the tanks. It might leave 10 extra gallons in the tank though Quote Link to comment https://www.bigmacktrucks.com/topic/33879-fuel-tank-imbalance/#findComment-221375 Share on other sites More sharing options...
thomastractorsvc Posted December 14, 2013 Share Posted December 14, 2013 If they are plumbed anything like the CH's I've had,you don't have a crossover line at the bottom of the tanks with shutoffs.under the cab is a valve/jct block,whatever the proper name is that will freeze up in very cold weather. Had it happen more than once,a little hot water and all was well,till the next time it happened.I am with Mike, if no previous issues likely gelled/frozen fuel Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/33879-fuel-tank-imbalance/#findComment-221377 Share on other sites More sharing options...
pilgrim Posted December 14, 2013 Author Share Posted December 14, 2013 Thank you very much for the helpful tips and suggestions... I'll check it out further today. Quote Link to comment https://www.bigmacktrucks.com/topic/33879-fuel-tank-imbalance/#findComment-221420 Share on other sites More sharing options...
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