Wirlybird Posted January 21 Author Share Posted January 21 12 hours ago, JoeH said: Not sure what the E6901 is. Is this an E6 engine? Or an endt675/6 engine? The ENDT engines use plastic fuel return leak off lines that jump from injector to injector and then run back down to the injection pump/fuel return I believe. These lines get brittle and crack eventually, and 99 times out of 100 I'd bet this is the cause for draining off fuel when sitting. Easy enough to buy a coil of this stuff from your Mack dealer and replace any that are damp. My friend said the E6901 was the engine. It is on a plaque on the hood. Quote Link to comment Share on other sites More sharing options...
JoeH Posted January 21 Share Posted January 21 Never heard of the 901 part of it. Quote Link to comment Share on other sites More sharing options...
Wirlybird Posted January 21 Author Share Posted January 21 46 minutes ago, JoeH said: Never heard of the 901 part of it. I'll have to ask my friend about it. I'll look for those plastic lines, when it warms up a bit, but I don't recall seeing them. Quote Link to comment Share on other sites More sharing options...
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