MHfred Posted September 25, 2011 Share Posted September 25, 2011 My 89 MH612 has a Con Met fuel /water separator on it. When I pressurized the fuel tank in an attempt to get it started after sitting for many years(I just bought it) I managed to blow a hole in the top of the separator. I bypassed the in and out lines with a pipe nipple but there is a third line that comes off near the center and goes toward the engine. I attempted to follow the hose but could not and the truck is not at my house. Where does that line go? Will anythng be damaged or cause a problem if I cap that line? This is a non-heated model. Thanks,Fred Quote Link to comment Share on other sites More sharing options...
farmer52 Posted September 25, 2011 Share Posted September 25, 2011 Fred,I am just guessing but could it be the fuel injection pump return line? Or does the FI pump return to the tank? Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
MHfred Posted September 25, 2011 Author Share Posted September 25, 2011 There is a return line back into the left tank.Fred Quote Link to comment Share on other sites More sharing options...
daveigou Posted September 25, 2011 Share Posted September 25, 2011 Could it maybe be just a remote drain line so when you tap the water off it goes somewhere under the truck instead of bleeding it off down over the frame rail and whatever? Quote See my Flickr photostream page http://www.flickr.com/photos/96692978@N05/ Link to comment Share on other sites More sharing options...
MHfred Posted September 25, 2011 Author Share Posted September 25, 2011 I don't think so because there is a drain directly off the bottom. Quote Link to comment Share on other sites More sharing options...
MHfred Posted September 26, 2011 Author Share Posted September 26, 2011 My memory was not very good after 3 months. The third line came off the bottom and side of the unit. I contacted the Mack Museum and they told me that the third line goes to the unloader on the air compressor to trigger the bleed valve on the separator. They also sent me a drawing. The museum is manned by good people and is a valuable asset.Fred Quote Link to comment Share on other sites More sharing options...
farmer52 Posted September 27, 2011 Share Posted September 27, 2011 I contacted the Mack Museum and they told me that the third line goes to the unloader on the air compressor to trigger the bleed valve on the separator. They also sent me a drawing. The museum is manned by good people and is a valuable asset.FredFred,Something does not sound right. If the drain valve opens via the unloader it will "spill" water and fuel.I would suggest changing it to a Mack spin on primary filter. Does it have a spin-on secondary filter. My primary is located on the left side of the engine and the secondary is located on the right front frame rail (just inside the right front tire).Yes Don and his crew at the Museum are great! Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
MHfred Posted September 27, 2011 Author Share Posted September 27, 2011 Ken, I have a primary and seconday just as you have. I think that the separator allows the water to flow in a chamber since it is heavier and the drain valve comes off that chamber. I don't know if I will replace the separator or not.Fred Quote Link to comment Share on other sites More sharing options...
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