Mack Snow Fighter Posted December 12 Share Posted December 12 Hello, On my 95 mack with the EM7 engine, I have a fuel leak right where the injector line screws into the head. Its the #1 cylinder, closest to the front. This one has a different style tube from the others for some reason, and it has been a problem over the years. A couple years ago, I had a leak there after removing an injector, so I replaced the line and it solved the problem. Now its begun to leak slightly. I tried re-sealing the injector, but it still leaks. Any suggestions? Thanks a lot for your help. Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/ Share on other sites More sharing options...
Joey Mack Posted December 12 Share Posted December 12 is the new line a Mack line or aftermarket? You may get lucky by pulling the line and using a 400 grit or higher emory cloth and buff the ball ends to get the groove out. I do it on E-Techs with sucess.. I pinch the emory cloth between my thumb and pointer finger, and rotate the line back and forth.. it doesnt require a lot of buffing, i just do it till the groove is gone or nearly gone. If you have another injector, check to see if the spacer tube thingy on the end of the line is not touching the injector. you can do that in your hand. I remember years ago, the ball on the end of the line was small, and that tube thingy would nearly touch the injector, which when torqued down it will not have the correct pressure to seal the ball into the injector port.. I have taken the line to the bench grinder and put a chamfer on the tube thingy to make sure it would not press against the injetor. I hope I typed this in a way that is easy to understand... Jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563854 Share on other sites More sharing options...
Geoff Weeks Posted December 13 Share Posted December 13 If all else fails: https://cohpro.com/product-category/metal-tube-fittings/diesel-fuel-injection/ Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563858 Share on other sites More sharing options...
Geoff Weeks Posted December 13 Share Posted December 13 Glenn, had a place in the US but I can't find it anymore? Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563859 Share on other sites More sharing options...
70mackMB Posted December 13 Share Posted December 13 15 hours ago, Joey Mack said: I hope I typed this in a way that is easy to understand... He should, like you he is from Maine also! lol .....Hippy 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563883 Share on other sites More sharing options...
Joey Mack Posted December 13 Share Posted December 13 Ayuh' 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563890 Share on other sites More sharing options...
Geoff Weeks Posted December 13 Share Posted December 13 genuwine Maine native, out numbered but not out smaaated! Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563899 Share on other sites More sharing options...
Joseph Cummings Posted December 13 Share Posted December 13 18 hours ago, Geoff Weeks said: If all else fails: https://cohpro.com/product-category/metal-tube-fittings/diesel-fuel-injection/ I've got to save this link. I've had to make lines before and had to scrounge through junk piles to find stuff Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563901 Share on other sites More sharing options...
Joseph Cummings Posted December 13 Share Posted December 13 20 hours ago, Joey Mack said: is the new line a Mack line or aftermarket? You may get lucky by pulling the line and using a 400 grit or higher emory cloth and buff the ball ends to get the groove out. I do it on E-Techs with sucess.. I pinch the emory cloth between my thumb and pointer finger, and rotate the line back and forth.. it doesnt require a lot of buffing, i just do it till the groove is gone or nearly gone. If you have another injector, check to see if the spacer tube thingy on the end of the line is not touching the injector. you can do that in your hand. I remember years ago, the ball on the end of the line was small, and that tube thingy would nearly touch the injector, which when torqued down it will not have the correct pressure to seal the ball into the injector port.. I have taken the line to the bench grinder and put a chamfer on the tube thingy to make sure it would not press against the injetor. I hope I typed this in a way that is easy to understand... Jojo Years ago I bought some PAI lines for 237s and I had problems like that and they leaked. I had a fleet from a steel company that whoever worked on them before wasn't careful about the clamps and brackets. I bought a bunch of those PAI ones for stock because they were cheap 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563902 Share on other sites More sharing options...
Geoff Weeks Posted December 13 Share Posted December 13 25 minutes ago, Joseph Cummings said: I've got to save this link. I've had to make lines before and had to scrounge through junk piles to find stuff There used to be a North American supplier that had all the ends, nuts and tube, I just can't find a link for it, may be putting the wrong search terms in Google. In an emergency I have made a repair to a Leyland 680 (very similar to Mack) by taking the line off, cleaning and wrapping iron baling wire tight over the defect extending out from each end, then carefully brazing over the wire wrap. Far from a perfect repair but enough to get by until a new line could be flown in. Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563904 Share on other sites More sharing options...
Joseph Cummings Posted December 13 Share Posted December 13 21 minutes ago, Geoff Weeks said: There used to be a North American supplier that had all the ends, nuts and tube, I just can't find a link for it, may be putting the wrong search terms in Google. In an emergency I have made a repair to a Leyland 680 (very similar to Mack) by taking the line off, cleaning and wrapping iron baling wire tight over the defect extending out from each end, then carefully brazing over the wire wrap. Far from a perfect repair but enough to get by until a new line could be flown in. The ones I did I used silver solder, but that stuff is crazy expensive now. I had a lot of it at one time because I bought a service truck from a refrigeration co and they left like 5 pounds of it all over the bottom of the tool bins. Now I have some but I keep it locked up in my desk drawer Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563905 Share on other sites More sharing options...
Joseph Cummings Posted December 13 Share Posted December 13 42 minutes ago, Geoff Weeks said: There used to be a North American supplier that had all the ends, nuts and tube, https://www.granit-parts.us/e/category/Engine/Fuel/GRANIT-fuel-injection-lines?locale=us Is this it? Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563906 Share on other sites More sharing options...
Geoff Weeks Posted December 13 Share Posted December 13 I don't think that is the site I remember, it had all kinds of nuts and cones for small engines all the way up to big marine engines. But still, it is a good resource. Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563908 Share on other sites More sharing options...
Mack Snow Fighter Posted December 13 Author Share Posted December 13 On 12/12/2024 at 4:03 PM, Joey Mack said: is the new line a Mack line or aftermarket? You may get lucky by pulling the line and using a 400 grit or higher emory cloth and buff the ball ends to get the groove out. I do it on E-Techs with sucess.. I pinch the emory cloth between my thumb and pointer finger, and rotate the line back and forth.. it doesnt require a lot of buffing, i just do it till the groove is gone or nearly gone. If you have another injector, check to see if the spacer tube thingy on the end of the line is not touching the injector. you can do that in your hand. I remember years ago, the ball on the end of the line was small, and that tube thingy would nearly touch the injector, which when torqued down it will not have the correct pressure to seal the ball into the injector port.. I have taken the line to the bench grinder and put a chamfer on the tube thingy to make sure it would not press against the injetor. I hope I typed this in a way that is easy to understand... Jojo The new line is genuine Mack. I think if I had another injector in and tube in hand, I could understand what you are talking about. Why do they make the #1 cylinder different from all the rest? Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563913 Share on other sites More sharing options...
Joey Mack Posted December 13 Share Posted December 13 only the bends are different, the ends have to be the same. I wish I could see the issue first hand.. Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563914 Share on other sites More sharing options...
Mack Snow Fighter Posted December 13 Author Share Posted December 13 3 minutes ago, Joey Mack said: only the bends are different, the ends have to be the same. I wish I could see the issue first hand.. Hmmm, so now I'm wondering, did they update the lines or something, because the other cylinders that I never replaced have a two piece set up, in other words, you can disconnect the line right at the head, whereas, the line I have in the #1 cylinder the nut is attached to a tube that goes all the way in to the injector, whereas the older ones there is like a 6 inch or so tube that goes in the head to the injector, and a separate line that attaches to that. Hope I am making sense. Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563915 Share on other sites More sharing options...
Joey Mack Posted December 13 Share Posted December 13 so it has lines like a John Deere dozer engine for example.. For some reason, I dont remember that on and E-7... I forgot the name of the short injector tubes.. the bad line will have a 4'' ish tube over the line with nuts that are made into the line.. when you tighten the nuts on those, you tighten the inner one first, 3/4'' wrench, then you tighten the dust nut over that, 13/16'' wrench.. Pictures would help. Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563916 Share on other sites More sharing options...
Mack Snow Fighter Posted December 13 Author Share Posted December 13 I'm actually out of town now. When I get back I'll pull the line out completely and take a look, I can get pictures then. Maybe we are over tightening that line, resulting in damage. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563920 Share on other sites More sharing options...
Joey Mack Posted December 13 Share Posted December 13 are you the guy that is using O'Connor Mack in Westbrook for your parts and service? Gary Chamberlain is the shop foreman.. Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563921 Share on other sites More sharing options...
Mack Snow Fighter Posted December 13 Author Share Posted December 13 This is what mine looks like on cylinder #1. Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563922 Share on other sites More sharing options...
Mack Snow Fighter Posted December 14 Author Share Posted December 14 5 hours ago, Joey Mack said: are you the guy that is using O'Connor Mack in Westbrook for your parts and service? Gary Chamberlain is the shop foreman.. Yes, I use O'Connor. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-563947 Share on other sites More sharing options...
The Heinz Posted December 16 Share Posted December 16 I haven't seen a truck so far with #1 injection line being different from the others, normally all are the same part number. Of course, there could be an outlier, but one being different doesn't sound normal. Did a previous owner only replace one or something? Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-564056 Share on other sites More sharing options...
Mark T Posted December 16 Share Posted December 16 When the injector was out of it, are you sure it didn't end up with 2 washers down by the tip ? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-564057 Share on other sites More sharing options...
fjh Posted December 17 Share Posted December 17 On 12/16/2024 at 4:45 AM, The Heinz said: I haven't seen a truck so far with #1 injection line being different from the others, normally all are the same part number. Of course, there could be an outlier, but one being different doesn't sound normal. Did a previous owner only replace one or something? Older versions of these had a jam nut! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-564201 Share on other sites More sharing options...
Chanzoid Posted Wednesday at 10:10 PM Share Posted Wednesday at 10:10 PM If re-sealing the injector didn’t fix it, I’d check if the injector line itself is cracked or damaged. Sometimes these lines can develop hairline fractures that only leak under pressure. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74862-fuel-leak-on-em7-engine/#findComment-564237 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.