Doc. Posted February 25, 2016 Share Posted February 25, 2016 So, I had an issue with my 87 MJ 4.0 . It would start and run fine, showed good fuel pressure, but once it got warmed up it had no power, couldn't go much above an idle without stumbling badly. The longer it ran the worse it got (to the point of dying and would not restart). The next morning it fired right up again and then once warmed up same story. I kept thinking about how it was acting up and wondered if it could be the rubber line from the pump to the steel line in the tank. I was thinking it had a cracked line and the longer it ran (getting warm and stressed from fuel running through it) the farther the crack would open up. Today I tore it down and pulled it out to find a hose that was soft and swelled up, PLUS a hose clamp had came loose. So, new hose and nice tight clamps I hope to have my problems behind me. Well at least that problem. I decided to do a few, while I'm there redo's before putting tank etc. back together, so it will be a few days till I can go try it out and make sure that was the cure. But, I'm feeling good about what I found for what my issue was. Anyone else ever had such an odd problem? Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 25, 2016 Share Posted February 25, 2016 That's why they make fuel injection hose clamps. They don't come loose. Use them on every rubber hose connection on the fuel lines. Link to comment Share on other sites More sharing options...
gogmorgo Posted February 25, 2016 Share Posted February 25, 2016 I've also found that the worm gear type hose clamps aren't the best choice for smaller diametre lines because the gear can slice through the lines. They also don't react well to overtightening. Just about every motorsport organizing body bans them for use with fuel lines because of their tendency to fail. Like Hornbrod said, get the proper ones. Link to comment Share on other sites More sharing options...
Doc. Posted February 25, 2016 Author Share Posted February 25, 2016 Interesting. With no knowledge of anything about me or my vehicle, you guys assume I have the wrong parts in there and that I did something wrong along the way. Why is this? Why not accuse me of putting vacuum line on instead of fuel line while you're at it? The hose clamp (that came loose) and fuel line that was failing were there from the factory. Thanks guys, your comments really make a guy feel good for sharing. Link to comment Share on other sites More sharing options...
gogmorgo Posted February 25, 2016 Share Posted February 25, 2016 I apologize for putting you down, although that was never my intention. I believed your purpose was to educate anyone else who read this about a problem and solution, and I only intended to further this, as I thought Hornbrod's argument for their use wasn't the strongest. Again, I apologize. Link to comment Share on other sites More sharing options...
87MJTIM Posted February 25, 2016 Share Posted February 25, 2016 Judging from the symptoms you described, you probably mistreat your pets. ;) ;) (just kidding) Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 25, 2016 Share Posted February 25, 2016 My 91 had both worm drive adjustable clamps and constant pressure clamps on the fuel supply line rubber connections. I replaced them all with adjustable fuel pressure clamps to prevent further leaks. Damn Doc - lighten up man. No one's picking on you, everyone's just trying to help. Link to comment Share on other sites More sharing options...
Egm89 Posted February 26, 2016 Share Posted February 26, 2016 Chill out Doc, fhey just trying to help. Link to comment Share on other sites More sharing options...
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