Generator fuel hard line leak
- Thread starter Steve91T
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- Pau Hana
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- 1989 PT52 Overseas Yachtfisher
Take off the fitting and check both mating surfaces for any foreign matter and cracks.
Next, ensure the fitting is square on the threads when reassembling.
Next, ensure the fitting is square on the threads when reassembling.
Maerin
Guru
I also suspect the nut is cross threaded. It also looks dirty, and appears that it was wrenched with pliers? Spray it with brake kleen, then inspect it carefully as mentioned before, and make sure the nut isn't cross threaded. Use a righteous wrench on it. It's a specialty flare connection, so it should spin pretty free right up to where it's tightening the flare. BTW, that's a steel injector line. If the nut is boogered up, you may have to get an OEM replacement line assembly. Good luck with the repair.
Last edited:
OP
OP
Steve91T
Guru
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Definitely not cross threaded. This line just decided to spring a leak. I even tried to snug it before removing it. I removed and re installed about 4 times trying to see what’s going on. The nut spins feely until it snugs.
When bumping the starter and watching closely, it almost appears to be leaking out of the back of the nut. Look closely at the end of the hard line right before it flares. It almost seems like a flared cap was pressed into the line. It seems to be leaking from there. Me messing with the line had made the leak much worse.
Do they sell pre bent injector lines? If they do that would make this a 5 minute fix.
When bumping the starter and watching closely, it almost appears to be leaking out of the back of the nut. Look closely at the end of the hard line right before it flares. It almost seems like a flared cap was pressed into the line. It seems to be leaking from there. Me messing with the line had made the leak much worse.
Do they sell pre bent injector lines? If they do that would make this a 5 minute fix.
Ski in NC
Technical Guru
The actual injection line shown can not be replaced with copper. Copper will fatigue and fail. These are steel purpose made for the cyclic high injection pressure.
Sounds like line may have cracked right where it goes into the ferrule. Take whole line off and inspect. Crack may be hard to see.
These are purpose made for the engine model, don't try to make one fit, go to the mfr. Tractor shops are one source.
Probably a Mitsubishi K3D. Engine model is cast into side of block right under where injection pump seats.
Sounds like line may have cracked right where it goes into the ferrule. Take whole line off and inspect. Crack may be hard to see.
These are purpose made for the engine model, don't try to make one fit, go to the mfr. Tractor shops are one source.
Probably a Mitsubishi K3D. Engine model is cast into side of block right under where injection pump seats.
FF
Guru
- Joined
- Oct 12, 2007
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- 22,552
When you locate a source keeping a full set on board is good insurance.
catalinajack
Guru
I have Lehman 120s. Recently, one of the very crooked lines running from the injector pump began leaking through the nut that tightens the flared end to the pump. Brian at American Diesel suggested loosening the line and re-tightening it. Didn't work so I replaced the line with a spare I had on on-board. No more leak. Inspection of the flared end of the line revealed no obvious defect but probably a hairline crack developed not apparent to the naked eye. My opinion, replace the line with original equipment. I keep a set of six on board just in case. Five years ago, just three days after getting underway with our newly-purchased boat, one of these lines fractured having work-hardened as the result of being hard against a hose clamp. Diesel sprayed all over the place but we caught it fairly quickly. We tied up for the night on one engine, replaced the line in the morning, and continued on our way. Our boat came with a full set of six. Never leave home without them.
catalinajack
Guru
No need to look. Just call Brian at American Diesel. He will have what you need in stock. He will need to know which one. From the front of the engine, the lines are numbered from one to six on the injector pump going to the back of the engine.
Maerin
Guru
I believe the OP is working on a Westerbeke, at least that's what the photos appear to be. 3 cyl. 8KW? Tractor dealer. Westerbeke will be 2 prices.
OP
OP
Steve91T
Guru
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Right. It was tough to see where it was coming from because when it was running because the fuel was a fine mist. But bumping the starter allowed me to see where it was leaking from.
Maerin
Guru
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