Compression fittings at injector leaking - SailNet Community
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post #1 of 7 Old 08-12-2012 Thread Starter
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Compression fittings at injector leaking

I just replaced the copper washers at the bottom of my injectors, and now I have a leak at one of the fittings where the fuel pipe connects to the injector with a compression fitting. Is it common to use some sort of sealant (teflon paste or tape) on the fittings? I'd hate to get some teflon tape in the injector!

Advice from experience?

Thanks

PK

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post #2 of 7 Old 08-12-2012
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Did you put them in the right way? One side is down the other up, but once crushed they need to be replaced perhaps they haven't seated, loosen the nuts then retighten them. Don't over tighten, if your unsure check your manual for the proper torque.
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post #3 of 7 Old 08-12-2012
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Re: Compression fittings at injector leaking

Are you talking about the crush washers on the return line? Usually the high pressure supply line is a flare fitting on the top of the injector. If the crush washers on the return are leaking get two new washers and torque to factory specs.

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post #4 of 7 Old 08-13-2012 Thread Starter
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Re: Compression fittings at injector leaking

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Originally Posted by jrd22 View Post
Are you talking about the crush washers on the return line? Usually the high pressure supply line is a flare fitting on the top of the injector. If the crush washers on the return are leaking get two new washers and torque to factory specs.
I should have been more accurate, yes I'm talking about the high pressure supply line. Where 11 meets 6.



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post #5 of 7 Old 09-09-2012
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Re: Compression fittings at injector leaking

High pressure fuel lines should be made up clean and dry - NEVER put anything in that area (even anti-sieze) that could be carried into the fuel injector and plug up the fuel passages / injector tip orifices. I would try: inspect the seating surfaces, carefully spraying the fuel line end and injector HP connection fitting with quick-dry degreaser, wipe clean with a lint-free rag, and re-torque to manufacturer's specs. If it still leaks, you may need to renew the HP fuel line and/or the injector inlet connector. High pressure diesel fuel is not very forgiving! Good luck, and let us know how you made out!
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post #6 of 7 Old 09-09-2012
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Re: Compression fittings at injector leaking

Sorry I didn't get back to you Preserved. I agree with what Bella said, no sealant. Most likely there is damage to one surface or the other or there is a crack in the line at the fitting.
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post #7 of 7 Old 10-27-2012
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Re: Compression fittings at injector leaking

Remove the line in question. It has a built in seat that fits into female counterpart on injector. Check line for imprint of previous "fit". One tiny grain of sand can interupt this. fuel can be up to 3000PSI here. an improper fit/ angle can upset previous fit. You may have to loosen injector a touch to rotate a touch... very small amount.You shouldnt have to coax line into where its going. If it has been bent, it may not reseat correctly into socket on injector.
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