Perkins 4108 diesel leak at fuel line connections - SailNet Community
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post #1 of 7 Old 07-02-2016 Thread Starter
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Perkins 4108 diesel leak at fuel line connections

My fuel lines that feed in and out of my engine-mounted fuel filter housing (the secondary) are leaking at the connections. They are steel lines which attach to the filter housing using compression fittings that consist of a sleeve and a small plastic grommet (an olive) that both slide onto the end of the fuel line.

My filter is more or less like this one:

Perkins Fuel Filter Assembly Kit

The problem is, I can't seem to make a perfect seal. It leaks at the fittings while running.

Is there some trick to making this seal work? I've cranked it on pretty hard. Perhaps I'm over-torquing and crushing the grommet? Or perhaps I need to line up the sleeve/olive and line more accurately?

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Last edited by MikeOReilly; 07-02-2016 at 03:32 PM.
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post #2 of 7 Old 07-02-2016
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Re: Perkins 4108 diesel leak at fuel line connections

I am having a similar problem with my Yanmar. Had to remove the fuel line at the injector pump to replace a rounded off bleed screw and it has been dripping ever since. Took it completely off once, carefully cleaned all the surfaces, installed new copper washers (gaskets) and it's better but still drips a bit. Next step is applying a bit of Permatex I guess.
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post #3 of 7 Old 07-02-2016
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Re: Perkins 4108 diesel leak at fuel line connections

I suspect the grommet, once over tightened, doesn't like it. Fatigue fractures in the steel pipe ??
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post #4 of 7 Old 07-02-2016 Thread Starter
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Re: Perkins 4108 diesel leak at fuel line connections

Thanks guys. I'm thinking that over-torquing is the problem. I'm going to ease off on the sleeve and replace the grommet (olive). I have a few extras to play with. If this doesn't work, then maybe it's Permatex for me as well.

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Re: Perkins 4108 diesel leak at fuel line connections

Do it up finger tight, with a new olive. With a spanner/wrench nip til it feels secure then only a 1/4 turn to finish.

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Re: Perkins 4108 diesel leak at fuel line connections

Perkins are tempermentle, what with olives and cork gaskets to crush. Fine line of torque here. Just enough, but not too much. Not sure why you are loosening all of these? To get my filter off I have to take off the return line, as it blocks access to the top mounting bolt for the filter. Then use the banjo bolt on the line to the fuel injection pump to bleed the air.

I noticed you have an after market kit for the OEM engine fuel filter...I read through your link....

From your link:

To finish the job off properly it is best to renew the seals and washers on the various fuel line connections, so we include a full selection of these in the kit along with a pair of solid brass fuel line sleeve nuts which will not corrode!

Any chance you RTFM'd?


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Re: Perkins 4108 diesel leak at fuel line connections

Going to bed now. Back at it tomorrow. Like I say, I'm going to try a new olive without torquing the heck out of it.

The origin of this problem seems to be following our problems with our injector pump. We had to take the pump off to be reconditioned (did the injectors too). My theory is that when we removed the lines from the injector pump that we somehow torqued or contorted the connections at the filter housing (which we left in place). This produced the fuel leak which we're now fighting with.

BTW, it was hard to identify this leak. I noticed the diesel on the filter housing, so replaced the filter and rubber O-rings a couple of times, thinking they were leaking. The fuel lines join the housing at the aft, so I have to be on top of the engine when it is running to see the leak. Fun fun...
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