Fuel leak in injector pump - SailNet Community

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Old 04-10-2010
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Fuel leak in injector pump

Hello to all,
I have a Cat 30 with a M25xp diesel motor. Sometime ago I noticed a fuel leak where the injector pump screws into the block. (I think its the injector pump). The leak is pretty bad going into the bilge and causing the whole boat to stink. Is there some type of metal washer underneath that might be bad, or will tightening it do the trick. Only wrenches I had this time were standard. Any advice would be appreciated
Thanks, Russ
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Old 04-10-2010
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Have you done anything to the pump or injector lines lately? The metal tubes that supply the injectors with fuel are under high pressure. I would start checking where those lines fit into the injector pump. Maybe its leaking there and running down where that flange is and giving the appearance that it's leaking there. Check your dip stick too incase the pump is leaking in the body and leaking some fuel into your oil.
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Old 04-10-2010
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I would point out that over-tightening the fuel system banjo bolts can often cause the washers to distort and cause leaks. The washers are supposed to be replaced, as they are designed to be sacrificial...
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I think your probably right, the fuel line is leaking and not the pump. Do I need to try and just tighten it up?
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I would try that first myself. I think you can find a manual for that motor on the C-34 website, for a torque value. Injector lines have been known to split on the ends or perhaps just the vibration loosened something up.
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I don't know that engine or system, but if there are very thin copper washers, that look like copper "foil" ?

Those would be common "crush washers" which literally ARE copper foil. They are intended to distrot and conform to the shape of the joint they are sealing, and most folks are unaware that they are strictly "use once and replace" parts. REPLACEMENT IS MANDATORY. They will plague you with fuel or air leaks if you try to re-use them, so if your system does use them, order a box of a DOZEN so you have no incentive to re-use them. In many systems you would bleed air from the lines at these some points--and the process of loosening the line and then tightening it (bleeding) actually requires replacing the damned crush washer, or it will leak.

This is one reason why some of us will share quarters with a diesel engine, but we'll never love it.
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Yup...those are the beasties I'm talking about.. the crush washers for the damned banjo bolts.
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Originally Posted by hellosailor View Post
I don't know that engine or system, but if there are very thin copper washers, that look like copper "foil" ?

Those would be common "crush washers" which literally ARE copper foil. They are intended to distrot and conform to the shape of the joint they are sealing, and most folks are unaware that they are strictly "use once and replace" parts. REPLACEMENT IS MANDATORY. They will plague you with fuel or air leaks if you try to re-use them, so if your system does use them, order a box of a DOZEN so you have no incentive to re-use them. In many systems you would bleed air from the lines at these some points--and the process of loosening the line and then tightening it (bleeding) actually requires replacing the damned crush washer, or it will leak.

This is one reason why some of us will share quarters with a diesel engine, but we'll never love it.
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a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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Old 04-12-2010
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Thanks to all that have responded. I talked to a Kubota guy and he told me that the injection line is a compression fitting and usually needs to be replaced if it leaks.
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