Injection Pump Leak- pump Top Half Removal?

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C854runner

New member
Have a leak under the vehicle after a recent cold start, ran it for 30 seconds to pull into garage and as always when walking inside I looked back for leaks. Saw what ended up being diesel dripping to the floor. Sprayed brake clean all over injection pump then restarted the 300tdi and it looks like the leak is between the top cap of the pump and the main pump housing itself as I didn’t see anything higher up from other angles. Is that rectangle seal something that can be replaced while pump is in the vehicle or do I need to pull the whole pump? It seems like removing the throttle linkage would allow access to top cap bolts heads but was wondering what other than the governor spring requires care when removing the top half?
 

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C

C854runner

New member
@uc4me
Thank you, looks like a good time to address multiple seals once it is out.

Have seals on the way but still wonder what led to the leak as there was not even a seep prior. I hadn’t run any additive with the ULSD in the last 4-5 tanks. Wondering if the cleaner fuel without my normal additives (diesel kleen) possibly led to o-ring degradation over the last few months.
 
javelinadave

javelinadave

Administrator
Staff member
C854runner said:
@uc4me
Thank you, looks like a good time to address multiple seals once it is out.

Have seals on the way but still wonder what led to the leak as there was not even a seep prior. I hadn’t run any additive with the ULSD in the last 4-5 tanks. Wondering if the cleaner fuel without my normal additives (diesel kleen) possibly led to o-ring degradation over the last few months.
Click to expand...
Age, heat and additives are will cause seals to fail over time. Factor in cold temps that shrink O rings and things start to leak. If you search "My clutch master is leaking," 9/10 times the post was made in the fall or early winter.
 
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michael67

Well-known member
I wrote up a how-to on defendersource when I fixed mine in 2012 using the dieselgeek seal ("300 Tdi & dieselgeek.com"). Relatively easy job. If I remember, the biggest PITA was removing the shutoff solenoid. Still no leaks after more than 12 years.

Never mind, I read your post too quickly - you're not talking about the head seal.
 
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