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Old 31-08-2017, 07:42   #1
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4-108 lift pump

Has anyone ever had a problem with the rod that drives the lift pump sticking in the up position?
That's what I have and it seems to be why there is a regular flow of fuel into the oil pan.
Does that make sense to anyone?
Injectors and pump rebuilt, lift pump new and yet flow of fuel continues into the pan. Cant find any other source of fuel.

Bob
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Old 31-08-2017, 08:26   #2
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Re: 4-108 lift pump

That little pushrod should be pushed back down by the spring in the pump. You found that with the pump removed, the pushrod is stuck in the up position and you are sure the cam lobe is down?
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Old 31-08-2017, 09:06   #3
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Re: 4-108 lift pump

I bypassed pump and installed electric lift pump near primary filter, works of ignition and makes filter change and bleeding really easy now.
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Old 01-09-2017, 06:20   #4
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Re: 4-108 lift pump

Diesel fuel can enter your engine from the fuel lift pump if the diaphragm is damaged in any way-and by the sound of your description you need a new pump or as some do change over to a 12 volt pump hooked to the ignition,

(makes bleeding a lot easier)

Cheers Steve
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Old 01-09-2017, 06:37   #5
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Re: 4-108 lift pump

One further point as I note you say the lift pump is new?

The only other way fuel can get into the sump in any quantity is the Injector pumps seals (Did they specifically get changed or the pump just pressure checked/timed) worth asking the re-builder!(Most Likely after lift pump issue)

Last item would be one or more of your injectors badly leaking (no likely)you should notice the running condition/smoking of engine

Cheers Steve
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Old 02-09-2017, 18:44   #6
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Re: 4-108 lift pump

If the front seal on the injector pump is leaking, it will put fuel in the pan via the gear drive. Sometimes the shaft will get worn or pitted and either fail to seal or ruin a new seal.
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