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Old 07-27-2018, 07:13 AM   #1
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Lehman diesel leak help

The third injector from the rear of my mimec fuel injector pump started leaking recently. The nut is tight. The fuel is coming from the base of the inlet which is marked with a white dot from when Midwest fuel injection rebuilt it. I take it one is not supposed to fool around with it.

Has anyone else had a leak there and how did you resolve it. Thank you

The second leak is in the fuel pump, I can address that one. The PO put silicone on the leak!


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Old 07-27-2018, 07:28 AM   #2
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Try this sticky in Power Systems for help.....

Minnimec Delivery Valve Seal Leak - Lehman 120hp

A slight ooze when under pressure after a recent start or when running does not seem to alter performance.

But it does affect leakback to low fuel system spots and may reqire bleeding before some starts if not started in a long time.
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Old 07-27-2018, 08:37 AM   #3
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Wow perfect reply. Thank you. Just had the pump rebuilt 300 hours age, $2500. Hope I can still get the wrench and parts.
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Old 07-27-2018, 09:06 AM   #4
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If I only had 300 hours on the pump, I would be asking the rebuilder to tighten it up or replace/repair what they didn't.
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Old 07-27-2018, 09:10 AM   #5
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I would as well except for having to remove the pump and driving it 3 hours , waiting 2 weeks and then reversing the process. Ugg.
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Old 07-27-2018, 10:25 AM   #6
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Those fuel pumps are cheap and ‘probably’ it needs a new gasket anyway, they leak oil relentlessly.
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