Weird thumping, and leaky lift pump? - Ford Powerstroke Diesel Forum
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Old 02-28-2014, 03:12 PM
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Weird thumping, and leaky lift pump?

Hey all, I've got a strange thump coming from underneath my rig. It sounds like it's coming from the center or right side, and it happens every few minutes all the time. Idling in park, driving around, cruising on the freeway, it just keeps doing it. I can't find anything under there that could be causing the noise though, so I'm kind of stumped!

Also, while I was under there I noticed that the fuel pump in the frame rail on the drivers side (I'm assuming it's a lift pump, I've only ever had IDI diesels) is kind of wet all over. Is this a known problem?

Thanks!
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Old 03-05-2014, 08:46 AM
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Crickets? Really?? Damn this section is dead. I've discovered that the thumping must be related to the HVAC system somehow, because it only seems to happen when the windshield defrost is on. Nothing beyond that yet
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Old 03-05-2014, 09:25 AM
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blender door. try driving down the road for a few miles with the air completely off.

do a search for blender door, you'll find tons of threads on it. Common problem with the 6.4's. Mine does it, my dads 08 does it. i guess i'm just used to it now.
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Old 03-05-2014, 10:27 AM
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Yup just the compressor I believe. I'm pretty sure it does it even brand new. I don't use my deforest a lot but when I do I always here it. Nothing to worry about. As for the lift pump sounds like the cap might not have a good seal or those covers and drain levers do and can leak.
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Old 03-09-2014, 08:42 PM
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Thanks guys! I did some googleing on the blend door issues. What a pain in the ***!!! Ford should've figured this out eons ago. If I replace the actuator, does that constitute a permanent fix or does this happen again and again? I guess I could get used to it but it's so damned annoying, scared the crap out of me when it first started happening. I thought there was something seriously wrong with my truck, went up and down the frame and body on that side of the truck looking for anything that could thump and came up dry. I'm planning on doing the fuel filters soon so I'll get under there and make sure everything is nice and tight before I crawl back out from under it. If it still leaks then should I replace it or just live with it?
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