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Discussion Starter · #1 · (Edited)
Below are some pics of a disassembled fuel pump, most notably the screen at the suction end. It is worth noting that this stuff was largely "stuck on" pretty good. Meaning it did not just come off spraying it with carb cleaner and such. I had to scrape the screen, both sides and spray/scrape more multiple times to get it cleaned off. Also worthy to note is that in the space behind the screen there was a bunch more gunk "floating around". Not stuck to the screen, but in a position to get sucked against it and plug the spots that were flowing a little. I took the opportunity to blow into the fuel line back into the tank and perhaps clear some things from that screen/pickup also. It seemed pretty clear though

And yes.. this same fuel pump is back in operations on my truck and my fuel starvation issues appear to be alleviated (for now - till the next time I need to do this from running all kinds of "crazy fuel". (last time I did this was several years ago.).

I think is is to be expected that if you run biodiesel and W85 and/or whatever for years with sometimes questionable/substandard filtration, that if you are having fuel starvation issues, that this might be the cause. Might show up in cold (but not fuel gelling) temps also.

Also tells me that I should have a fuel pressure gauge to head this type of thing off before it causes issues on the road.

This job is not that hard (but not that easy either, you have to be careful about taking it apart and putting it back together right)
 

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That's a lot of crud but I doubt any of it came from your fuel, more likely the fuel cleaned it from the tank.
 

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good post there on the fuel pump inlet. I just started running W85 in my 99 power stroke.

This coming week, since I am older than dirt and don't punch the clock anymore, I think it is best that i slide under that beast that has served me so faithfully since new and look into the fuel pump screen issue. Saturday we hit the road for an 8 hour haul.
 

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Discussion Starter · #4 ·
good post there on the fuel pump inlet. I just started running W85 in my 99 power stroke.

This coming week, since I am older than dirt and don't punch the clock anymore, I think it is best that i slide under that beast that has served me so faithfully since new and look into the fuel pump screen issue. Saturday we hit the road for an 8 hour haul.
I would certainly be curious to hear/see what you find and what your prior "funny fuel" practices have been. I am with RSR in that I do not think that the "fuels" I have been experimenting with/running "caused" this. Rather, I think (know) I have (sometimes - not always) done a poor job of filtering (or not) biodiesel that went in to my tank, and I also think this was slow buildup, over several years. A little thicker W85 and a road trip "may" have made it more noticeable. And "maybe" the road trip got the fuel in the tank hotter from recirculating and made this stuff "stickier"/more restrictive?. I never noticed any fuel restriction popping up till about 500 miles into my trip.
 

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what issues were you haveing ?
what was the truck doing ???
im haveing some issues myself
i think i lost an injestor

david
 

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I know this is an old post, but I made a video about what's inside these fuel pumps. Mine was a 99 f250 with 7.3 450k miles. The pump didn't fail. I replaced it because I was having strange problems. Turned out to mostly be due to the plastic POS fuel pickup and clogged fuel mixer in the tank. Anyway, here is a link to the video. I'm trying to get my subscriber count over 1000 so I can monetize my videos, so please subscribe. Thanks
 
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