water in diesel question

VortecJeep

VortecJeep

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Joined
Aug 24, 2005
Location
Concord, NC
2017 F250 6.7
175,000 miles
earlier this summer the water in fuel light came on. I drained the separator and replaced both fuel filters.

Yesterday the light came on again. I drained it this morning.

My questions: do you think I just have a quantity of water in the main tank and both of these times are from that and eventually I’ll get it all drained? Anything I should check? Any treatment I can pour into the tank?

i’ve had a diesel truck since 2010 and this summer is the first time I’ve ever had to deal with this.

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Is the tank easy to drain? If so, I'd probably drain a sample out and see how that looks.
 
Reconsider where you're getting fuel. The water is heavier and generally sinks to the bottom (some will dissolve/mix with the fuel and can cause vapor lock issues). The pickup grabs whatever is at the bottom of the tank first, which should be most of the water.
 
Am I correct in assuming there is one pump to take it from the main tank to the separator, then another pump from the separator to the engine?
 
shawn said:
Reconsider where you're getting fuel.
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This...
Since 99% of "auto diesel" pumps are still sporting filters from 2022... so these sources are "dire emergency ONLY"
I buy fuel where the (local) truckers purchase theirs... given the volume, the vendors can ill afford to push dirty fuel and suffer the instant boycott/bad mouthing, so they're typically on top of sampling, filters, etc.
 
VortecJeep said:
Am I correct in assuming there is one pump to take it from the main tank to the separator, then another pump from the separator to the engine?
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Unless they've changed something with the 6.7L's, PowerStrokes typically have a frame mounted "lift" pump that pulls from tank, thru frame mounted filter/water separator, and to the secondary filter on the block at injection pump source
 
I would drop the tank and turn it upside down and get everything out of it, A fuel system will cost much more then a Saturday morning.
 
BIGWOODY said:
I'd drain the tank if it continues to happen, injectors aren't cheap.
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It wouldn't get to the injectors. The CP4 would suffer a rapid unscheduled disassembly....THAT would take out the injectors and everything else. :D


For sure get fuel from a better source. I've never had that much water drain from any of my diesel trucks combined. It had to have been pumped in there.

I'd be running a good fuel additive anyway. OptiLube or HotShots...something.
 
I don’t know which of the 10 different stations I’ve gotten fuel from this summer may be the issue. I’d guess it’s one from when I was out of town, as when I’m at home I fill up at one of two different stations.
 
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