OK.. so my mother in law mistakenly pumped 20 gallons of unleaded in the cummins.. Then she drove it a little under a mile and said it was bucking and shaking pretty good. She shut it down and I went to get the truck. I siphoned out the gas and filled it with diesel and a little 2 cycle oil and a bottle of additive. Then i opened the water drain on the fuel filter into a pan and primed the pump a few times. I changed the fuel filter but when i was putting the pan contents into a jug I noticed that there was small metal shavings in the contents. About the size of a pencil dot on paper. Im thinking that they are from my fuel pump because ive heard the pump is cooled and lubed by the fuel. I know gas has NO lubricative properties so am i looking at needing a new fuel pump soon? If its not most likely from the pump then where could they have come from?

 

You let your Mother-in-Law drive your truck???

 

More than likely they are from lack of clean up on assembly, or, possibly the lift pump. You won't see shavings from the IP in the filter as the return goes to the tank not the filter.

Get a fuel pressure gauge and monitor the pressure at the IP to see if the LP is going bad. With that small of driving time its a good chance there is no damage to IP but the only way to tell is tear it down. If there was still diesel in the tank when the gas was added you still had some lube. If your lucky no long term damage was done.

 

My mother-in-law asked to drive my truck once, I laughed then threw a peanut at her...

But seriously, it still had 10 or so gallons of diesel in there, you did everything right from there. I dont see where the shavings could come from. the only thing between the filter-drain and the tank is your in-tank pickup and some fuel lines.

 

Thats pretty low, Blaming it on your Mother-In-law... you must be hoping she never finds this site???? JK...
Sounds like you did everything right, I might would have put some ATF in it too, for some reason, cheap ATF is good at neutralizing unleaded. The metal shavings might have came from the gas station pump, bottom of your fuel tank, or lift pump... Its just that since you had a problem, you might be paying closer attention that if this was a normal PM filter change...
My brother-n-law called me late one night leaving Kentucky headed back to Texas and had ust put 8-10 gallons of unleaded in his PSD. I told him to just buy 5-6 quts of ATF, pour it in, then finish filling up with diesel, then get back on the highway and burn it out.... That was a year ago and no ill effects from it.
I still can't believe you are blaming it on your Mother-n-law though!!!!

 

mother in law or not, its amazing someone borrowed a truck and was actually putting fuel in it. just clean the bowl out real good and keep an eye on ur fuel pressure

 

Amen to that... I ususally have to go collect things I let somebody borrow... And more times than not, I have to work on it when I get it back home.

 

my truck made it 60 miles on a 4gal Diesel to 30gal unleaded mishap with no ill effects. After draining the tank, added some diesel additive, filled'er up properly, poped the water drain, primed twice, shut the drain, primed twice. Everything's kosher 1k later.