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According to my owners manual I should have a 34.5 gallon tank (2018 F350 crew cab 6.2 short bed). Today I was down to a little below the 1/4 mark and filled up and it took 22 gallons. How can my last 1/4 tank hold 12.5 gallons? Anyone else notice their gauge off?
I wonder if the neck foamed back and kicked off the pump? I have a 2020 and heard ford keeps a reserve but I doubt its that much. Saturday I swapped out my 34 gal for an S&B 60 gallon. DTE told me I had 24 miles left. I pumped 3 gallons out of the OEM 34 tank. Put 5 gallons in the new 60 gallon then filled at the pump. It took 52,27 + my 5 for a total of 57.27.
It's a subject that's been covered a bunch. Some guys do something about it and some don't. I don't because I figured that the fuel surplus left in the tank helps protect the fuel pump by keeping it immersed in fuel.
The OM also includes discussion about a fuel tank reserve; see below. The translation IMHO is there’s still some fuel left in the tank when the gauge indicates it’s empty. The remaining fuel appears to be several gallons.
Our 2019 34 gallon tank’s useable capacity is about 30-31 gallons until the fuel gauge reads empty and the DTE display reads something close to zero. So, yeah, it only takes ~22 gallons to fill it when the gauge reads 1/4.
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