Sounds confusing doesn't it!
'02 Yukon XL 1500
5.3L Vortec FF engine (Using E-85 75% of the time)
103,000 miles
If the gas gauge reads less than 1/4 tank, and you let the truck sit for over 6 hours (overnight) it cranks, but doesn't start. You hear the fuel pump run as normal.
If you add fuel to bring the gauge to 1/4 tank, truck will start right up.
You can drive the truck right through the "low fuel" light right down to "E", including stopping for a dinner-and-a-movie (about 3hrs.) while on "E" without a problem.
Next morning, will not start. Add fuel to bring to 1/8 tank, still nothing. Add more fuel to bring to 1/4 tank, starts right up and good for the day!
Replaced fuel filter and had pump volume/pressure tested at 1/8 tank, all was well.
Any ideas??
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