Quote:
Originally Posted by Sugar Bear
A clogged vent will get worse as the fuel level decreases due to suction. A clogged strainer will get worse as the level lowers due to weight of the fuel column lessening as the volume decreases and the strainer are a few inches tall and clog from the bottom up so the top is less clogged.
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I remember now that I inspected the sending unit a while back and drove the truck with the unit removed to test the suction issue. No change in the problem and the fuel level unit works correctly.
The strainer is interesting since it's a few inches tall, but the problem starts at the 2/3 level or so which I would think is well above the strainer. I think the weight of the fuel may play a role in why it does it with less fuel, either by helping it get through the strainer or helping the lift pump work better.
I'm getting ready to tear the whole truck apart and do a "refresh" on the chassis and drive train. I wanted to figure out the fuel issue first but I may just pull it all apart and see if I can find anything then. If I have to fix it after I put it back together, oh well.