Just got a new fuel tank sending unit for the C10. I tested the gauge by unplugging the wire from the sending unit and the needle goes to empty, then grounding that wire, the gauge pegs full. So think that suggests that the gauge is fine.
When I put the new sending unit in, and put some gas in, the needle rose appropriately. Next time I drove it, today, I noticed that on start up, the needle was at 1/4 tank (it had been at 3/4 full when I parked it 2 days prior). No gas smell etc so I don't think i leaked. Wiggling the wire on the sending unit, did nothing. A minute or two later the needle just rose back up to near 3/4. So it read low for 1-2 minutes, then read accurately after that. Driving it around it did that same thing every other time I parked it and started up again.
That sounds weird right? Not a big deal but can anyone explain why it might do that?
When I put the new sending unit in, and put some gas in, the needle rose appropriately. Next time I drove it, today, I noticed that on start up, the needle was at 1/4 tank (it had been at 3/4 full when I parked it 2 days prior). No gas smell etc so I don't think i leaked. Wiggling the wire on the sending unit, did nothing. A minute or two later the needle just rose back up to near 3/4. So it read low for 1-2 minutes, then read accurately after that. Driving it around it did that same thing every other time I parked it and started up again.
That sounds weird right? Not a big deal but can anyone explain why it might do that?