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failure rate
Posted by Monster (more from Monster) on Sat, 7 Oct 2000 08:13:32
In Reply to: More pictures..., Ryan Goldade, Fri, 6 Oct 2000 16:46:00
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My experience (one Saab) is that the failure rate for the later variant of the sender is a sinking float after about 10 years, then the thing read 1/8 tank low for 3 years before I replaced it. No damage to those recording wires from side shock or torsion. I don't really see how side shock could be transmitted to them since the float rides on that central pole and doesn't push sideways on the wires. Torsion loads would be pretty minimal (the car would have to be suddenly jerked into a very fast spin) because of the low mass of the float. Also, there is damping from the gasoline inside the cylinder, and the innards are protected from violent sloshing in the tank by the small gas bleed ports in the cylinder. Still, those thin vertical recording wires seem somewhat fragile and exposed, and I've heard of them failing from other owners.
The newest thing (last 10 years or so) in experimental aircraft is a capacitance probe that hangs down into the fuel cell. No moving parts, and its output goes to a circuit which can be calibrated for odd-shaped tanks, thus can be made accurate (gallons remaining) through its entire range from full to empty. I wonder if any automakers have used this technology?
Thanks for posting the pics, Ryan. I'm sure a lot of people are getting a good education from this!
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