Originally posted by sandiegan urban legend says to stay away from those last 3 gallons at the bottom of the tank...
And it's about as reliable as most other urban legends. Your fuel pump is at the bottom of the tank, otherwise you wouldn't be able to use all the fuel. So your car is ALWAYS using the bottom gallon of fuel. If there is some contaminant floating at the top of your gas, then there might be something to that advice, but even then, your fuel is sloshing around as you drive so I still can't imagine there being that much difference in what the pump picks up on full vs. empty.
Originally posted by crashandburn The yellow light is controlled by a separate thermistor in the fuel tank. When the thermistor is surrounded by fuel, it stays cool and has high resistance so the light stays off. When the fuel level drops below the thermistor, the device warms up and it's resistance decreases. This allows enough current to flow through the light for it to illuminate.
I think your worng, It is controlled by the gage, cause my gas gage is broken and never moves, and i ran out of gas one time completly. The light never came on. The Low fuel light is controlled by the gage.
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And it's about as reliable as most other urban legends. Your fuel pump is at the bottom of the tank, otherwise you wouldn't be able to use all the fuel. So your car is ALWAYS using the bottom gallon of fuel. If there is some contaminant floating at the top of your gas, then there might be something to that advice, but even then, your fuel is sloshing around as you drive so I still can't imagine there being that much difference in what the pump picks up on full vs. empty.
from what i heard it's the contaminant that makes it not good to use the last few gallon of gas, but not sure how true that is.
one time i've got about 410 miles a tank, all highway, from buffalo to jersey. i wanted to see what's the most i could get out of a full tank, so i didn't vtec, cruised the whole way @ around 70~75 mph and only rested once. i was so impressed because i didn't have to stop some where and get gas in the middle of the trip. but normally i get about 300 miles a tank, that's from the full tank to when the light comes on.
I think your worng, It is controlled by the gage, cause my gas gage is broken and never moves, and i ran out of gas one time completly. The light never came on. The Low fuel light is controlled by the gage.
What I posted about the thermistor isn't my opinion -- it's how the system works. I've read the Helms Service Manual as well as the Helms Electrical Troubleshooting Manual that gives the diagrams for every circuit in the 5th gen Prelude. The Low Fuel Sensor and the Fuel Gauge Sender are located in the same housing and maybe that's why both went out on your car. But the low fuel light is NOT controlled by the fuel gauge. See Helm's Service Manual p. 23-62 and Helm's Electrical Troubleshooting Manual p. 74.
EDIT: MrManz1691, have you done anything to your gauge cluster that made the fuel gauge quit working? Because if you haven't, you may just have a loose connection at the fuel tank unit (where both senders are located). The fuel light and the fuel gauge have separate senders, but the two sender wires follow almost the same path to the gauge cluster.
Last edited by crashandburn; 08-07-2003 at 12:11 PM.
What I posted about the thermistor isn't my opinion -- it's how the system works. I've read the Helms Service Manual as well as the Helms Electrical Troubleshooting Manual that gives the diagrams for every circuit in the 5th gen Prelude. The Low Fuel Sensor and the Fuel Gauge Sender are located in the same housing and maybe that's why both went out on your car. But the low fuel light is NOT controlled by the fuel gauge. See Helm's Service Manual p. 23-62 and Helm's Electrical Troubleshooting Manual p. 74.
EDIT: MrManz1691, have you done anything to your gauge cluster that made the fuel gauge quit working? Because if you haven't, you may just have a loose connection at the fuel tank unit (where both senders are located). The fuel light and the fuel gauge have separate senders, but the two sender wires follow almost the same path to the gauge cluster.
where do I get pictures and details about how to check this or find the fuel sender?
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good call 
that's why it's an urban legend 
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