O2 Sensor/Fuel Sending Unit/Gas
#1
Member
Thread Starter
Join Date: Jun 2003
Location: Albany, NY
Posts: 43
Likes: 0
Received 0 Likes
on
0 Posts
O2 Sensor/Fuel Sending Unit/Gas
I had to have my "fuel sending unit" replaced last October. I would fill up my tank and the very next day I would be at the mid pt as far as the gas gauge goes...so the dealer replaced that and the fuel reading was no longer erratic.
My question is whether the Fuel Sending Unit is the same thing as the O2 sensor? I heard replacing your O2 sensor can improve gas mileage by up to 15%...any one know about either of these 2 things...or it if they are the same thing...
My question is whether the Fuel Sending Unit is the same thing as the O2 sensor? I heard replacing your O2 sensor can improve gas mileage by up to 15%...any one know about either of these 2 things...or it if they are the same thing...
#2
Registered User
Join Date: Jun 2003
Location: Bay Area, CA
Posts: 78
Likes: 0
Received 0 Likes
on
0 Posts
The fuel sending unit looks like this and is located inside in the gas tank.
It uses a float that moves down as the gasoline in the tank goes down. It converts the travel of the float into electrical voltage, and is sent to a special metal spring that's attached to the fuel gauge. This metal spring is sensitive to varying voltage, and is how it moves the needle. Fuel sending units become inaccurate because they develop excessive resistance in the circuitry, which to the gauge reads as lower fuel level.
I'm not sure exactly how an O2 sensor works, but I do know it's used to provide feedback to the ECU as to how the emissions of the engine are. On OBD-I vehicles, there is an O2 sensor mounted on the exhaust downpipe. OBD-II vehicles also have a second O2 sensor mounted in the catalytic converter to measure the efficiency of the cat. A common problem that causes the "check engine" light to come on is a faulty O2 sensor, as to whether replacing it will improve gas mileage, it couldn't hurt
It uses a float that moves down as the gasoline in the tank goes down. It converts the travel of the float into electrical voltage, and is sent to a special metal spring that's attached to the fuel gauge. This metal spring is sensitive to varying voltage, and is how it moves the needle. Fuel sending units become inaccurate because they develop excessive resistance in the circuitry, which to the gauge reads as lower fuel level.
I'm not sure exactly how an O2 sensor works, but I do know it's used to provide feedback to the ECU as to how the emissions of the engine are. On OBD-I vehicles, there is an O2 sensor mounted on the exhaust downpipe. OBD-II vehicles also have a second O2 sensor mounted in the catalytic converter to measure the efficiency of the cat. A common problem that causes the "check engine" light to come on is a faulty O2 sensor, as to whether replacing it will improve gas mileage, it couldn't hurt
#3
Dr. Klaw
Join Date: Apr 2003
Location: Ft. Walton Beach, FL
Posts: 288
Likes: 0
Received 0 Likes
on
0 Posts
WOW. I have the same fuel problem in my 93 accord and I thought I would just have to live with it. I can fill it up and at 50 miles its at half a tank. But it stays there till about 160 then works fine the rest of the way down.
#4
Registered User
Join Date: Jun 2003
Location: Bay Area, CA
Posts: 78
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by hype8912
WOW. I have the same fuel problem in my 93 accord and I thought I would just have to live with it. I can fill it up and at 50 miles its at half a tank. But it stays there till about 160 then works fine the rest of the way down.
WOW. I have the same fuel problem in my 93 accord and I thought I would just have to live with it. I can fill it up and at 50 miles its at half a tank. But it stays there till about 160 then works fine the rest of the way down.
#5
Originally posted by VTECnKEN
... Also, I sanded down the ground point located in the trunk just in case it was causing some un-needed resistance.
... Also, I sanded down the ground point located in the trunk just in case it was causing some un-needed resistance.