Fuel Sending Unit
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Disclaimer: This photo is sourced from many relied on internet sites, photo copyright depends on the proprietor of the photo, we do not acknowledge this picture as our residential property or work.The magnetic field of the low coil attracts the magnet on the needle and moves the needle to the low position. When the sending unit has low resistance, most of the current flows through the high coil and the sending unit.Under this condition, the magnetic field of the high coil attracts the pointer magnet so the pointer moves to the high position. In some balancing coil fuel gauges, voltage is supplied to the low or empty coil and the sending unit is connected between the empty coil and Most medium and heavyduty commercial truck fuel subsystems use remote (from the tank) fuel transfer pumps rather than assemblies that incorporate the sending unit and a transfer pump. Therefore, the fuel sending unit is an integral assembly flange fitted.to the tank. It consists of a float and arm connected to a variable resistor whose function it is to control current flow to a cab gauge proportionally with fuel tank level. Most older dual fuel tank truck chassis in which the tanks were Apply a strip of selfadhesive tape across the bottom of the fuel tank where it is positioned on top of the fuel tank crossmember, and apply another strip to the top of the rear crossmember. Apply a strip of selfadhesive tape around the inside of each fuel tank strap. A roll of 1 inchwide weather stripping costs a few dollars and is available at most hardware stores. Sending Units Always install a new sending unit in a new fuel tank. The sending unit is attached to the right underside of the Sending.Unit — Another component of the fuel tank is the sending unit. It's responsible for providing your fuel gauge with feedback as to the amount of gasoline in the tank. And a wiremesh screen incorporated into the sender also filters contaminants out of the fuel. The sending unit is secured to the tank with a large steel locking ring. This ring has a camlike action that tightens down on the sendingunit flange as it is tapped into place. If the sending unit needs to be replaced, it can be Lately your fuel gauge is about as reliable as a politician's promises. When you ran out of gas, the gauge showed a quartertank of fuel remaining. The car has the type of fuel system shown in the drawing below. Your first troubleshooting.step is to check the electrical terminals at the fuel sender unit. They look okay: Both connections are clean and tight. Perhaps a bad ground connection? No, the ground connection is clean and tight. Is voltage available at the fuel sending unit? To find Clean the pump and sending unit mounting area in the fuel tank with a shop towel, and install a new gasket or Oring on the pump and sending unit. On some tanks, the gauge sending unit and fuel pump are mounted separately (Figure 75). 9. Install the fuel pump and gauge sending unit assembly in the fuel tank, and secure this assembly in the tank using the vehicle manufacturer's recommended procedure. Some vehicles have a separate fuel pump and gauge sending unit.In instances.where the fuel transfer pump is located outside of the fuel tank, a standalone sending unit is required. This is usually flangefitted to the top of a fuel tank. The function of a sending unit is to signal the fuel level to the chassis data bus, and from there to a dashlocated gauge. A sending unit usually consists of a float and arm connected to a variable resistor. The float is suspended by whatever amount of fuel is in the tank. It moves a wiper over a variable resistor. The position INSTRUMENTS CIRCUIT KNOWN INFO POSSIBLE PROBLEMS KNOWN INFO POSSIBLE PROBLEMS KNOWN INFO POSSIBLE PROBLEMS DIAGNOSTIC FLOWCHART DISCONNECT WIRE 28A AT THE FUEL SENDING UNIT HARNESS. IS THERE CONTINUITY BETWEEN THE ENDS OF WIRE 28A AT THE FUEL GAGE.AND AT THE FUEL SENDING UNIT HARNESS? 1.STE/ICER TEST 91 (PAGE 2426) 2. MULTIMETER REASON FOR QUESTION If the wire is ok then the Fuel pickup tubes seldom fail, but when they do it is usually by metal fatigue cracking at the neck. This results in no fuel being drawn out of the tank by the transfer pump whenever the fuel level is below the location of the crack. Fuel Tank Sending Units Most commercial truck fuel subsystems use fuel transfer pumps located outside of the fuel tank. This means that they use a standalone sending unit usually flangefitted to the top of a fuel tank. The function of a sending unit is to signal CHAPTER SEVEN resistance of approximately 1120 ohm (depending on the level of fuel in the tank) signifies the.fault lies in the wiring or connectors. An indication of approximately 1 00 1 20 ohms is for an empty tank. Fuel Gauge Unit Removal/Installation The fuel gauge unit is housed in the instrument cluster. To replace the gauge unit, remove and disassemble the applicable instrument cluster as described in this chapter. Fuel Tank Sending Unit Removal/Installation 1. Refer to
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