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undo all the fuel lines and vacuum lines, electrical connectors to the fuel tank. undo the fuel filler tube at the tank. support the gas tank as it will be heavy depending on how gas is in it. undo the fuel tank straps and lower the tank. clean the area around the sending unit of dirt and remove the lock ring that holds the sending unit into the tank then you can remove the sending unit to replace the pump. follow the instructions that came with the new pump. don`t use a used pump and change the fuel filter.
Hey Jim,I see that it is showing 2 types at auto part stores.You can see the return line on the one with it,the way to find out is when you change you will see.Not good to buy in advance,may have to order.
Usually a pump with a return will have a separate connection to go from the pump back to the cell. If yours has that connection ,I would put the return line back to the cell on it. A return line is nothing more than excess fuel being returned to the cell.
the tank will have to be dropped to gain access to the pump as it sits in the top of the tank.support the tank,disconnect the fuel lines and vacume lines and any elctrical that you can get to.undo tank straps and lower tank disconnect the connector for the tank sending unit and any other vacume lines,remove tank from car and clean dirt from around the sending unit.remove lock ring that locks the unit to the tank and seals the unit.remove the sending unit from the tank.the pump is at the bottom of the unit,remove and replace the pump as it looks and reassemble and re-install in reverse order.don`t smoke around the car while doing the work.
The fuel pump is inside the fuel tank. To replace it you must remove the fuel lines, fill and vent hoses, and the electrical connector at the fuel tank. Then the two straps holding the tank in place must be released and the tank will come down. A lock ring holds the sending unit and fuel pump in place and must be removed by sliding it counterclockwise, then the sending unit and pump will come out as an assembly. Often the sending unit lines are too corroded to be reused, or are too corroded to release the fuel lines. In that case I cut the steel lines at the sending unit with side cutters, which allows me to take the lines down and position them where I can pick the rust out from the connector sockets and, eventually unlock the fuel lines. The sending unit must be replaced; and I just order complete assemblies ready to drop into the tank. You'll also want to replace the o-rings on the fuel lines.
This task is not so easy for a do it yourselfer. This car must be raised on a hoist, then wiring,fuel lines have to be disconnected, and fuel in the tank must be drained or recovered. . Then the tank straps have to be removed. With the tank supported it can now be removed.
Don`t try this at home !!! Take vehicle to a repair shop- labour to remove and reinstall should be about $200 - without parts or further repairs-example fuel lines..
Using the J 45722 or equivalent, remove the sending unit lock ring.
Remove the sending unit and seal.
Discard the seal. CAUTION Drain the fuel from the fuel sender assembly into an approved container in order to reduce the risk of fire and personal injury. Never store the fuel in an open container.
Clean sealing surfaces.
CAUTION In order to reduce the risk of fire and personal injury that may result from a fuel leak, always replace the fuel sender gasket when reinstalling the fuel sender assembly.
Install a NEW seal. CAUTION The fuel pump strainer must be in a horizontal position when the sending unit is installed in the tank. When installing the sending unit, assure that the fuel pump strainer does not block full travel of the float arm.
Install the sending unit into the fuel tank.
Using J 45722 or equivalent, install the sending unit lock ring.
No access pannel you have to remove the tank. To do this job right relace teh entire fuel pum/sending unit and the electrical has to it some times the new unit comes with the wire harness also spen the extra 15$ and replace the fuel filter or it will burn out teh pump again.
You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.
On a C900, the fuel sender level unit is separate from the fuel pump
and located on the right side top of the tank, accessible by removing
the trunk floor lift up panel (the pump is located on the left side top
of the tank. Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.
the resistance of the sending unit with the lines disconnected, the resistance should be
2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for
voltage across the top of the sender unit, if no voltage, that's likely
If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.