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U lost prime in fuel delivery. Once it happns it takes long time to normalize. Car is 15yr n needs inspection of the system. Bring to independent shop that has xperience. Search surecritic.com
the fuel level sender is inside the fuel tank, part of the fuel pump assembly. did you or was the tank replaced before??they may have bent the float arm on reassembly . you can buy the sender from your parts supply store .you will have to drop the tank to do this it clips onto the side of the pump assembly. run it almost dry first as the tank is big n very heavy even 1/4 full. you can try to bend the old arm
but its very hard on the "sender" as for level indicator full to empty, think of the shape of the tank narrow at top to widest point in the middle (full to half) wide middle to narrow bottom( half to empty)
Sorry, but fuel pump and fuel gauge sending unit are all one unit, and in the tank.! There should be 2 straps that come off, drop the tank(preferably empty) and it's out.
NOTE* disconnect all fuel lines first and disconnect battery is a safe bet too.
fuel tank vent could be blocked by mud/pebbles etc, not letting the gas fumes escape while your adding fuel making it overflow, check underneath the car near the fuel tank .. something to start with..
Check the vent on the filler tubes for bent or blocked areas. As fuel goes in air must go out. New fuel tank for $900! ouch! It is not likely the tank. But ......if the vents are OK and it is a defect in the tank ..... put a mint used one in.
If the fuel gauge drops off when you are driving then its a sending unit problem that means you have to drop the tank and replace the float and sending unit. This is a common problem for alot of cars because of cheap gas. If you have to drop the tank check the fuel pump canster for dirt because of cheap gas. Replace the fuel pump strainer and fuel pump filter. If the car or truck has about 100,000 miles you might want to change the fuel pump at that time also just to cover your back. If you take it to a shop they will charge you at least $900 to start. But if you do it yourself it will cost you about $200 dollars maybe alittle more.
Sending unit is in gas tank. usually as an assembly with the electric pump. These aren't cheap either, If you know a mechanic you can trust ask him how much to install a new one, I can get them wholesale for less than two hundred dollars, but of course retail probably more like 250.00 Hope this helps you!
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