Fuel pump will run out of the gas tank, but when put back into the tank it will not run. The float broke off. The fuel gage inside of the car says full when the pump is out of the tank and the gage says empty when place back in the tank.
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Re: Fuel pump will not stay on.
You mean the pump works when you plug in 12v (+)and ground (-) straight from battery, right?
Check your ground wiring at the fuel tank. I beleived there is collar or something similar that provides ground. If you can't find it, try a jumper wire from the chassis to the (-) of the fuel pump. I had a couple of cases like this before.
Regarding the fuel level sending unit, check your auto parts store, they sell it separate for some models. Or, you can get one at the Junk Yard, I would not get a fuel pump there, but I would get the sending unit.
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Fuel injectors require a high pressure fuel pump which is located in the gas tank. The gas serves as the lubricant for the pump, so wen you ran out and emptied the tank completely you no longer had lubricant and the pump burn out. It won't pump gas now because it's the fuel pump is burned out and needs replacing. It runs when you put fuel in the injectors as that bypasses the pump. Replace the pump and the never let the tank get below 1/8th full (half a 1/4 of a tank).Not lie the old low pressure fuel pumps on the side of the engine blocks. Not cheap to buy a fuel pump and have to drop the tank to replace the burned out one. $$$ in costs even it you do it yourself.
TAKE THE FUEL LINE OFF THE ENGINE SIDE OF THE PUMP WORK FROM THIS POINT BACK TO THE TANK.PRIME THE LINE FROM THE PUMP TO THE TANK WITH FUEL.RECONNECT FUEL LINE BACK TO THE PUMP FROM TANK. HOLD BACK PRESSURE WITH YOUR THUMB OVER THE PUMP ENGINE SIDE .TURN THE PUMP ON .IF IT DOES NOT PRESSURE UP THE LINE IS CLOGED FROM THIS POINT TO THE TANK.THE FLOAT HAS NOTHING TO DO WITH THE FLOW OF FUEL FROM THE TANK! AFTER YOU GET FUEL TO THE PUMP FROM THE TANK REPEAT THE PROCESS TO THE CARBURATOR SIMPLE PROCESS OF ELIMANATION! FUEL IN TANK>PUMP>CARBURATOR>ENGINE > MOTER RUNS
well the fuel gauge is wrong for sure which usually results in the float on the fuel pump being bent when put back in by technician or someone who is not careful when they put it back in for sure happens all the time the gauge says one thing but its out of gas.but if you have not had fuel pump put then when the fuel levels gets low the pump gets hot and kicks the reset thus shutting the fuel pump.and the on board fuel miles to empty are never correct usually they will run 10 to 15 miles after the miles 0 anyway they are almost never correct replacement of the float should remedy the problem but unfortunately the assembly has to be changed fuel pump and all cause it all one.
there is a float that floats on top of the gas inside the gas tank. this is connected to the sensor which goes to the fuel gauge. this float may have come off or got saturated with fuel so the sensor arm is stuck at the bottom of the tank. you can take the car up to autozone for a OBD reading but it will most likely have to have to have a new assembly. its inside the gas tank. the gas tank has to come out and it takes a weekend to do this. if you have a handyman in the family tell him you need a new sending unit in your gas tank. it may be integrated with the fuel pump as a whole assembly. you can go to autozone.com for the instructions. I will send along a link. the procedure isnt too bad usually if you take your time. run it all the way down on gas and keep a spare gas can if you run out. get it home on empty and drop the tank.
good luck and be careful.
my impala,s back seat folds forward,pull up trunk carpet from back seat.remove inspection plate,then undo fuel pump from tank,sending unit on fuel pump has brass fingers that touch a contact surface,carefully remove clip holding float to pump,you need to bend carefully the fingers,so that they will contact better.reasemble play with float to make sure fingers stay in contact with contact surface.
Uncouple the fuel line coming from the pump at the carburetor, place a clean can under the line, and have someone operate the starter--you should have fuel shoot from the line in spurts as the engine turns. If it does, then the entry port on the carburetor is plugged. Remove the float assembly and pull out the float needle valve. Hook the fuel line back to the carburetor and try the starter again, there should be fuel pumping into the float bowl. If not, check to see if there is a filter on the fuel inlet path that may be plugged. If no filter, remove the float needle seat to see if something is blocking the fuel passage. If all else fails, use compressed air to blow backwards through the needle seat (remove the fuel line again). Hope some of this helps!
Even if that was true, the car would run for 20 seconds without any fuel in the line, because the carb would have gas in the bowl. Why was the fuel pump replaced? How do you know theres no gas in the line? The check valve in the fuel pump should keep fuel from going backwards into the tank. The carb should hold gas, if not, find out why.
It could be a couple things, fuel pump or your fuel float inside the tank is going. Best best depending on what you want to spend. Call a junkyard for a replacement or a scrap yard/ salvage parts.
You may want to also put a large carboard box under the car (laying flat) to see if the gas tank is leaking too.