Ford F-150

How do you repair the fuel gauge of a 1988 Ford F150 Needle moves when truck is rocked so float seems to be working?


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2013-11-05 00:30:45
2013-11-05 00:30:45

My 1988 Ford Thunderbird has a digital gas guage. Last week it stopped working. Now all it reads is E (empty) How can I fix it?

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A needle can be made to float on very still water.

Yes, you can float a needle I have done it before. It doesn't have to do with density though it has to do with surface tension.

the way it float is surface tension!!

Surface tension can allow a sewing needle to float on the surface water.

The problem is most likely in the float bowl. The float could be bad. The likely cause is the needle valve that is control by the float is stuck, or dirt has gotten between the needle and needle seat. This is an easy fix. Carefully remove the float bowl. The float will be held in place by a pin. Remove the pin, and float. Check that there is no fuel in the float, and that it floats in gas, if not replace. The needle valve will come out with the float, as they are connected by a wire link. Make sure needle vale is clean, and able to move freely inside it's housing. Check the bottom of the housing at the needle seat to make sure it is clean of dirt. Reassemble, and you should be ready to go.

I would suspect a bad needle valve and seat in the carburetor. The float level can also be set too high. I would replace the needle valve and seat and check float level.I would suspect a bad needle valve and seat in the carburetor. The float level can also be set too high. I would replace the needle valve and seat and check float level.

Water surface tension hold the needle on the water surface.

The needle has a greater density than water, a ship does not.

For something to float in water, it must be less dense than the water itself or filled with air. Obviously not filled with air, a needle is less dense than water, depending on the size of the needle.

Tape the hole and it will sail on the water!

The needle drops to allow fuel into the float bowl and rises against the seat to shut off the fuel from entering the float chamber.

Due to surface tension, the upper surface of water acts like a stretched membrane which enables it to float a swing needle.

The float could be stuck because of stuck needle valve, or rust. The float could also be leaking and be full of fuel.

Because of the hydrogen bonding between water molecules, water has a high surface tension. This allows the needle to float on the surface of the water in a glass.

It will float if placed carefully enough.

A needle is fully metal whereas a ship is hollow so it floats

The needle and seat have dirt stuck between them, the needle and seat are worn out, the float is not adjusted properly or stuck, the float has failed (no longer has buoyancy), excess fuel pressure,

i think that vol of water underneath the needle when it is dropped on water parallely is more which prevents the needle from sinking.

The needle's does not break the surface tension of the water.

Surface tension.surface tension does

A needle doesn't float because there is very little air in a needle. Metal is much more dense than wood, which is what most boats are made of. When a boat is made of metal, there are air stores inside of the boat that keep it afloat.

It very well could be, or a problem with the float. Remove the bowl off the carburetor, remove float, needle valve, and seat. Clean all parts good with carburetor cleaner. Float the float in some fuel to make sure it floats (when should not that any fuel inside of it). Put needle valve, seat, and float back on and open fuel valve a small amount, lift float up to see if it will shut fuel off, if it does reinstall bowl. If not you may have to replace the needle and seat.

sounds like you have a float that is stuck. when the float stcks down it allows more gas into the carb. you may need to pull the carb to clean the float needle and seat.

The total weight of the surface area of a boat is less than than the weight of a body of water of the same size (buoyancy), so that is why it floats. A needle sinks because a body of water with the same size is lighter than the needle. Note: It is entirely possible to float a needle on water. It requires a bit of doing, but it can be done.

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