derrik38

2000 s10 pickup 4x4.fuel relay switch. is it in the fuse box.the one under the hood.black spuare with 4 prongs.our is that a fuse?

MT-2500

The fuel pump relay is in the under hood relay/fuse box.
Should be marked on underside of box cover.
What kind of trouble are you having with it?
MT

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MT

derrik38

my fuel gauge cant decide if its emty our full.jumps around .yesturday it said empty for a few mins,now it says full.and bonces alot up and down.i whiched the relay with the horn relay same type and it still does it.im guessing its the fuel pump sensor?

old_master

The fuel level sensor is faulty, has a poor connection, or has a poor ground, located on the frame rail, driver side next to the fuel tank. On some vehicles, the fuel pump and the level sensor are serviced as a module. Some are serviced separately, check with your local parts store.

derrik38

thank you

mike2004tct

On my 97, the ground strap grounds the filler neck to the frame. It doesn't ground the tank, as there's a rubber hose about 6" long that connects the filler tube to the tank.

The ground for the level sensor is part of the wire harness for the level sensor.
(at least it is on my '97). There's two separate connectors on the fuel pump assembly, a power connector, and a sensor connector. The housing is completely plastic, so there's no ground path for the sensor or the pump motor to the tank. (I checked Advance Auto parts, the pump assembly is the same type as my '97, and you can replace the level sensor, but you'd need to get that from a dealer for ~$100.00, or buy the whole pump assembly for ~400.00 from Autozone, Advance, etc)

So, I'd guess a bad sensor (these trucks are known for it).

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