Fuel Tank Question

[BIG JACK]

This might be a stupid question,but how in the world can a fuel pump,fuel sender, and electrical connections be submerged in a fuel tank without ever starting a massive fire?? I always wanted to know. thanks

 

[JDraper]

Because all the electronics are sealed and grounded, so they never are in contact with the fuel or fuel vapors.

 

[2000StreetRod]

sealed

Although I haven't had to pull mine yet (thankfully) I suspect the electrical components are sealed and there is a thermal cutout for the motor to prevent overheating. Many forum members have had their engine die after driving for a while but then it will restart after sitting for a half hour or so. I suspect many times this is due to the thermal cutout on the fuel pump.

 

[Turdle]

Actually, there are connectors in the tank.
In fact you have to splice a high performance unit in with crimp connectors. I soldered and shrink taped mine. The possibility of arcing in the tank is there I guess.

On the other hand however, it makes sense as the fuel will directly cool the pump motor while it is submerged.

 

[firepop5]

In order to burn, any fuel must be mixed with the correct percentage of oxygen. In you fuel tank there is little to no oxygen, so the atmosphere is to rich to burn.

 

[gijoecam]

Actually there is a significant amount of oxygen in an empty fuel tank, just not in the correct proportion to allow it to burn. Also, the connectors and contacts on the sender, pump, etc. are all in constant contact with the fuel. After installing countless thousands of them back in the day, I can assure you there are exposed contact in there for sure.

My guess is that sparks are exceptionally rare to begin with, provided the wiring is intact. Electricity is going to take the path of least resistance, which will generally be through a wire, not through an air gap or through the fuel itself.

-Joe

 

[BIG JACK]

Hey Joe,,I`m getting ready to change my fuel pump,should I drop the tank or cut a hole in the floor to access the pump. 95XLT,,,,,,,,,,,,,,,,,,,thanks