Sending unit question...

[samuellg1977]

Hi, I know it is probably here somewhere, but i just can't seem to find it...
I am trying to do a gas tank swap in my 63 SWB Stepside. As of now, I have a homemade tank, no sending unit, one fill tube, a vent hose, and one fuel line out to a mechanical fuel pump. I recently scavaged a 31 gallon fuel tank from a running 87 Blazer... What do all of those lines do that are sticking out of the sending unit / pump assembly? I am assuming all i need is one of those lines to feed the fuel pump. Do I need to buy another sending unit, or can I use this and just plug up the other lines? Which line do I need to connect my mechanical fuel pump to? Any advice will be greatly appreciated.

Sam

[brap999]

I'm not familiar with that particular tank, but one line is your fuel line, which you will connect to the fuel pump, one is probably a return line, and the other is probably a vent line?

As for a sending unit, you need a sending unit that matches the fuel gauge you are going to use. Your stock '63 fuel gauge requires a 0-30 ohm sender, and the sender in the Blazer fuel tank will not work with it. Later chevy went to a 0-90 ohm sender, and then after that they changed it to something else i believe.

If you do a search you may be able to find a 0-30 ohm sender that you can mount in that tank, removing the old sender. I know they do make a 0-30 ohm sender for our original tanks which were located in the cab behind the seat, but unfortunately the sender sits at a funny angle on its mounting plate, and this probably isn't going to work for your tank.

Your other option is to get an aftermarket fuel level gauge, which will come with sender to match it.

I have a Summit Fuel Cell in my truck, with a 0-90 ohm sender, and a gauge to match.