1959 Superior Cadillac Ambulance

A couple of questions.-

Gas gage is incorrect. Sometimes stuck on full. Has anyone ever dropped the tank and replaced the sending unit? Is the sending unit unit different than the regular passenger car? Suggestions are appreciated.

Also looking for the side molding for both sides. Front to back.

Thanks in advance.

Joe Unrein

Sending unit for the 59 will be the standard sending unit for a 58 caddy. The tank is the standard tank out of a 58 They did not change the ohm reading on them until around 64.

Thanks John!

Looking for the side molding for both sides. Front to back.
Any leads on this?

Post a profile of the molding. These moldings are stainless steel and if you can find enough parts they can be welded together to make up the lengths that you need. Once welded and polished, they look like new. Finding the correct mounting clips is going to be a bigger challenge, but if you have a sample, that will help to get what you need. If you have the originals, they can be repaired to look like new so you won't have to buy anything. I have a local shop that I use for repairing stainless moldings, and he has worked wonders on parts that one would have deemed to be trash.

Thanks Paul! I do have all the originals. I'll look into repairing them.

So it appears the fuel sending unit is not the problem. It's the gas gage on the dash. I'm not willing to dismantle the dash to replace/repair the gage. I am willing to add an after market gas gage somewhere else in the car. I've been dealing with out an accurate gas gage for years now, but for indoor venues in the Denver area the fire departments are now requiring 1/4 tank of gas or less to display cars indoors. So my mechanic needs to know the ohm ratings that the sending unit uses so we can purchase the correct after market gage. The Cadillac shop manual doesn't show this on the wiring diagram. Thanks!

I recall it being 11 for the older one. But i have been wrong before. The is a repair service in the vendors or you could goggle it and ask them what it is. To get some one that knows.

I have very rarely ever seen a dash gauge go bad, so more likely it is the wire from the tank to the sender, or the tank sender itself. To check the wire, remove it from the sender if possible, and then ground the wire. The gauge should go to either the full or empty extreme. Apply 12 volts to the wire from the battery, and it should reach the opposite extreme. If it does that, then the gauge is OK and it is the sending unit inside the tank that is defective. Many times it is that the copper float has developed a leak causing it to sink to the bottom of the tank, or it has fallen off the sending arm. It can also be that the sending itself has gone bad, and in that case, you will need to find a replacement or send it out for repair. Check the Recommended Vendor forum for people who repair sending units.

Thanks for this information Paul.