So I am planning to drop the tank in my 67, clean it out a bit. However in the book it says you CANNOT replace the filter in the tank? You have to get a new tank?
I am sure there is all kinds of crap in there. Book says just to blow compressed air in there. My 78 came with a filter sock I could replace.

 

This seems unlikely. I dropped the tank on my '67 Delta 88, and the sock filter was separately removable if I had wanted to replace it and if I could have found a replacement (which I couldn't). I replaced the entire sending unit with one for a '72 Delta 88. It was a drop-in replacement, and I capped the unneeded return line.

 

On this car the fuel line does not go from the sending unit, like in my 78. Strange, but thats how it is in the book. The sending unit really is just a senging unit. The fuel lines go from another place in the tank

 

Reason I am wanting to drop the tank is because when the car goes below half, it runs out of fuel. Dont know if the sending unit is defective, or there is some kind of crap in the tank...

 

Dont know if someone else found a way around this

 

You were correct originally. According to the '67 chassis service manual, the in-tank fuel filter is located "on the fuel pick-up pipe and is not replaceable except by replacing the gas tank."

The manual does say that a clogged filter can be cleaned by blowing air back through the pick-up pipe.


When the car runs out of fuel and you refill it, how much gas does it take? That should tell you whether or not the tank really is empty or is only half-empty as the gauge reads. The tank capacity is 24 gallons. If you run out of fuel, it ought to take close to that to refill.

I actually think the pick-up pipe filter is not the problem. After all, why would it work fine as the first half of the tank's fuel is used up, but then not let the second half out? Also, when you do run out of fuel, how far has the car gone since fill-up? If only 100 miles or so, then, yes, the tank is likely still half full, and something is preventing the second half of the tank from getting drawn into the fuel system. But if it's more like 200 miles, then the tank is likely empty even though the gauge is still reading 1/2.

Where does the fuel gauge actually go when the tank is just filled? On the F, or is it past the F? The reason I ask is that the gauge on my '73 Custom Cruiser works, but it's a bit off as far as correct readings. When the tank is full, the needle is about as far past the F as the distance between 3/4 and F. When the tank is nearly empty, it's reads about 1/4. So it's like the needle has been shifted one "unit" to the right. As long as I know this, it's no problem. I just know that when gauge reads half-way between 1/4 and 1/2, I really have about 1/8 of a tank left, and it's time to refill. Maybe your gauge is doing something similar?

I would suspect a bad sending unit. You can partly check this without removing the tank by disconnecting the sending unit wire coming from the tank with the wire coming from the front of the car that connects to the gauge. It's likely orange in color, and the connector should be somewhere behind the rear bumper near the license plate.

If you pull this connector apart and ground the gauge side, the gauge should immediately go to E when the ignition is ON. Remove the wire from ground with the ignition ON, and it should immediately go to F or possibly well past it.

If the gauge does these things, the gauge is fine, and I would turn my attention to the sending unit. If the gauge only goes down as low as 1/2 when you've grounded that wire, then your gauge itself is the culprit.

I don't know that new sending units are available for your car. They weren't for my '67, and some research revealed that one for a '72 would work. But in my car the sending unit and fuel pick-up pipe are integrated into the same unit. On your car, they're separate, and I don't know if a sending unit for a non-Toronado would work.

 

"I don't know that new sending units are available for your car. They weren't for my '67, and some research revealed that one for a '72 would work. But in my car the sending unit and fuel pick-up pipe are integrated into the same unit. On your car, they're separate, and I don't know if a sending unit for a non-Toronado would work."
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Try fusick.com
load the pdf Toro catalog, look thru it.
Get ingenious- if a similar model car's sending unit fits the hole, but has a fuel tube you don't need... Solder it shut and Bob's your uncle, you're done.

While you have the sender hole open peek in there and see what's up with the pickup tube, sock/filter, etc.

 

Not sure what you're talking about here. There is no Fusick "Toro" catalog. Toro parts are included in their catalog 22BC, which is their big-car catalog. There is no mention whatsoever in this catalog of fuel tank sending units, Toronado or otherwise.

As far as being "ingenious," it's not just a matter of getting one that fits the hole. Yes, the hole size is pretty standard, but it's the depth of the sending unit that matters. Since these sending units include the fuel pickup pipe as well, they're meant to extend from the top right down to the bottom of the tank, so clearance in this regard is important. Get a sending unit that's too long, and you won't be able to push it far enough into the tank to lock it in. Get one that's too short, and it won't give you an accurate reading of the fuel level as it will read empty before the tank actually is nearly empty.

The easy part is closing off the unneeded fuel lines once you've obtained a sending unit that will fit. The hard part is finding one that will fit.

 

There isn't any filter in the tank the only one is in the carb. Lower the tank and pull the sending unit and test with a ohm meter.

 

What are you talking about? Yes there is. It's mentioned right there in the factory service manual. The manual says it cannot be replaced other than by replacing the entire tank. Waterzap even included a scan of the relevant portion of the manual. We've been through this.

 

Thanks. I have to admit, haven’t done a lot of work on this. The car only ran out of fuel once. Of course it was raining. My lights don’t pop up, and at that point I did not have brake or indicator lights. Just made it to the gas station. The fuel gauge was around half, and it started to sputter. Just, just made it to the gas station. If I remember it took around $30 or so. Definitely not empty. There is definitely something wrong with the tank. For example, it always feels a bit wet at the back vent tubes. I replaced the cap, still I think there is some evaporation there.
The unit is still available. Saw I can get them on ebay for around $100. Actually the 68 Eldorado unit, but looks the same as the pics in the book.
I just dread having to take off that tank. I have pretty much done it with every car I have owned, and I hate doing it.. Just to see what it looks like and clean it out. Every time is like a surprise. My 76 Seville was a bit of a mess, and ended up repacing the sending unit. My 78 Eldorado looked like new inside. Literally looked like new. Didn’t even bother to clean it, there was nothing to clean.
If you really want to know how a car was taken care off, look in the tank.

 

At today's prices, $30 buys less than 10 gallons of gas, so it would seem you have a fuel pick-up problem. For all you know, the pickup pipe has broken off halfway down, how I can't possibly imagine, and it doesn't reach down far enough to get all the fuel.

I think the only way you're going to get to the bottom of this is to remove the tank and look inside.

 

Well I looked in my old tank and my NOS tank for some kind of filter or screen and I couldn't find one even with a mirror looking thru the sending unit opening.
That's what I'm talking about!

 

Do you have a Toronado? If not, the filter is ON the sending unit. If you took the sending unit out and looked into the tank, of course you wouldn't see it. It would have been on the end of the sending unit you just took out.

If you do have a Toro, according to the manual, the filter is inside the fuel pickup pipe, and it isn't clear from the manual if the filter is visible by peering into the tank with or without a mirror. I would guess it isn't easily seen as the pickup pipe points down.

The bottom line is, just because you can't see a filter doesn't mean there isn't one there. I would guess that every fuel tank Olds and every other manufacturer has ever produced has a filter inside it somewhere. Crud can and does build up in the tank, and you don't want it getting into the fuel line regardless of whether or not there is another filter later in the line.

 

This is what the fuel sending unit looks like for the Toronado

http://www.ebay.com/itm/67-68-69-70-...tr#ht_89wt_904

No pickup, no filter. Just will have to drop the tank and see whats going on there.

 

Well, you wouldn't expect these if all it is a sending unit.

Given that the gauge was reading 1/2 and you needed less than 10 gallons to fill your supposedly-empty tank, my money is on something other than the sending unit.

 

The sending unit was broken. The little copper band was torn off. Also noticed that the negative wire was not connected to the unit. Strange. Have not had time to look into the tank with a camera, but busy doing the fuel hoses. Found something strange though. Underneath the engine. The fuel lines go in there. Its not in the book. Book just shows fuel and return lines going to the tank.

 

The box

 

Just looking at it from below the car, there seems to be some kind of shaft in there. Maybe a anti theft valve or something? That could be the reason the car cut out while the tank was half full. Might not have anything to do with the tank, maybe this stupid thing..
Just going to bypass it anyway.
Sending unit wasnt fully broken. The copper band was broken, but touching. So that could have given a wrong reading too.