Fuel tank sending unit

[roboconklin]

My car showed 1/4 tank. But in actuality it ran out of gas. I had not driven it for a few months. I put 4 gallons of gas in it because it showed 1/8. and I wanted to run it and get rid of the older gas. I used ethanol free boat gas from WaWa. Well it died. But it restarted and would run out of gas with normal acceleration. So I limped it home. I drained almost 5gallons out and removed the sending unit to inspect. The gree(only) wire from the frost at had come loose from the bottom of the inside of the sender. I have had this car since 86 ,and it had come loose before(I see the (solder). I think it was a cold joint. I guess it could be fixed, but I would rather replace it . Only issue is that it has a factory return line.
The other possibility is like a 70 tank with a drain and corresponding sender. What are my options?

 

[giantpune]

Was there anything hooked up to the return? I can't say I've seen one of our 71-73 mustangs with a return line. What does the entire sending unit look like that you have? It could be somebody just snagged one that happened to fit in the hole, but it was not the correct one?

At any rate, the one you have looks rusty. I'd have a hard time putting that back in my fuel tank. If the inside of the tank looks anything like that, I'd have a hard time continuing to use the tank.

There does appear to be ford part D1ZF-9275-B, which is a sending unit with a return, but they're not common.

I would be inclined to buy a new sending unit and drill a hole and sweat in an elbow or use a commercial self-sealing return fitting on it. That one you have looks kinda crusty.

The float arm on the 69-70 one is a different length/shape than the 71-73. If you went with one of those, you may need to tweek the float arm a bit to get it closer to what our tanks need.

 

[roboconklin]

Was there anything hooked up to the return? I can't say I've seen one of our 71-73 mustangs with a return line. What does the entire sending unit look like that you have? It could be somebody just snagged one that happened to fit in the hole, but it was not the correct one?

At any rate, the one you have looks rusty. I'd have a hard time putting that back in my fuel tank. If the inside of the tank looks anything like that, I'd have a hard time continuing to use the tank.

There does appear to be ford part D1ZF-9275-B, which is a sending unit with a return, but they're not common.

I would be inclined to buy a new sending unit and drill a hole and sweat in an elbow or use a commercial self-sealing return fitting on it. That one you have looks kinda crusty.

I found a 65-68 with a return line. The tank has been replaced in the past and there is a line for the return and up front there is a port coming out of the fuel pump. So it is needed. I guess I’ll call the vendor and see if a 68 will fit

 

[roboconklin]

I found a 65-68 with a return line. The tank has been replaced in the past and there is a line for the return and up front there is a port coming out of the fuel pump. So it is needed. I guess I’ll call the vendor and see if a 68 will fit

It’s a c code 429 automatic

 

[giantpune]

I found a 65-68 with a return line. The tank has been replaced in the past and there is a line for the return and up front there is a port coming out of the fuel pump. So it is needed. I guess I’ll call the vendor and see if a 68 will fit

I edited the post above while you were responding.

The arm with the float is a different shape for different style fuel tanks. If you don't have the right geometry, the reading probably wont be all that accurate. But at least it'll be clean and new.

West coast cougar sells one for a 69-70 mustang with the return fitting. The other thing to look at is the wiring. You may need to get a little creative to connect the sender from the wrong year to the harness in your car.

 

[Hemikiller]

Simple enough to fix, just be sure to clean the wire and terminal really well and use soldering flux.

You could also send it to Desert Classics and he can restore and calibrate it for you.

https://desertclassicparts.com/prod...ng-unit-rebuilding-service-send-us-your-core/

 

[roboconklin]

I edited the post above while you were responding.

The arm with the float is a different shape for different style fuel tanks. If you don't have the right geometry, the reading probably wont be all that accurate. But at least it'll be clean and new.

West coast cougar sells one for a 69-70 mustang with the return fitting. The other thing to look at is the wiring. You may need to get a little creative to connect the sender from the wrong year to the harness in your car.

I just repaired mine. I tried to get a better penetration to the solder . During the preparation phase,I cleaned the body too. I’ll get it back on the road and keep an eye out for the correct one. That geometry part means inaccuracy. I’ll run out of gas again with the wrong one. So I just fixed it. I’ll plug it in electronically and check the gauge swing by simulating fuel level to be sure I didn’t melt the insulator heating both sides of the solder connection.

 

[Stanglover]

I confess to being a little confused. You say a c code 429, but you don't say what car. Nor does your info on the left.
If it's a Mustang 71-73, then the tanks are the same. The sending unit does not have a return but there is a vent tube from the charcoal canister in the engine bay to the top of the tank.
Original units are hard to find and many repops are not that good, however the best I found for my car was the Dorman 692232. Calibrate with an empty tank plus 5 US gallons of gas. That should read 1/4 full. If not jack the left side high enough to be able to remove the unit and adjust the arm without spilling gas. Use two floor jacks is what I did.
This is an original unit with number.

 

[giantpune]

I confess to being a little confused. You say a c code 429, but you don't say what car. Nor does your info on the left.
If it's a Mustang 71-73, then the tanks are the same. The sending unit does not have a return but there is a vent tube from the charcoal canister in the engine bay to the top of the tank.
Original units are hard to find and many repops are not that good, however the best I found for my car was the Dorman 692232. Calibrate with an empty tank plus 5 US gallons of gas. That should read 1/4 full. If not jack the left side high enough to be able to remove the unit and adjust the arm without spilling gas. Use two floor jacks is what I did.
This is an original unit with number.

There's this guy. https://secure.cougarpartscatalog.com/d1zf-9275-b.html