Gas tank won't fill to full.

Topic: Gas tank won't fill to full. (Read 13194 times) previous topic - next topic

Gas tank won't fill to full.

Reply #45 – June 18, 2014, 09:31:46 PM

Lou, I have an extra black plastic part you're talking about. If you want it, it's yours.

Gas tank won't fill to full.

Reply #46 – June 18, 2014, 09:35:30 PM

Quote from: thunderjet302;434972

How full was the tank? It takes quite awhile for the gauge in my Thunderbird to come off F. F is 22 gallons. The next number below F is 20 so it will take a good 30+ miles of "normal" driving to get it to come down.

I had 6 gallons I think. Next morning it read 9. Day after read 7. Should have read 4 by that point. Put $30 in and it stopped. I've run it that low since without issue.

Gas tank won't fill to full.

Reply #47 – June 18, 2014, 10:12:46 PM

Quote from: 1BadBird;434981

Lou, I have an extra black plastic part you're talking about. If you want it, it's yours.

Thanks for the offer. I managed to JB Weld mine back together. I did it from the back. Looks just like stock.

Gas tank won't fill to full.

Reply #48 – June 18, 2014, 10:14:16 PM

Quote from: V8Demon;434982

I had 6 gallons I think. Next morning it read 9. Day after read 7. Should have read 4 by that point. Put $30 in and it stopped. I've run it that low since without issue.

If I run mine below 7 gallons it will sometimes go to E and slowly climb back up to 7. I think it's a float/sender issue.

Gas tank won't fill to full.

Reply #49 – June 18, 2014, 10:18:52 PM

I wonder if that could be the issue with my TC. Depending on how the car is parked tilted one way or the other, depends on how full the tank gets and how the gauge reads when I'm done. Doesn't read clear full all the time. But I have a regular type gauge, not the digital one. I think I'll check that filler neck here when I get a chance. Good thread to read.

Gas tank won't fill to full.

Reply #50 – June 18, 2014, 10:20:26 PM

The best way is to either SUMP the tank and install a rail pump and or mount the pump horizontal to the bottom. problem fixed.

Gas tank won't fill to full.

Reply #51 – June 19, 2014, 01:06:57 PM

Quote from: TOM Renzo;434989

The best way is to either SUMP the tank and install a rail pump and or mount the pump horizontal to the bottom. problem fixed.

Eventually I will do that. For now I just keep the tank above 1/2 full till I get around to it.

Gas tank won't fill to full.

Reply #52 – June 19, 2014, 03:03:40 PM

I know Im a little late here, but mine did the same thing. The gas pump shut off at 17gallons. I have a 21gallon tank. I tried filling it up again. Nothing. about a week later, filled up at a different station, never happened again. weird.

And regarding your instrument cluster, my dads friend worked a ford dealership and he said the clusters go bad every now and then. Mine had a issue where the speedo didnt show anything. Just blank. Didnt even read 0mph. Blank.
Needless to say, I got a new cluster. No problems since.

And important side note, if you have a full digital cluster, your odometer reading is stored IN the cluster so if you swap clusters, your odo is way off. And you have to do maths to calc your actual mileage.
Oh, and I know the digital odometers roll over at 200K miles....the go from 199,999.9 Miles to 100,000.0 miles

Gas tank won't fill to full.

Reply #53 – June 20, 2014, 05:29:58 PM

I had to replace a tank in another car and noticed there was no conductive path from the filler tube to the car or any other part of it. The filler was surrounded by rubber where it entered the tank on one end and the other end bolted to a large plastic shroud type thing. There was no ground strap or anything I could find that would allow any electrical difference of potential (static charge) between the filler tube and the rest of the car to safely neutralize. Am I misunderstanding something here?
It's not a Cougar or TBird so I didn't think this question qualified for its own thread.

Gas tank won't fill to full.

Reply #54 – June 20, 2014, 11:52:35 PM

Believe it or not the fill pipe that is rubber contains carbon that conducts electricity fairly well. I once played a joke on a state inspector at an emission seminar in Ct. He was demonstrating how NOX can be easily repaired. He broke for a break and me and John stayed in the shop alone. So i cut a piece of 1/4 inch vacuum hose and replaced it with the coil center wire. Thinking the car would not run and drive this inspector nuts. Well the car started perfectly and ran just fine. I confessed doing it as a joke and we were all shocked that the car ran and ran perfectly. The reason was the hose was loaded with carbon that conducts. So we were told that those filler hoses are in fact conductive and do not need to be grounded. This seems like it's true as many cars we service do not have ground straps any more. have a good weekend guys.