Im still running the factory 15 gallon sending unit. It now takes a while to come off the full mark. So far it seems to have the same accuracy as it did before. I just filled her up a few minutes ago because the needed was just below 1/4 tank. I squeezed 17 gallons in it ... close enough for me. With the extra capacity it hurts the pocket a bit more to fill up. But... I do go a lot farther between fill ups.I did mine when the tank was out to replace fuel pump. I replaced the sending unit with a 20 gallon so my gauge is fairly accurate. I still don't go below 1/4 tank, just in case.
I had a 92' that was reading all kinds of crazy levels left...so I had to run it dry with a gas can in the back. Found out fuel sending unit was bad and it said a little less than half tank in it when in fact it was empty.My '93 fuel gauge sits at Full for about 100 miles and then it drops like a rock and by 150 it shows 1/4. I'm curious if the PO did this mod but haven't had a chance to test it to see how far it can go before truly being on E. One of these days I will carry a fuel can with a few gallons in it and run it as far as I can. Any issues with running it until she stops dead?