Mid Mod Guy Posted August 3, 2019 Report Share Posted August 3, 2019 I took my 63 Avanti to the gas station today. The fuel gauge showed one mark above empty. I put the gas nozzle all the way into the filler neck and filled it until it clicked off. I assumed it was full. But it only took 6.7 gallons. I was afraid to fill it more due to the risk of spilling fuel on the body. Is it true that our cars have 21 gallon tanks? If so, do others find that gas pumps click off too early? Should I keep filing it further? Perhaps something about the design of the filler neck signals the pump to shut off too soon, or maybe my fuel gauge is inaccurate. I'm looking for experience here. Note: I had a Triumph Spitfire that had the fuel tank filler just in front of the trunk lid, right behind the seats, in the center of the car. I once overfilled it and gas poured and sprayed everywhere, and with the top down, it was not pretty. So I'm hesitant to overfill. Link to comment Share on other sites More sharing options...
Gunslinger Posted August 3, 2019 Report Share Posted August 3, 2019 The gas tanks are rated at 21 gallons but many have reported they can't get that much into them. It's best to not fill them all the way...especially in the heat. The gasoline will expand and go right up and out onto the quarter panel quickly if the car is parked on any kind of slope. To save the panel from damage from the pump handle you can cut a piece of thin rubber and mount it on the filler neck. On the '70 I had I tried one cut for a '78 Corvette and it worked beautifully. Link to comment Share on other sites More sharing options...
Mid Mod Guy Posted August 3, 2019 Author Report Share Posted August 3, 2019 Thanks @Gunslinger. My car came to me with a slight discoloration from gas spilled below the filler, so I will definitely be cautious. Link to comment Share on other sites More sharing options...
Gunslinger Posted August 5, 2019 Report Share Posted August 5, 2019 (edited) Here's what I did for the '70 Avanti I recently sold...this is a pre-cut piece of rubber made for a '78 Corvette that Corvette specialty companies sell. It works just fine and folds up neatly behind the gas cap door. Edited August 5, 2019 by Gunslinger Link to comment Share on other sites More sharing options...
Avanti83 Posted August 5, 2019 Report Share Posted August 5, 2019 2 hours ago, Gunslinger said: Here's what I did for the '70 Avanti I recently sold...this is a pre-cut piece of rubber made for a '78 Corvette that Corvette specialty companies sell. It works just fine and folds up neatly behind the gas cap door. An excellent idea. My 83 came with a similar piece installed by the factory. This is a great solution for the earlier models. Link to comment Share on other sites More sharing options...
Dan S Posted March 23, 2020 Report Share Posted March 23, 2020 I couldn't find one for the Corvette, but this one for a Porsche 911 that looks like it should work. I ordered one and will post the results when it arrives. https://www.aasesales.com/products/g4b-a82-b-102400?variant=7681388838940 Link to comment Share on other sites More sharing options...
mfg Posted March 23, 2020 Report Share Posted March 23, 2020 (edited) As far as the nozzle 'clicking off' too early, I've experienced the same thing with all of the Avantis I've owned if I fill the tank too fast.........Slow down on the fill, and it will take the gas! PS......Assuming your fuel gauge is accurate! Edited March 23, 2020 by mfg Link to comment Share on other sites More sharing options...
MARK Posted March 25, 2020 Report Share Posted March 25, 2020 with my Avanti R2 and my 63 and 64 Hawks, I really watch mileage. I take a cell picture when I gas up and just watch the mileage. Sometimes a full tank is really full, othertimes, I think Im driving on fumes Mark Link to comment Share on other sites More sharing options...
Stan Gundry Posted March 29, 2020 Report Share Posted March 29, 2020 I found the protector flap pictured above by Gunslinger for sale on EcklersCorvette.com. It was hard to find, so here is the name and the part number: Gas Guard, 25-106419-1. Link to comment Share on other sites More sharing options...
Stan Gundry Posted March 29, 2020 Report Share Posted March 29, 2020 I am sorry everyone, I chose the wrong part number in my post a moment ago. Here is the correct part number for the one that gunslinger identified: 25-107849-1 Link to comment Share on other sites More sharing options...
studequest Posted March 29, 2020 Report Share Posted March 29, 2020 (edited) NIFTY IDEA GUNSLINGER Well., I put in a new sending unit and clearly it is not correct because it is not moving past 1/4 tank and as I ran out of gas today that is clearly not Normal so my new empty will be at 1/4.. When I filled up I had 18.6 gallons and it was not all the way full so I believe it must be a 20 gallon tank I plan to go off mileage at 12 ,pg so a total of about 210 miles between fill ups PLUS a 2 gallon gas can in the trunk!!! Edited March 29, 2020 by studequest Link to comment Share on other sites More sharing options...
studequest Posted March 29, 2020 Report Share Posted March 29, 2020 Anyone else getting over 20 gallons Anyone with fuel gauge reading issues Link to comment Share on other sites More sharing options...
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