Posted 2019-06-10 3:11 PM (#583224) Subject: Gas tank overflow fix?
Location: Chesterfield, Virginia
Is there any thing that can been done to stop the unleaded gas from splashing out of the neck when filling up our 59 Desoto? There must be something that will fit the tank neck that will reduce the size of the opening such as the flap opening on a modern unleaded gas tank.Thanks for any ideas on a fix.
Posted 2019-06-10 7:53 PM (#583247 - in reply to #583224) Subject: Re: Gas tank overflow fix?
Location: Frederick, MD
Some vehicles seem to be prone to that. My '95 Wrangler was terrible, my '71 Charger is also bad about that, the '55 Plymouth is about a 50/50 chance whether it's going to puke gas down the side of the car.
Posted 2019-06-10 9:16 PM (#583256 - in reply to #583224) Subject: Re: Gas tank overflow fix?
Location: Branson, MO
I have experienced the same problem with my '59 Firesweep. As much as I have tried to be super careful with an ear to the opening, I still get some splash even without cramming or over filling. Now I wad up an old towel and wrap it around the filler tube to absorb the splash and then make darn sure I wipe the side of the car with a clean wet towel after filling. It works!
Posted 2019-06-10 10:42 PM (#583263 - in reply to #583224) Subject: RE: Gas tank overflow fix?
Location: Southern California
yup mine did the same thing on my 58 plymouth. Now I never fill the tank to get around it, I fill it close to near full and look down the filler neck with a flashlight till I see the gas floating right around the base of the filler neck. Its alittle extra work but it works for piece of mind.
Posted 2019-06-12 2:36 PM (#583343 - in reply to #583224) Subject: RE: Gas tank overflow fix?
Location: Hilltown, PA
The issue you're having is because modern filling equipment flows at a faster rate than older stuff. They can do this because modern cars and trucks have a "fill venting" system that allows the air space/vapor inside the tank a direct path to the filler neck around the fuel flow, where it can be recovered by the nozzle assembly.
These older cars lack that system, consequently you are trying to force all that air/vapor out the same neck you're flowing fuel down - the result is splash back. This is exacerbated by low fuel fill locations like behind the license plate.
All you can do is fill slowly, especially near the end. Unless you're willing to make some significant modifications to your fuel tank and fill neck.
By the way that plate you refer to isn't to prevent splash back, it is there to prevent cross fueling, specifically using (no longer available) leaded fuel in cars with catalytic converters.