Stupid question: gas station filling - FFCars.com : Factory Five Racing Discussion Forum
 
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post #1 of 17 (permalink) Old 08-18-2019, 04:57 PM Thread Starter
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Stupid question: gas station filling

Stupid? Maybe, but it's been kicking around in my mind for a while, so thought I would ask. To date, I have only added fuel at the shop using a 5 gallon can. When the car gets back from paint and I get it near finished, I'm going to drive to the nearest station for a fill up.

My question: with the setup of the filler on our cars, does the auto-stop on the filler nozzle work correctly, or do you have to meter it out estimating how much you need? Any recommendations for filling up at the station that doesn't involve gasoline spewing out of the filler door onto hot exhaust pipes? 🙂


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post #2 of 17 (permalink) Old 08-18-2019, 05:04 PM
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This is absolutely not a stupid question because I worried about the exact same thing. 3 weeks into being legal I have been to the gas station 3 times (8 mpg...). I was more cautious the first few times but the pump shuts off for me just like my daily driver. Looking down the filler tube you still don’t see the gas level so all seems well. I think it runs off of vapor maybe. I’ll let others chime in on the science of it all.

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post #3 of 17 (permalink) Old 08-18-2019, 05:23 PM
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Agreed not a silly question. Yes, they shut off if in good repair. But I also don't take any chances. At most gas stations, at least around here, the nozzle has a big plastic ring above the handle that makes a nice seal around the top of the LeMans cap. So I generally push the ring against the cap and work the filler manually. If it should overflow, isn't going to splash everywhere. But I know my gauge well enough that I know how much is needed to fill, so also don't typically let it run until is shuts off. Also get ready for the questions and conversations. Almost never fill mine up that someone doesn't say something. Just this week someone asked me if it was a Jaguar.

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Last edited by edwardb; 08-20-2019 at 12:19 AM.
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post #4 of 17 (permalink) Old 08-18-2019, 07:31 PM
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My own car is a Mk3 with a modified Fox fill tube which includes the flapper at the top so it doesn't take fuel as quickly as the wide open tubes used on Mk3.1 and Mk4 and causes the autostop to trip prematurely. Because of this I just work the pump nozzle manually. I've filled some customer cars with the later version unrestricted tube and the autostop works fine (I think you could almost use a NASCAR dump can on these!).

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post #5 of 17 (permalink) Old 08-18-2019, 10:50 PM
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It has always worked fine on my Mk4.

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post #6 of 17 (permalink) Old 08-19-2019, 02:57 AM
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No problem with my Mark II. And someone asked me if it was a
Viper!

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post #7 of 17 (permalink) Old 08-19-2019, 02:59 PM
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I have the Fox filler tube with the flapper. The shutoff at the pump didn't work - more accurately it would not shut off fast enough and it would spill over.

If I want to fill up to "FULL" I have to leave the key in, squeeze the nozzle halfway, and watch the fuel gauge. Takes about 2 minutes to fill from 1/4 tank.

Good thing I don't live in one of those states where you can't pump your own gas.

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post #8 of 17 (permalink) Old 08-19-2019, 06:21 PM
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"And someone asked me if it was a Viper!"

My favorite was walking in to pay and hearing the male behind the counter telling the female all about that 'green vintage Porsche' out there on pump 10...

I'd have finished a long time ago if I knew they were this fun!


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post #9 of 17 (permalink) Old 08-19-2019, 08:51 PM
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My MKIII has the standard donor fill tube cut in half and joined with the rubber connector. I've never had an issue with filling or any overflow, always lock the handle wide open and when its full it shuts itself off. When I was building the car I had read about some of the problems folks had with the set up not taking gas properly. When I cut the tube apart I saw that it had a vent channel attached inside it and guessed that if that was no longer connected it could be a problem. I attached a piece of soft copper tubing at the bottom that extends up past where end of the gas nozzle would sit that allows the tank to vent some what like it did in its original form. I'm guessing this has helped with the ability to fill at full flow of the nozzle. From what I've read over years I'm some what convinced that a lot of the problems folks have along this line is the lack of a good tank vent.

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post #10 of 17 (permalink) Old 08-19-2019, 09:59 PM
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https://auto.howstuffworks.com/fuel-...-full-tank.htm

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post #11 of 17 (permalink) Old 08-19-2019, 11:28 PM
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My MkII will shut off fine at the lower pump speed but not on the fast one. It's only happened a couple of times but the gas runs down toward the back of the car not toward the pipes.

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post #12 of 17 (permalink) Old 08-21-2019, 04:57 PM
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DON'T FORGET

Gas filler nozzles vary from state-to-state and individual experiences vary.

The filler nozzles are super old-school in California at the Casinos. No sleeve or collar. (Indian Gaming Casinos are exempt from many different types of regulations.)

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post #13 of 17 (permalink) Old 08-21-2019, 05:21 PM
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Back when I was first building my 3.1, with the same set up as Dave's, I'd read the warnings of filling at full pump speed, and fuel backing up the fill tube causing some to spurt out. Because of that, I never have run it at full speed when filling.

One station I have fueled up at a few times, has this crazy system, that where if another person is filling up at the same pump, the fuel is delivered quite slowly to your side. But when they stop pumping, suddenly my pump jumps up, to pumping twice the volume it was. Then I've had fuel suddenly back up the filler, and splash out.
It's rare for me to actually fill it all the way up, other then before winter storage, I usually just pump $30-40, if I notice it getting low. (I get great mileage)
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post #14 of 17 (permalink) Old 08-21-2019, 11:26 PM
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one thing we learned at the Build School is the vent valve for the gas tank is now bigger to allow proper venting so the pump wouldn't shut off prematurely... if you have shutoff issues, you may want to upgrade the vent valve (yes it's on top of the tank)

just learning... planning... scheming :)

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post #15 of 17 (permalink) Old 08-22-2019, 12:40 AM
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This same thing happened to me once, a long time ago

I have run my Mk II FFR Cobra for 13 years now, and the fillup process has always triggered the station's auto-stop every time but once. That one exception occurred ironically at the Mobil station located very near the FFR home base in Wareham. I was never able to understand why that one event occurred, and that was several years ago after I had attended an FFR open house. As an aside, my gas filler installation is the very same as the one FFR described in its build manual. It's possible that the filler(s) that might cause you issues with fuel splatter are set to a higher than usual pressure. That what seems to have happened in my case in Wareham. When that occurred, it happened before the tank was actually full, adding to the mystery. BTW, my car has now logged in excess of 21,000 miles.
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post #16 of 17 (permalink) Old 08-23-2019, 02:45 PM
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Big Bore Vent Check Valve Kit

https://www.breezeautomotive.com/sho...eck-valve-kit/


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post #17 of 17 (permalink) Old 08-23-2019, 06:58 PM
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Gas Spill

The first time I stopped at a gas station i assumed the pump would shut off like a new car. I was wrong. I dumped gas all over the ground and made a mess. Not to mention the smell. A few issues. I use the old style sender and filler tube so they do not seal all that well. Second, the gas gauge since it is a float on my vehicle does not settle down until after the tanks gets filled. So while I am filling my needle shows less gas than I actually have. I fill up to a little less tan 3/4 of a tank then once I stop pumping the needle slowly creeps up to full. Lucky if I ever over fill I always look and the gas evaporates quick. The trick is to just not over fill in the first place.
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