Fuel door ?

[2lbgill]

A few years ago they had baffles inside the fuel neck to keep a siphon hose from being used. Could still be used.

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[Quaboag]

My 2023 has the in cab button.

 

[GPSMan]

So the pressure is to help gasoline longevity? And since the system is pressurized, they use pressure to test the evap system instead of vacuum? Thanks.

I already posted the answer.
It is to test for evaporative emissions.
Air is always coming in.
The feature is to detect gasoline vapors getting out.

If the pressure test fails, vapors got out, and you'll get codes, a check engine light, and a trip to the dealer.

Even very old cars had a vacuum release fuel cap. Vacuum was never allowed in a fuel tank.

A) you'll work against the fuel pump / fuel delivery system

B) you'll flatten your fuel tank like a Capri Sun drink pouch, or IV bag if you've never seen a Capri Sun, if you didn't have a vacuum release to allow air in.

C) if you consume 15 gallons : 60 liters of fuel, 15 gallons : 60 liters of air will go into the tank

In old cars it went in at ambient pressure. Here, slightly positive to check for leaks.

 

[crgator]

I realize the EB doesn't have the pressurized tank, but they could have at least given it a locking cover. I've never owned a vehicle that didn't have a locking cover, even the oldest car I drove from the 70s had one.

I've been buying new cars since 1968 and my 2019 Hyundai Tucson was the first one I ever had that had a locking cover. Shoot, many didn't even have a cover or door, just a gas cap.

 

[GPSMan]

Hey, cars with zero evaporative emissions will get slightly higher MPG because of it.

+1 for the environment
+0.1 for your wallet

 

[Bill K]

Jeez, where do you live that people steal gas?? This isn’t 1973 when gas was not available to many.

 

[icegradner]

Jeez, where do you live that people steal gas?? This isn’t 1973 when gas was not available to many.

Only one of the most expensive places to live in North America, which also happens to have a lot of people living at or below the poverty line, while they work 2 full time jobs. So yes, gas theft is a thing in some areas.

 

[RichardCranium]

I already posted the answer.
It is to test for evaporative emissions.
Air is always coming in.
The feature is to detect gasoline vapors getting out.

If the pressure test fails, vapors got out, and you'll get codes, a check engine light, and a trip to the dealer.

Even very old cars had a vacuum release fuel cap. Vacuum was never allowed in a fuel tank.

A) you'll work against the fuel pump / fuel delivery system

B) you'll flatten your fuel tank like a Capri Sun drink pouch, or IV bag if you've never seen a Capri Sun, if you didn't have a vacuum release to allow air in.

C) if you consume 15 gallons : 60 liters of fuel, 15 gallons : 60 liters of air will go into the tank

In old cars it went in at ambient pressure. Here, slightly positive to check for leaks.

Actually, gas tanks in non hybrid cars are kept at a vacuum, it is not a complete vacuum like outer space, but it is a lower pressure than ambient air temperature. That is why some older fords would tell you to check your fuel cap if you left it off or lose, because it would detect a vacuum leak in the fuel tank. I believe ford was the only company that had the warning. The rest would just set a check engine light. It was amazing the number of people that would come into the shop with a check engine light because they forgot to put their gas cap on.

Old cars actually would have problem if pressure was in their fuel systems. It was called vapor lock. I had a car (I think it was my ‘81 celica but I can’t remember) that would suffer from vapor lock. The car wouldn’t start and I would crack the gas cap. It would hiss, and then I would close the cap and it would start right up.
Also, if you have ever watched a car get smogged in California, one of the tests they would preform is a vacuum test of your gas cap. Vented Gas caps are vented for excessive vacuum or pressure, not for all pressure and vacuum.
So you did not answer my question of why the change from vacuum to pressure to test the evap system.

 

[GPSMan]

Maybe you need a different dealer for your

? You have your story backwards sir

Vacuum in a fuel tank is only a symptom of a vent failure.

Vacuum encourages any liquid, any fuel to "boil" aka turn to vapor. Pressure will help it stay a liquid.

Mixing two separate concepts, and not understanding laws of physics does not change the underlying laws of physics.

The question has been answered correctly above. You can choose not to believe facts to your own detriment.

 

[RichardCranium]

a quote from https://www.carparts.com/blog/evaporative-emission-control-evap-system-101-the-basics/amp/

• When the conditions are correct, the control module closes the vent valve and opens the purge valve, creating a vacuum in the system.
• The control module then monitors the fuel tank pressure (FTP) sensor to verify the system can reach a specified amount of vacuum.
• If the vacuum is lower than specified, the module assumes there is a large leak somewhere in the system and stores a DTC in its memory

so, again, you are wrong in saying that cars do not use vacuum to check for evap leaks.

now, since I was curious and wanted to know why Mavericks use pressure instead of vacuum to test leaks, I did some reading. Everything I found stated that the pressure is to help preserve the fuel and many hybrids use this type of system. Since they use a positive pressure pump to pressurize the fuel system, that pressure can also be used to check for evap leaks. There are even some non hybrid vehicles that use a pressure system to test for leaks instead of using the vacuum from the ICE. There are actually 3 types of Evap test systems currently being used.

so the correct answer is, that is what Ford chose to use.

 

[GPSMan]

Vapor lock is mostly caused by hot temperatures and not enough fuel pressure in the lines. Not pressure.

"
Problems with vapor lock are most common on older vehicles that have a carburetor and a mechanical, engine-driven fuel pump. This type of setup, which operates at relatively low pressure and locates the fuel pump a long way from the gas tank, increases the likelihood of a vapor lock between the tank and pump.

What’s more, vapor lock can have a significant impact on a carbureted fuel system, as the issue can lead to the float chamber inside the carburetor being depleted of gasoline. The engine is starved of fuel as a result.

Meanwhile, modern fuel-injected engines have the fuel pump located in the gas tank. The location keeps the pump running cool and the entire fuel system under higher pressure, thereby reducing the risk of vapor lock."

carparts.com

One of many sources of information saying the same thing about "vapor lock".

Hope that helps persons wondering.

 

[CTYankee]

Jeez, where do you live that people steal gas?? This isn’t 1973 when gas was not available to many.

I was going to say something snarky, but then I saw you're in Maine which makes all the difference. Now if you were from Boston or some other metropolitan area, OP's question would have made perfect sense.

 

[RLmesc]

The hybrid has a door lock, and the EB does not? How does that make sense? The EB owner will open it weekly and the hybrid monthly. Who is going to steal month old gas? Makes no sense, i want fresh gas dammit and when I start stealing the stuff after the apocalypse, I'll be looking for EB Mavs---- I mean Escapes or Bronco sports. LOL

 

[GPSMan]

a quote from https://www.carparts.com/blog/evaporative-emission-control-evap-system-101-the-basics/amp/

• When the conditions are correct, the control module closes the vent valve and opens the purge valve, creating a vacuum in the system.
• The control module then monitors the fuel tank pressure (FTP) sensor to verify the system can reach a specified amount of vacuum.
• If the vacuum is lower than specified, the module assumes there is a large leak somewhere in the system and stores a DTC in its memory

so, again, you are wrong in saying that cars do not use vacuum to check for evap leaks.

now, since I was curious and wanted to know why Mavericks use pressure instead of vacuum to test leaks, I did some reading. Everything I found stated that the pressure is to help preserve the fuel and many hybrids use this type of system. Since they use a positive pressure pump to pressurize the fuel system, that pressure can also be used to check for evap leaks. There are even some non hybrid vehicles that use a pressure system to test for leaks instead of using the vacuum from the ICE. There are actually 3 types of Evap test systems currently being used.

so the correct answer is, that is what Ford chose to use.

How do you define "high vacuum pressure"??

You nor car parts.com have defined this.

Some people believe high vacuum pressure to be negative 14 psi ( high being far from neutral ). Some define high as barely any ( high pressure absolute, close to neutral).

I think you are getting hung up on the word "vacuum". Yes, If I turn on a fan, the inlet side of the fan will have slightly lower pressure than the outlet side. Normal people in normal conversation don't call this "vacuum pressure".

In the gasoline tank, gasoline is going to make it's own +5psi to + 15psi from its own vapor pressure depending on blend and temperature.

In the quote you gave, the "vacuum" can be a simple matter of lowering the natural vapor pressure 1 or 2. It does not mean it is dipping below ambient. It's all relative.

 

[Bill K]

In Maine we take care of any thefts ( gasoline or others) in our own way. Everyone knows everyone, at least in our small towns. Except our big city of Portland. 140,00O people. Way Too big to know each other. I would never live there.
Mavericks are beginning to show up. I saw one like mine yesterday!

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