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Unable to put gas in car due to the gas cap missing

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What am I missing? Go to the station and put some gas in the tank. Drive to the auto parts store and buy a cap. This may trigger a check engine light as the computer senses a fuel system leak. Some autoparts stores can read check engine codes, and can reset the light.

Posted on Nov 12, 2014


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$7EA9:A/T on Ford Fusion and $7E8: Engine The other day my gas cap not on or on tight enough went on but cleared once we removed & put it back on (gas cap).

it would have been activated by an EVAP sensor probably a p0442 code
leak detected small or large ===possible cause cap loose or missing

Jul 08, 2016 | Ford Cars & Trucks

1 Answer

What the gas cap stop this from starting

Missing gas cap will most likely result in a check engine light. Upon reinstalling the cap after many drive cycles the light will extinguish.

In no case will a missing gas cap disable the engine.

Dec 30, 2015 | Cars & Trucks

2 Answers

How to replace gas cap

Step 1 - Determine Your Type of Gas Cap Before acquiring a new one, think about whether you need a gas cap that locks to prevent a gas thief from stealing your gas. But keep in mind, if you put one of these caps on your car, your spouse or children who put gas in your car will need the gas cap key.
Step 2 - Remove the Cap Retention Ring When you actually replace your gas cap, you may need to remove a retention ring that keeps the cap attached to your car. If you do, you can remove it simply by using a pair of needle-nose pliers. Just slip one tip of those pliers under the ring edge; then close the pliers and pull the ring off the old cap and slip it over the new cap.
Step 3 - Check the Warning Sensor Light Your car may have a sensor light that will illuminate when you change your cap. If so, drive your car a few miles to see if the light goes off. If it doesn't, see your repair mechanic to fix the problem

Aug 17, 2015 | 2002 GMC Envoy

1 Answer

First engine light came on due to missing gas cap. put gas cap on and reset message. after filling up vehicle the engine startied became sluggish. took in and was told oygen sensor was a problem. r

next time take it to a accredited professional shop that will read the fault codes first before advising you on what has to be replaced and not just guessing the problem

Sep 09, 2017 | 2004 Mitsubishi Galant

1 Answer

Gas cap missing

The gas system is pressurized so you need a proper gas cap to allow pressure to build up and feed gas to your engine. Buy a replacement and put it on. The car should run fine.

Nov 19, 2013 | 1993 Buick Regal

1 Answer

My check gas cap light is on but no check engine light came on

The check gas cap light was in response to complaints of the check engine light being on for loose/missing gas caps. So now when the PCM sees a large EVAP leak the first thing it does is illuminate the check gas cap light (on models equipped with the light). Since it doesn't know if the gas cap is on or not it can have other issues like a vent solenoid stuck open which the PCM would be unable to distinguish between that and the gas cap left off.

There will still be a trouble code in the PCM for the EVAP system.

I’m happy to assist further over the phone at

Oct 05, 2010 | 2005 Buick LaCrosse

1 Answer

Service engine soon light stays on. The gas cap is very hard to take off and put on

The SES light will come on with a missing or defective gas cap. Try getting a new gas cap and installing to fix the problem.

Otherwise, have the SES light scanned to see what other problem may exist.

Hope this helps.

Jun 22, 2010 | 2000 Pontiac Grand Am GT

3 Answers

Would the gas cap being completely covered with ice after recent storm cause fuel flow problems. Turned and turned this am would't fire. this pm started fine, then noticed problem with gas cap when I went...

Yes in a cars fuel system ice can certainly cause problems. If the tank can not vent properly and ends up drawing a better vacuum than the fuel pump is capable of over coming due to fuel useage and the resulting vacuum created due to the drop in fuel level, then your car will just stop running due to fuel starvation. If there is a venting problem you would hear the air passing into your tank as your removed the cap. If anything it should be slightly pressurized vs having a vacuum in it.

Thanks for using FixYa!


Feb 23, 2010 | 2000 Ford Excursion

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