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Old 05-23-2011, 02:06 AM   #1
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Symptoms of a bad gas-cap?

Can someone enlighten me, I think my cap in the maro is shot. When I unscrew it alot of fuel vapor comes out with some pressure behind it, and it takes forever for it to start. Everything else is good however. A couple people told me to drill a hole in it, but id rather just buy a new one if thats the problem.
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Old 05-23-2011, 02:22 AM   #2
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Quote:
Originally Posted by FL!nn3R View Post
Can someone enlighten me, I think my cap in the maro is shot. When I unscrew it alot of fuel vapor comes out with some pressure behind it, and it takes forever for it to start. Everything else is good however. A couple people told me to drill a hole in it, but id rather just buy a new one if thats the problem.
Taking forever to start has nothing to do with your cap, as you can start the car with the cap off. As for the problem with starting the car, it could be a number of things (I would first check the battery to make sure all connections are secured). Are you priming the fuel system before you start your car?

As for drilling a hole, I wouldn't personally, I would just spend the $15-20 and get a "self ventilating cap" or whatever the technical name is for it.

As for the pressure and fumes, both my 3.4 and 5.7 have always done it so I just assume it's normal. I could be wrong but I've never had any problems arise from it. I would say it's normal as the gas is being vacuumed out of the gas tank, it leaves pressure build up. But if it bothers you, like I said, think about getting one of the caps that vents the pressure.
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Old 05-23-2011, 04:07 AM   #3
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I've noticed the sucking air on every vehicle I've refueled. you've got 15 gallons of liquid that needs replaced, so it draws an epic vacuum.
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Old 05-23-2011, 07:49 AM   #4
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If you drill a hole in the cap you will get a SES light.
There is pressure in there for a reason. Leave it alone.
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Old 05-23-2011, 10:22 AM   #5
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Pressure lol buddy that is normal. You need that pressure. That is from your fuel pump sucking. For the smell of fuel it is relieving pressure so the smell will shoot out from the tank. Like what Navyvet said leave it alone. If you drill a hole in your cap you will cause problems with your fuel pressure.
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Old 05-23-2011, 11:28 AM   #6
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Ok I wasnt planning on drilling the hole, I just wondered why you would do that. Sometimes I can turn my key and it will fire on 2 cranks, but usually it takes a few so i usually just prime it twice the start it.
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Old 05-23-2011, 11:48 AM   #7
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Quote:
Originally Posted by 95 Firebird View Post
Pressure lol buddy that is normal. You need that pressure. That is from your fuel pump sucking. For the smell of fuel it is relieving pressure so the smell will shoot out from the tank. Like what Navyvet said leave it alone. If you drill a hole in your cap you will cause problems with your fuel pressure.
Has nothing to do with fuel pressure, it has to do with emissions
and keeping the gas fumes in the tank
If the PCM doesn't detect 1 psi in the fuel tank it sets a SES light,
because it assumes the cap is loose or there's a leak.
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Old 05-23-2011, 12:08 PM   #8
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Thanks for the info. kinda off topic but has to deal with the fuel tank. Why at gas stations when you put the gas nozzle in the tank it does lockup and you have to hold it in place to fill it up.
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Old 05-23-2011, 12:56 PM   #9
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Quote:
Originally Posted by 95 Firebird View Post
Thanks for the info. kinda off topic but has to deal with the fuel tank. Why at gas stations when you put the gas nozzle in the tank it does lockup and you have to hold it in place to fill it up.
Gas nozzle is too sensitive to back pressure.
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Old 05-23-2011, 01:29 PM   #10
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Is that to all the 4th gens
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Old 05-23-2011, 01:32 PM   #11
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Quote:
Originally Posted by 95 Firebird View Post
Is that to all the 4th gens
Occasionally when filling mine the nozzle will shut off.
Depends on the nozzle.
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Old 05-23-2011, 01:36 PM   #12
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Quote:
Originally Posted by NavyVet View Post
Occasionally when filling mine the nozzle will shut off.
Depends on the nozzle.
I have this happen every now and then as well, sometimes just taking it out and resetting it in there fixes it for me. Sometimes the nozzles sit too far in there or something, my work vans do the same thing.
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Old 05-23-2011, 01:44 PM   #13
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The air that the gas is pushing out is trying to escape through the same pipe the gas is going in, so......?
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Old 05-23-2011, 01:53 PM   #14
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Quote:
Originally Posted by FL!nn3R View Post
Ok I wasnt planning on drilling the hole, I just wondered why you would do that. Sometimes I can turn my key and it will fire on 2 cranks, but usually it takes a few so i usually just prime it twice the start it.
Fuel pump. My 3.8 did that. some occasions it'd fire right up. otherwise id have to prime the pump. i have videos of it actually. Probably a thread on it somewhere.
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Old 05-23-2011, 03:22 PM   #15
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Quote:
Originally Posted by 95 Firebird View Post
Is that to all the 4th gens
My 2KTA does it all the time, I have to fill my tank with the gas nozzle half hanging out, which isn't a biggie for me. It still clicks off when it's full.
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