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  #1  
Old 08-16-2017, 05:36 PM
gdt gdt is offline
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Default "Check gas cap" light????

I have a 2002 ford ranger (4 cylinder) truck. The "check gas cap" light keeps coming on and when it does the truck runs very rough. I have changed the gas cap but it has not helped. Are there any ideas of what to do next?
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Old 08-17-2017, 03:45 AM
Jswifto Jswifto is offline
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Default

Look under the truck at the filler neck and see if it has a hole in it.
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Old 08-17-2017, 01:11 PM
ricochet ricochet is offline
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Default Re: "Check gas cap" light????

Most likely a problem with the evap system. The evap system is also connected to vacuum - a vacuum leak may also cause the rough idle. Google for the evap system for your year and take a close look at all the hoses. Could be the purge solenoid also - if all the hoses look ok, google for the tests for that.
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Old 08-17-2017, 03:36 PM
gdt gdt is offline
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Default Re: "Check gas cap" light????

thank for the tips I will do that this weekend
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Old 08-18-2017, 11:23 AM
pelicanman pelicanman is offline
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Default Re: "Check gas cap" light????

When my Gas cap light came on a few weeks ago,I went what-the ??
Had new cap on 3 weeks before.I thought my fuel filler neck was caput !!
I disconnected the battery,tighten the hell out of the cap,when i gas up.
Light has not come back on yet.But it's on the back of my mind,will it show up again ??
I think you have different problems on yours.Sorry i can't help you more.

old retired guy
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Old 08-18-2017, 11:49 AM
Mike69 Mike69 is offline
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Default Re: "Check gas cap" light????

Quote:
Originally Posted by pelicanman View Post
When my Gas cap light came on a few weeks ago,I went what-the ??
Had new cap on 3 weeks before.I thought my fuel filler neck was caput !!
I disconnected the battery,tighten the hell out of the cap,when i gas up.
Light has not come back on yet.But it's on the back of my mind,will it show up again ??
I think you have different problems on yours.Sorry i can't help you more.

old retired guy
Make sure you are turning off the engine when filling up with gas because the fuel system will not be pressurized & could cause it or the cap could have been loose.
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Old 10-03-2019, 08:49 PM
FordDogg FordDogg is offline
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Default Re: "Check gas cap" light????

I know that this is an old one, but I resurrected it and it helped me out a lot. I was chasing a P0442 check engine code, which is a small EVAP leak, for over a year. I changed the gas cap first thing, then changed the purge valve (the CVV) but none of those worked. Found this thread and got a filler neck from LMC and put it on. After not getting the light for about a month, I looked at the old filler tube.
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