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Car dies after driving about 1/2 hour
#1
This problem just started within the last month or so. The car starts normal and runs and drives great for about a half hour, then just quits like its running  out of gas. The charging system is good and I have a quarter tank of good gas indicated. After sitting for a while it starts right back up and drives normally again. I thought maybe vapor lock because it's been hot here and I also changed the fuel filter as cheap insurance. This just happened again yesterday at a pretty busy intersection, and if it weren't for my son-in-law, and the nicest young cop I've ever met, it could have been worse. I'm going to have the battery load tested, but I don't think it's an electrical problem. I am leaning towards the fuel pump. What do you guys think?
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#2
When it happens go to the gas cap and remove it. If you hear a sucking sound the vent in the cap is plugged and as the gas is pumped out of the tank no air is getting in. When the vacuum gets to a point the fuel pump can no longer pull gas to the engine. Just one idea.


When a man is in the woods and talks and no women are there is he still wrong??
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David
[+] 1 user Likes Carolina_Mountain_Mustangs's post
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#3
(08-12-2018, 11:08 AM)Carolina_Mountain_Mustangs Wrote: When it happens go to the gas cap and remove it. If you hear a sucking sound the vent in the cap is plugged and as the gas is pumped out of the tank no air is getting in. When the vacuum gets to a point the fuel pump can no longer pull gas to the engine. Just one idea.

Thanks ,I'll try that today.
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#4
I agree with David, gas tank venting is most likely the problem. The line up to the charcoal canister or the canister may be plugged, if you're still using them, if not you need a vented gas cap, which may be plugged. I've actually seen gas tanks collapse due to lack of proper venting.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#5
When mine did this it was a bad coil.
It would run great, then the coil would overheat, die, cool off, run, overheat, die, repeat....

Bob

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#6
runninpony 
That happened to me too due to a crack in the coil, replaced the coil and all was good!

71-73 Mustangs never die, they just go faster!
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#7
(08-12-2018, 12:37 PM)TheRktmn Wrote: When mine did this it was a bad coil.
It would run great, then the coil would overheat, die, cool off, run, overheat, die, repeat....

Same thing happened to me.  It all depended on ambient air temps and how long it took the coil to get warm enough to quit.

Extremely frustrating since it acted like it running out of fuel......
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#8
Ditto on the bad coil. I worked on my carbs for 2 years, before I replaced the coil.
Thick headed I guess....
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#9
(08-12-2018, 11:34 AM)Don C Wrote: I agree with David, gas tank venting is most likely the problem. The line up to the charcoal canister or the canister may be plugged, if you're still using them, if not you need a vented gas cap, which may be plugged. I've actually seen gas tanks collapse due to lack of proper venting.

Tried that and no help. No sound from the tank when cap removed and no start even after cap was off for a while.
I have had the canister removed and the line plugged for years and this started a month ago....Thanks for the tip anyway...……….
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#10
Coil or condenser, then. Unless you have an aftermarket electronic ignition, then that may be it, too.

Just for the heck of it I would probably check the fuel pressure and quantity when it's hot and has quit.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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