Ran out of gas. - Vintage Mustang Forums

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post #1 of 17 (permalink) Old 04-21-2017, 12:35 PM Thread Starter
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Ran out of gas.

So I was trying to run my car down to less then 5 gallons since I have to replace the Fuel sending unit which is on its way here. I have a 67 Stang with the 16 gallon tank. I figured I would be getting at least 12-15mi/gal so around 192mi to the tank or more. But nope ran out of gas at 156mi from last fill to the top, so 9.75mi/gal. Should I be worried about gas mileage? I have a 289, 4v Edelbrock Performer intake, 600cfm Carter carb, Mild cam and a C-4 with 2.79 rear gears. I do mostly city driving not freeway. I read some past posts and people are getting 20mi/gal or more. I do feel my carb is running way too rich but wanted to get your folks thought.
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post #2 of 17 (permalink) Old 04-21-2017, 12:46 PM
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What do your plugs look like?

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post #3 of 17 (permalink) Old 04-21-2017, 01:02 PM
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Possible gas leak somewhere ??

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post #4 of 17 (permalink) Old 04-21-2017, 01:22 PM Thread Starter
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Here is number 5 plug, number 1 looks the same. I have never seen a leak but possible.
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post #5 of 17 (permalink) Old 04-21-2017, 01:28 PM Thread Starter
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Hmm picture is right side up but when I attached it, it put it sideways. Weird.
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post #6 of 17 (permalink) Old 04-21-2017, 02:02 PM
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The dark black ring at the base indicates that it is running just a little too rich. The strap looks a little rough. Possibly old plugs or bad ignition. The porcelain should be a light tan or light gray.

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Last edited by 69GT350H; 04-21-2017 at 02:07 PM. Reason: Strap not as bad upon 2nd look.
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post #7 of 17 (permalink) Old 04-21-2017, 02:03 PM
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city driving=stop&go
mild cam=less mpg
C4=fewer mpg
2.79 rear = sluggish so you gas it more just to feel normal.
Idling even while coasting adds up

Did you slosh the tank and make sure it picked up 98% of the gas?
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post #8 of 17 (permalink) Old 04-21-2017, 02:07 PM
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Maybe full is not really full.

331 solid flat cam, rings and bearings break in run up.
https://www.youtube.com/watch?v=3MNjb-AiWec

331 break in complete and is waiting on me to finish the body work
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One of the last tnt's on my 289 may she rest in pieces. It ran in the
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post #9 of 17 (permalink) Old 04-21-2017, 02:30 PM
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Quote:
Originally Posted by my289 View Post
Here is number 5 plug, number 1 looks the same. I have never seen a leak but possible.
Is the car kept in a garage ? If so, there will usually be at least a slight gas smell if not a strong one when there's a leak present.

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post #10 of 17 (permalink) Old 04-21-2017, 02:44 PM Thread Starter
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Thanks guys. So to answer some of the questions. The plugs are about 3 years old. They are the Bosch Platinum DR8BPX, I usually only put 1-2k miles per year so at the most maybe 6k miles on the plugs. I can't find where I wrote down when I replaced them which I usually do. Ill check the tank once I get the sending unit to see how much gas was left but banging on it sounds pretty empty. It is garage kept, no smell of gas in there only when I turn it on smells a little rich. I did tune the carb idle screws to get the most vacuum which was about 12 last year. Timing is at 12 base, not sure if that matters.
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post #11 of 17 (permalink) Old 04-21-2017, 03:35 PM
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Quote:
Originally Posted by 69GT350H View Post
The dark black ring at the base indicates that it is running just a little too rich. The strap looks a little rough. Possibly old plugs or bad ignition. The porcelain should be a light tan or light gray.
You might need to do a jet change, but running a little rich is better than running lean.

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post #12 of 17 (permalink) Old 04-21-2017, 03:44 PM
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Mostly city driving, eh?
So how much does
your right foot weigh?
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post #13 of 17 (permalink) Old 04-21-2017, 03:50 PM
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+1^^ I usually worry about my 'tire mileage' before my gas mileage! lol

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post #14 of 17 (permalink) Old 04-21-2017, 04:51 PM
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Your gas mileage sounds a bit right for me, especially since you might be running a tad rich (better than a tad lean) and do mostly city driving. Don't worry about it at all.

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post #15 of 17 (permalink) Old 04-21-2017, 05:07 PM Thread Starter
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Ok. Yeah I do have a heavy foot. My wife and kids say I drive too fast and I don't drive the 67 any differently then my other cars. Just wasn't sure if the 10mi/gallon was a cause for concern or not. I read some past posts about the Copper Autolite plugs being easier on the Ignition system. So maybe Ill go back to stock plugs to see if that helps and I can try a jet change to a leaner setting.
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