Bad Mileage?

rangerboy101 · Nov 27, 2011

My 5.0 gets terrible mileage...I think. The other day I filled it up(according to the gas gauge) it only took $25(which is only like 7 gallons worth) and within driving ~20 miles, it's below half a tank. I'm really starting to think my gas gauge is wrong. I'm afraid to run it for very long when it hits E because I don't want to end up stranded somewhere. What do you guys think? The car runs pretty rich but there's no way it's burning up this much gas in such a short distance. And there's no way it only takes ~7 gallons of gas to fill it up. Thoughts? Ideas? Thanks in advance.

85_SS_302_Coupe · Nov 27, 2011

Sending unit is probably on its way out. It should hold more than 7 gallons.

1991notchbackLX · Nov 27, 2011

Change the plugs, wires, cap, rotor, fuel filter, flush the coolant and replace it, change the oil, and run a bottle of fuel injector cleaner through it. See if that helps, then figure out why you have a rich condition. Is your check engine light on? Do you have the stock emissions system in place, smog pump and all? Any information on the car at all other than it's a mystery Mustang?

5.0Droptop · Nov 27, 2011

its a 15 gallon tank so your sending unit is wrong.

Boosted92LX · Nov 27, 2011

Are they all 15? Most I've been able to cram in mine is about 12 1/2.

5.0Droptop · Nov 27, 2011

I just did a quick search on yahoo. Another mustang site had a similar thread about tank capacity and the general consensus was 15.1 gal.

5.0Droptop · Nov 27, 2011

1987 Ford Mustang GT LX

says 15.4 gal.

Boosted92LX · Nov 27, 2011

Good to know. I won't sweat it so much now when the needle hits "E".

rangerboy101 · Nov 27, 2011

1991notchbackLX said:
Change the plugs, wires, cap, rotor, fuel filter, flush the coolant and replace it, change the oil, and run a bottle of fuel injector cleaner through it. See if that helps, then figure out why you have a rich condition. Is your check engine light on? Do you have the stock emissions system in place, smog pump and all? Any information on the car at all other than it's a mystery Mustang?

Plugs, wires, and fluids are all good. I really just think it's my sending unit. I need to figure out the rich condition though.

Bad Mileage?

rangerboy101

Active Member

85_SS_302_Coupe

it sucks (I know) to be on the receiving end

1991notchbackLX

Active Member

5.0Droptop

...all those nights we shared, and you're a dude??

Boosted92LX

It's only an inch or two. What's the big deal?

5.0Droptop

...all those nights we shared, and you're a dude??

5.0Droptop

...all those nights we shared, and you're a dude??

Boosted92LX

It's only an inch or two. What's the big deal?

rangerboy101

Active Member

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Bad Mileage?

Active Member

it sucks (I know) to be on the receiving end

Active Member

...all those nights we shared, and you're a dude??

It's only an inch or two. What's the big deal?

...all those nights we shared, and you're a dude??

...all those nights we shared, and you're a dude??

It's only an inch or two. What's the big deal?

Active Member

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