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5.0L General Discussion This section is for non-tech specific information pertaining to 5.0L Mustangs.

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Old 04-07-2010, 11:44 PM   #1
Join Date: Mar 2010
Vehicle: 87 mustang coupe
Location: illinois
Posts: 9
Default 88 5.0 Carb getting horrible gas mileage!!!!

Hey guys I just built an 88 coupe 5.0 HO with a 600 Carb, I'm getting about 8 miles to the gallon, there for I can go about 100 miles on a tank. WTF is the problem, there doesnt seem like this is right at all. My gas gauge doesnt work correctly, when I fill it up, the gauge goes up, I know when it is almost empty because the gauge goes all the way down, could my gauge maybe finally went all the way out? Also my timing is a little off just havent had it adjusted yet, could this be eating all of my gas? Any help would be greatly appreciated, also can anyone else tell me what you are getting to a gallon with the similar setup? Thanks
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Old 04-08-2010, 11:45 AM   #2
Join Date: Mar 2010
Vehicle: 87 mustang coupe
Location: illinois
Posts: 9

Hey guys thanks for all the help! Can anyone at least tell me what mpg you are getting with the similar setup?
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Old 04-08-2010, 02:17 PM   #3
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Vehicle: 67 Mustang Coupe
Location: California
Posts: 10,391

Something is wrong. Either the gauge and/or sender are shot, you have a fuel leak, or you're jetted WAY rich.

My little 302 is not stock and I'm getting about 25 highway.
Who cares how much horsepower it has, all that matters is how fast it goes!

Untested 331, lots of suspension, chewing up corners.
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Old 04-08-2010, 02:59 PM   #4
Join Date: Mar 2010
Vehicle: 87 mustang coupe
Location: illinois
Posts: 9

thanks for the response, I will look into the things you mentioned. I don't think that there is anyway possible that this is right....
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Old 04-08-2010, 03:17 PM   #5
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Vehicle: 1991 Ford Mustang
Location: Pittsburgh
Posts: 2,459

Check tire pressure. It can rob you of a few mph if it's too low.
"Research is what I'm doing when I don't know what I'm doing".
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Old 04-09-2010, 01:34 PM   #6
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Join Date: Jan 2007
Vehicle: 93 Mustang LX
Posts: 1,996

A few things you must confirm first. Is the odometer reading correctly and how many gallons to drive a certain distance.

Personally I know when I screw together a new combination. I'm getting about half the mileage, just due to the grin factor.

Mileage should not even be measured unless you are driving to get maximum mileage. So if you take the car for a 10 mile cruise and run it WOT through the gears a couple times. your average MPG takes such a dump, it's not even worth measuring against.

On carbed applications. Some easy things to check are for blown power valves and you should run vacuum advance on the distributor.
65 Belevedere
69 Super Bee
87 Ram
93 Mustang
00 Park Avenue

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Old 04-09-2010, 01:34 PM
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