Gas mileage
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Senior User
Joined: Jul 2002
Posts: 240
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From: stafford VA
Gas mileage
Well new problems occur and depleted funds. Can anyone please tell me if about 150miles/tank sounds about right. I have an '86XLT 2.9 auto and I dont know the size of the tank so if someone could help me on that too.
Any help at all is highly appreciated.
Tim
Any help at all is highly appreciated.
Tim
Senior User
Joined: Sep 2001
Posts: 118
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From: Bothell USA
Gas mileage
Um my dads BII got anyware from 275-325 on a tank and it had the 2.9 also. 150 for a tank dosn't sound right how much fuel do you put in after 150 maybe you have a bad fuel gage?
1979 F-150 4x4 351M C-6 NP205
2001 Ranger XL
1979 F-150 4x4 351M C-6 NP205
2001 Ranger XL
New User
Joined: Jun 2002
Posts: 16
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Gas mileage
ive got an 86 b2 xlt with 2.9 v6 and a 23 gallon tank, when i fill up ( on empty) i usually put in 15 gallons and my trip is at 366-386. i do alot of hiway driving so im getting pretty good mpg, id probably get better if i wasn't pulling a mountain.
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Senior User
Joined: Jul 2002
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From: stafford VA
Gas mileage
well every time i fill it up all the way....ans still get like 150 b4 it gets to the bottom but the gas light doesnt come on. I was thinking about running it completly out of gas to see if its just my gauge but ive heard EFI doesnt like being run dry because it will suck the things that accumulate in the tank. Any sugestions?
Postmaster
Joined: Dec 2001
Posts: 3,742
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From: UT
Gas mileage
EFI doesn't like to be run dry. The main reason is that the fuel pump motor uses the gas in the tank as a "coolant" to keep it from overheating. When you run the tank dry, you run the risk of burning your fuel pump up.
Next time you fill up, see how much gas it takes. Sometimes the floats on the sending unit get saturated or something with gasoline and don't float, so that's a good possibility.
As for my experience, I run ~22 mpg, mostly highway.
Next time you fill up, see how much gas it takes. Sometimes the floats on the sending unit get saturated or something with gasoline and don't float, so that's a good possibility.
As for my experience, I run ~22 mpg, mostly highway.
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Junior User
Joined: Oct 2002
Posts: 58
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From: Stewartstown,PA
Gas mileage
I have an 88 5 speed and get 23 mpg. I fill the 23 gal. tank and re-set the trip odometer. After I've gone about 250 miles the gas gauge needle is bottomed out. I keep going and fill it up at about 475 miles. Works for me.
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Post Fiend
Joined: Jun 2002
Posts: 13,873
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From: Atlanta GA
Gas mileage
> is there a way to check if my guage is wrong....
Yes, it requires removing the dash and grounding the gauge so it pegs all the way. The most likely problem is the sender in the fuel tank is bad, which is part of the $80 pump. Though there is no "kit" to fix them, you can repair them with parts from other Fords. Just takes a "real" parts guy and not a fiche reader.
Though by the time you remove your skid plate, tank straps, and drop the tank, you might as well replace the whole thing since sometimes you mess up the lock ring removing the pump.
You should get 15-18 mpg with a 2.9/auto/unlocked hubs and about 21 mpg with a 2.9/manual/unlocked hubs. I used my trip odometer and just filled whenever it got to 250 miles. That will leave you an eighty mile reserve.
If you can smell gas, your truck is not running right. Even without a cat. a BII exhaust is fairly clean. What I would do is look first for a gas leak! Make sure you do not have any rust holes on the bottom OR the top of your tank.
Yes, it requires removing the dash and grounding the gauge so it pegs all the way. The most likely problem is the sender in the fuel tank is bad, which is part of the $80 pump. Though there is no "kit" to fix them, you can repair them with parts from other Fords. Just takes a "real" parts guy and not a fiche reader.
Though by the time you remove your skid plate, tank straps, and drop the tank, you might as well replace the whole thing since sometimes you mess up the lock ring removing the pump.
You should get 15-18 mpg with a 2.9/auto/unlocked hubs and about 21 mpg with a 2.9/manual/unlocked hubs. I used my trip odometer and just filled whenever it got to 250 miles. That will leave you an eighty mile reserve.
If you can smell gas, your truck is not running right. Even without a cat. a BII exhaust is fairly clean. What I would do is look first for a gas leak! Make sure you do not have any rust holes on the bottom OR the top of your tank.
Senior User
Joined: Dec 2002
Posts: 290
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From: morristown usa
Gas mileage
i get 18mpg on my auto unlocked hubs. locking my hubs dont make a diff in gas for me. but check you air charge temp sensor it could be dirty. you o2 sensor could be dirty. porlly those to causing the bad milage. thats why i get such poor milage.