96 fzj780 fuel tank capacity?

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Noah, I was getting about 13-14 on average before any mods after some tuning and maint. After all the maint and upgrades I am averaging 12-13 with all conditions of driving over about 6 months of fill ups using the same station mostly. I attribute this to making a bigger brick to cut the wind, added hundreds of pounds of weight, higher rolling resistance with tires etc. many theories. The only way to determine milage is to use the same type of gas nossle/pump, not top off and record actual fill up and milage over a long period of time and averaging. The metering of gas is not exact and even has disclamers on them at the pump. Some claim to get more gas in the cold weather do to expansion of gas with heat etc. The point at which the pump shuts off is not the same for all applications and is dermined differently for each system (although it is regulated to some extent). When I was in college this was proposed in a transportation class and found to vary by as much as 12% either way using a 20 gal average tank, the bigger the tank the lower the margin of error if I remeber correctly. Either way anywere from 10-15 seems resonable from what other seem to have reported from short time I have been on the forums. MOst consider it lucky to have over 15 it seems.
 
Did the "range test" last summer .

250 miles when the light comes on solid (it ghosts in and out for a bit on level terrain)

286 miles sputter, sputter, pull over and put a can in.

all highway at between 1800-2200 RPM on gentle terrain (no long uphill grades).

Add 8% over-ground for tire size.

Truck weight 6393 lbs with a roof rack.
 
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25 gal? All this time I thought it was 20!

I go by how much I fill up though and I average about 13 mixed/mostly highway and thats with stock gears, 35s, bumpers, skid, LT MAF, and lots of hills driven on.



Running out of gas typically isn't too bad if you just leave it, the problem is when you try to keep running it, you will fry the pump or things could multiply like when I let a "friend" borrow my car. It was ran dry, then the (new) starter was cranked on until it died and apparently the alternator died too and the battery terminals were stripped by someone who didn't know what they were doing.

Now I'd rather let my vehicles just sit untouched when I'm gone for long periods of time.
 
sometimes it varies..... like when volume is determined by the location of the hole in the tank :D Then you just learn to fill up accordingly..... in my case about 25 bux at a time :hillbilly:

For all you overly OCD guys out there..... before and after. There was a surprising amount of rust from 220k miles of abrasion. But with some ambition for over the top PM, a wire brush and a lil spray on liner, you too could have a tank ready to outlast your rig (fingers crossed) Plus ive got the tank swap down to under 2 hrs now :lol:
gas tank 002.webp
bling 001.webp
 
Interesting picture, we can see the anti-sloshing wall inside the tank, for hard wheeling conditions I guess? Does that affect the gas available when the tank is nearly empty?
 
No affect on fuel availability near empty except w/ extreme angles. You can see the perforated baffle walls are suspended off the bottom of the tank and there is a feeder pipe approx 1/2'' in diameter through the bottom of that solid wall that surrounds the fuel pump assembly. The pump assy. sits inside the box, and the float level sits outside the box. The rest of the tank has several baffles as well (seen in pic w/ dimple cuts) to control sloshing. heres a closer pic of the baffles and the "thru" pipe into the pump well.
bling 002.webp
 
solidfrontaxle said:
Technically speaking, what is bad about it? Obviously it leaves you stranded, but does it mess up your fuel system? Make it hard to start again? I've always wondered.
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Running around all the time with a low fuel level is not the best idea.

The fuel pump is cooled by the fuel in the tank. A very low fuel level exposes more of the pump and habitual operation with the pump uncovered is not good for the pump.
 
1973Guppie said:
as the title reads, what is the total fuel capacity on this vehicle? could not find it in my crappy haynes manual. Trying to figure out the mileage I get. I get about 315 miles from a full tank overall.
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That's no way to get accurate fuel mileage data. Why would you divide miles driven by tank size rather than just dividing by the amount of fuel required to fill the tank back up? :confused:

Oh, and gas tank capacity is listed in the owner's manual. ;p

Curtis
 
which is actually 25.3 gallons. :lol:
 
My fsm says that the 91-92's are 25gallons as well. Is this correct?
I usullay fill up at about 225 miles. I've never seen my fuel light come on before. Maybe I should do the "run til empty" test to see how many miles I really get on a full tank.:cool:
For all I know, who know is my fuel light works or not. If I could get 300 miles, I'd be a happy camper. I average 12 miles to a gallon.
 
Imperial gallons?

:lol:
 
CJF said:
That's no way to get accurate fuel mileage data.
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I am completely baffled by the huge number of posts in this thread and the fact that nobody seems to be able to do a proper calculation of MPG. I believe this thread is worse than the one where the guy was calculating his MPG by driving a certain number of miles (100 miles) and then pumping gas and estimating how much fuel he used in the prior trip based on his guess of how much fuel was in the tank. His method was bizarre to say the least. (Maybe I'll try to find that old thread. :D)

MPG is never accurate when computed on a 1-time basis. You should average over a month or 5 fill-ups or something. Dan has a rolling average based on the past 16 years and 150,000 miles. Now that is an accurate MPG!

-B-
 
161,116 miles actually................:lol:
 
CJF said:
That's no way to get accurate fuel mileage data. Why would you divide miles driven by tank size rather than just dividing by the amount of fuel required to fill the tank back up? :confused:

Oh, and gas tank capacity is listed in the owner's manual. ;p

Curtis
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because I get an average of about 315 miles everytime my light turns on, and I can't remember how much fuel went in my tank everytime. I was just trying to get an idea of my fuel mileage.

god, you 80 guys really overthink all this s***.

:)
 
Any dumbass can accurately calculate fuel mileage by starting with a full tank and a re-set trip meter. When refilling the tank and recording the ammount of fuel required to refill it, divide the numer of miles traveled by the ammount of fuel pumped and you have your answer...........
 
cruiserdan said:
Any dumbass can accurately calculate fuel mileage by starting with a full tank and a re-set trip meter. When refilling the tank and recording the ammount of fuel required to refill it, divide the numer of miles traveled by the ammount of fuel pumped and you have your answer...........
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X2 i've been writing the mileage on the gas reciept since I got the truck, averages about 15-17 depending on my driving style, or whether or not I have my rack on etc. I think its a good habit, that way if you see a drastic change you know you have a problem
I just went up to 33s and it looks like I may be getting 1 mpg less but I have to run some more tanks just to be sure
 
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