NAS D90 Fuel Capacity - Defender Source
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  #1  
Old June 9th, 2016, 05:46 PM
kelvinite
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Kelvin
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NAS D90 Fuel Capacity

I'm embarrassed to admit that I did something that I haven't done since I was a starving student and regularly pushed the limits by driving while low on fuel . . . I ran out of gas on the freeway.

After I filled the tank again, I've found that it only took about 13 gallons until full. I even overfilled slightly just to be sure the pump didn't cut off prematurely. Aren't our tanks supposed to be 15.6 gallons?
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  #2  
Old June 9th, 2016, 05:56 PM
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David Frank
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Yup. 15.6~60l

And don't do that again. It'll quickly kill your fuel pump. Ask me how I know ;-)

Squeezed this much in once. The following month I had to drop my tank to replace the pump. Total Pita.
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  #3  
Old June 9th, 2016, 06:28 PM
kelvinite
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Can anyone offer an explanation as to why I ran out of fuel at ~13 gallons?
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  #4  
Old June 9th, 2016, 06:35 PM
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Mark Bichin
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Only put 13 in :p. Seriously though is it possible that some water got into the tank?
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Old June 9th, 2016, 06:40 PM
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Chris deZ.
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Is it possible that a NAS 90, leaning to the passenger side, would have an air bubble in the top of the tank that would decrease capacity?
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  #6  
Old June 9th, 2016, 06:42 PM
kelvinite
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Quote:
Originally Posted by Arcadeus View Post
Only put 13 in :p. Seriously though is it possible that some water got into the tank?
That would mean that I have 2 gallons of water in the tank! Since water is denser than gasoline and the gas line pulls from the bottom of the tank, my truck wouldn't be running if I had that much water in the tank.
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  #7  
Old June 9th, 2016, 06:45 PM
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Mark Bichin
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Quote:
Originally Posted by kelvinite View Post
That would mean that I have 2 gallons of water in the tank! Since water is denser than gasoline and the gas line pulls from the bottom of the tank, my truck wouldn't be running if I had that much water in the tank.
That makes sense. To tell you the truth, I just wanted to give a plausible scenario after making a quick smartass comment. Failed 😞
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  #8  
Old June 9th, 2016, 07:09 PM
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Quote:
Originally Posted by doktorno View Post
Is it possible that a NAS 90, leaning to the passenger side, would have an air bubble in the top of the tank that would decrease capacity?
Yes, but that would be one heck of a pitched fuel stop. Any tank damage perhaps cause by a previous owner? Dents in the tank hidden by a replacement carrier?

I've only been able to squeeze an extra half to three quarters of a gallon doing the rock, roll and wait method to truly top off. Two and a half missing gallons is beyond weird. Maybe you found a VERY generous fuel pump and you got a full load while only paying for 13 gallons! Please tell me where it's located! ;-)
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  #9  
Old June 10th, 2016, 02:15 AM
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Do you typically run to near empty and fill-up almost alway only takes 13gal?
IIRC, I'm usually at 12 gal at a tick below 1/4 tank.

Is your gas gauge working? I typically fill up, reset the odo and watch that ticks to 180 - 190mi... then I fill up, regardless of what gauge reads. One of the 1st things I learned on SD - as my gas gauge sways left & right when truck is in motion.
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  #10  
Old June 10th, 2016, 02:36 AM
kelvinite
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Quote:
Originally Posted by lithium1330 View Post
Do you typically run to near empty and fill-up almost alway only takes 13gal?
IIRC, I'm usually at 12 gal at a tick below 1/4 tank.

Is your gas gauge working? I typically fill up, reset the odo and watch that ticks to 180 - 190mi... then I fill up, regardless of what gauge reads. One of the 1st things I learned on SD - as my gas gauge sways left & right when truck is in motion.
I do usually run the tank near empty but I don't rely on it too much since it's not working properly. The low is correct, but it only reads 3/4 full when the tank is actually full. I need to replace the sender/pump unit when I get a chance. I don't think that a faulty sender would cause my tank to have 2.6 gallons less capacity . . . or can it?

I've been predicting my truck's range based on my calculations of about 13mpg mixed freeway/city usage. I was at 168 miles when my car ran out of gas. Those numbers mean that I only had 13 gallons of gas in the tank. And my 13 gallon fill-up at the station corroborates that number.

The only thing I can think of is that one of the previous owners replaced the stock fuel tank with one of a lower capacity -- for more clearance, maybe?
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  #11  
Old June 10th, 2016, 03:07 AM
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Quote:
Originally Posted by kelvinite View Post
I do usually run the tank near empty but I don't rely on it too much since it's not working properly. The low is correct, but it only reads 3/4 full when the tank is actually full. I need to replace the sender/pump unit when I get a chance. I don't think that a faulty sender would cause my tank to have 2.6 gallons less capacity . . . or can it?

I've been predicting my truck's range based on my calculations of about 13mpg mixed freeway/city usage. I was at 168 miles when my car ran out of gas. Those numbers mean that I only had 13 gallons of gas in the tank. And my 13 gallon fill-up at the station corroborates that number.

The only thing I can think of is that one of the previous owners replaced the stock fuel tank with one of a lower capacity -- for more clearance, maybe?
Without dropping the tank this will be an unsolved mystery ... in the meantime consider one of these and cure gas anxiety.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #12  
Old June 10th, 2016, 08:54 AM
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  #13  
Old June 10th, 2016, 09:57 AM
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15.95 gallons is my PR. Will try to break 16 next fill-up.
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Old June 10th, 2016, 10:39 AM
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Originally Posted by down_shift View Post
15.95 is my PR. Will try to break 16 next fill-up.
I've hit 18mpg ...
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #15  
Old June 10th, 2016, 10:45 AM
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Originally Posted by leastonce View Post
I've hit 18mpg ...
All down hill?
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  #16  
Old June 10th, 2016, 10:52 AM
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I actually hit 20 once. The winds behind me were strong enough you could actually feel them pushing the 90.
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  #17  
Old June 10th, 2016, 11:11 AM
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I ran out once. In my own town. Generally will only run 120 miles or so between fill ups. Haven't ever seen 18 mpg and its been a while since I've seen 15.
On the flip side, my new DD is averaging 30.5mpg
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  #18  
Old June 10th, 2016, 11:16 AM
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Quote:
Originally Posted by D90Overkill View Post
All down hill?
on a long run ... i cant stress enough the value of timing up the engine on an oscilloscope!
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #19  
Old June 10th, 2016, 12:27 PM
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My guess is the gas station pump is miscalibrated and the station is ripping you off.
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  #20  
Old June 10th, 2016, 01:47 PM
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David
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Quote:
Originally Posted by lithium1330 View Post

Is your gas gauge working? I typically fill up, reset the odo and watch that ticks to 180 - 190mi... then I fill up, regardless of what gauge reads. One of the 1st things I learned on SD - as my gas gauge sways left & right when truck is in motion.
This, this right here. Is there anyone out there that actually has a working fuel gauge in their D90?

They aren't even all the same kind of inaccurate, on some the needle bounces but has a relative range of somewhat accuracy and that goes F to E. Yet on others its a complete guessing game where just a sticker of a fuel gauge might be more accurate.

As someone with mildly self diagnosed automotive OCD, this is extremely frustrating.

Eh, maybe I just need to grab a beer and throw a couple of fuel cans in the back.
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