Isuzu MU-X long range fuel tank ,gauge

Submitted: Wednesday, Nov 25, 2015 at 09:12
ThreadID: 130975 Views:7779 Replies:8 FollowUps:3
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Hi All I have just had a 120 litre long range fuel tank fitted to my vehicle. Prior to fitting the installer told me that until the tank was 50% empty the gauge would show full then after that the gauge would show an approximate reading in regards to the actual contents.
On using 70 litres the gauge shows nearly empty .Before I return to the installer I would like to know if the cure is simply bending the fuel float downwards ( by the installer ) or some thing else .Any info would be greatly appreciated ,thank you ,Brian
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Reply By: Member - mechpete - Wednesday, Nov 25, 2015 at 13:38

Wednesday, Nov 25, 2015 at 13:38
my experience with long range tanks was the manufacturer of the tank includes instructions
on how to bent the float arm ,but it is only a rough indication of how much fuel in the tank
it will be by no means accurate . the 145lt in my patrol took 250ks before the gauge started to move ,
AnswerID: 593111

Follow Up By: Member - Rod N (QLD) - Wednesday, Nov 25, 2015 at 14:20

Wednesday, Nov 25, 2015 at 14:20
As I said in the other forum you posted in, the 130lt in my D-Max takes 300kms before the gauge starts to move ,
FollowupID: 861315

Reply By: Bob Y. - Qld - Wednesday, Nov 25, 2015 at 14:25

Wednesday, Nov 25, 2015 at 14:25

I've been driving a Hilux dual cab ute lately, that has a 140L tank fitted. It stays on full until it has clocked up over 450kms, and then starts to drop to half and below. From my observations, full to half gives about another 250kms, and about the same from half to empty. For the trip we do, about 720kms, it uses about 100L, which shows about half on the gauge.

Used to have an 80 series fitted with an aftermarket rear tank, and it would do up to 600kms before the gauge would drop off full.

From what I understand, it is as you say, the arm needs to be bent downwards, to get a more accurate reading. Feel it would be very much a trial and error task, and you're unlikely to obtain a highly accurate result. :-(. Think the Longranger website might have a pdf. file that's shows the approximate angles on the float arm, for an "accurate" full reading.

Your current fuel gauge would be a bit disconcerting Brian! Imagine having the needle bouncing on empty, but knowing you still had 30-40L of usable fuel in the wonder you want it corrected.

Couple of weeks ago, I had a worrying occurrence in the above Hilux. The owner of the ute had fuelled it(or so he thought) and I headed off on the trip(a mail run down the Diamantina River) After about 300 kms or so, the needle had started to creep off full, which had me a bit concerned. Then at the usual point where the needle started to drop, I had just over half a tank left. Touch and go, and some reduced speeds, I got back to town with, he said, 7L left in the tank. Needless to say the ute is fuelled up with more care now. :-)


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AnswerID: 593112

Follow Up By: Member - Wildmax - Wednesday, Nov 25, 2015 at 18:17

Wednesday, Nov 25, 2015 at 18:17
Yep, I've also got a 140 litre long ranger tank in my Hilux, and get a similar result - shows full until I've done around 300km, and then gradually works down through the gauge. I re-set the trip meter when I fill up and know that I need to leave a bit of room for error once I get towards 1000km (usually get around 14 litres per 100km when towing the trailer).
FollowupID: 861321

Reply By: Sigmund - Wednesday, Nov 25, 2015 at 14:38

Wednesday, Nov 25, 2015 at 14:38
The AutoXtras tank is fitted to my MU-X (the firm was recently bought by ARB). This has 112 l total and 110 usable.
When full it takes some time before the gauge shows any drop, and then when it's showing half, 55 l has been burned up. I haven't checked the actual against the indicated for other levels.
AnswerID: 593113

Reply By: brianH - Wednesday, Nov 25, 2015 at 16:52

Wednesday, Nov 25, 2015 at 16:52
mechpete ,Rod , Bob , Sigmund thanks very much for your replies regards , Brian
AnswerID: 593119

Reply By: Geoff K4 - Wednesday, Nov 25, 2015 at 17:07

Wednesday, Nov 25, 2015 at 17:07
Had a long range tank fitted to my D-max by the local ARB dealer, they altered the float so now it acts as a normal fuel tank gauge as before. Your installer may have forgotten this step.
AnswerID: 593120

Reply By: TomH - Wednesday, Nov 25, 2015 at 18:15

Wednesday, Nov 25, 2015 at 18:15
I put a longranger tank in a Patrol and just bent the float arm and it worked ok I never let my tanks run right down so it was Ok. I sold it to a dealer who sold it without telling the buyer about the tank.

He rang me up in great consternation when it cost him nearly $200 to fill what was supposed to be a 36 litre tank ROFL
AnswerID: 593121

Reply By: brianH - Wednesday, Nov 25, 2015 at 21:31

Wednesday, Nov 25, 2015 at 21:31
Thank you Geoff and Tom, regards, Brian
AnswerID: 593127

Reply By: Isuzumu - Friday, Nov 27, 2015 at 11:23

Friday, Nov 27, 2015 at 11:23
I fitted a Scanguage after putting a long range tank in our D.Max and now know at any time how many litres of fuel I have in the tank, as well as monitoring the auto trans temperature.
AnswerID: 593187

Follow Up By: brianH - Friday, Nov 27, 2015 at 19:14

Friday, Nov 27, 2015 at 19:14
Thank you Bruce for the info,regards, Brian
FollowupID: 861388

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