Long Range Fuel Tank 30 gallons ordered [ADMIN WARNING: NO POLITICS]

[swamp2]

Only a 3:30 am post... not a problem.

Hmmm, 11:30 p.m., PST, on a weekend. And who cares if it is 3:30 a.m. I wasn't aware the forum had hours...

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[swamp2]

Very good pics @rayofsi , thanks. That said, I'm not able to determine if there is or isn't a loss of ground clearance.

 

[rayofsi]

I'm going to lose my exhaust before my gas tank gets hit lol .

 

[DuneRunner]

Thank you for bringing us along. This has been very informative. A couple of questions

1.) Can you let us know if this behaves differently at the fuel pump? I know that the S&B extended tanks won't fuel as quickly as the stock tank, which can be a painful wait at the pump.

2.) After you have had some time, can you let us know if you would do it again?

 

[IwannaGOfast]

Hmmm, 11:30 p.m., PST, on a weekend. And who cares if it is 3:30 a.m. I wasn't aware the forum had hours...

3 hour time zone time difference plus daylight savings!!

 

[rayofsi]

Thank you for bringing us along. This has been very informative. A couple of questions

1.) Can you let us know if this behaves differently at the fuel pump? I know that the S&B extended tanks won't fuel as quickly as the stock tank, which can be a painful wait at the pump.

2.) After you have had some time, can you let us know if you would do it again?

No issues. Fills normally at the station. Stops normally when full. . Will keep up in this thread. Hoping for someone to figure out magic on dte calculations lol

 

[swamp2]

I DONT KNOW WHY YOU SAY FORSCAN CANT DO THIS???

heres proof...took all of 5 min.

Just like many other four scan changes.You also have to do an additional change...

FUEL LEVEL SOURCE BY IPC NOT PCM.

Open mouth, insert foot...

 

[swamp2]

I could be totally wrong, but I'd suspect the range estimate will not be accurate going forward. The new tank is complex geometry. Even if the computer recognizes the new tank fuel capacity, I wouldn't be surprised if when the fuel level float is displaced some distance (say a change from 1/2 to 1/4 tank level) that total fuel volume per unit of gage travel represented in the OEM tank will not be the same number of gallons capacity in the new tank. More significant, If there is still 4 or 5 gallons remaining when the gage is showing nearly bone dry E, there is no hope that range calculation can be accurate without changes to the fuel level sensor.

I don't think it will be nearly as bad as you describe.

Although more complex in shape than factory, it is not terribly so. It's still, more or less, a rectangular prism. All tanks, factory or aftermarket have deviations (positive or negative bumps above a straight line - i.e. non-lineariities) in their volume vs. sender height curves. Probably calibrations via look up tables are not even implemented for all modern vehicles and many years ago, no vehicles had such.

So although if there is no DTE correction the DTE is likely to be off by about 50% (amount need tank is larger than factory), I don't expect the fuel level gauge to be off in any meaningful way. Some of the non-lineariities will be worse, but some will also cancel based on the factory tables/curves. Even if the random probabilities all stacked up against you, unfavorably, they just won't ruin the basic linear part of the existing behavior.

Of course this point of view does assume that either the new tank depth at the float is close to factory depth or that the float can accommodate a slightly altered depth and total travel.

 

[rayofsi]

I don't think it will be nearly as bad as you describe.

Although more complex in shape than factory, it is not terribly so. It's still, more or less, a rectangular prism. All tanks, factory or aftermarket have deviations (positive or negative bumps above a straight line - i.e. non-lineariities) in their volume vs. sender height curves. Probably calibrations via look up tables are not even implemented for all modern vehicles and many years ago, no vehicles had such.

So although if there is no DTE correction the DTE is likely to be off by about 50% (amount need tank is larger than factory), I don't expect the fuel level gauge to be off in any meaningful way. Some of the non-lineariities will be worse, but some will also cancel based on the factory tables/curves. Even if the random probabilities all stacked up against you, unfavorably, they just won't ruin the basic linear part of the existing behavior.

Of course this point of view does assume that either the new tank depth at the float is close to factory depth or that the float can accommodate a slightly altered depth and total travel.

initial findings so far. Tank read full for my first 70 ish miles. so 6 gallons or so for me.. I get crap mpg. next test for me... going to drive this until 50 miles warning to fill up.

 

[ThunderFlash]

I don't think it will be nearly as bad as you describe.

Didn't mean to sound doom and gloom or anything, just more about being cautionary. Sounds like OP used 6 gallons getting off full, which isn't horrible. The new tank appears deeper in the mid section, though, and I believe that's were the float lives. The float may reach the end of its travel or maybe start throwing "out of range" data. I guess we will all find out when the trail blazing OP fills her up with 50 miles range to go....which at 11 or so mpg, it shouldn't take long!

 

[rayofsi]

i know some have the tank on the way. i think it'll be a good idea to measure the tank bottom plate thickness. during the install. i kept having some questions, like there is no way the bottom is only 5mm... it definitely looks and feels like 3mm+ 5mm welded on.. But i had a schedule to work on that day and didn't stray from just doing the install.

 

[swamp2]

initial findings so far. Tank read full for my first 70 ish miles. so 6 gallons or so for me.

Not a good sign. Sounds like the float doesn't meet the requirements I mentioned above. Not a deal breaker, but unfortunate.

 

[ThunderFlash]

Not a good sign. Sounds like the float doesn't meet the requirements I mentioned above. Not a deal breaker, but unfortunate.

@rayofsi, I suppose after you have it figured out how much fuel/range is left, you can just reset one of the trips and use that as a count down if there is an appreciable amount of fuel left beyond 5 or so gallons @ an indicated 50 miles to empty. Might be tricky if you have a mix of on and off road driving going on. Dang, if you're getting 11-12 mpg on the road, what are you getting on trails, like 4 or 5 mpg?

 

[BigMeatsBronco]

So there may be a workaround on this by using a F150 sending unit...as the f150 tank is much deeper and the little float arm is longer than broncos... I had to change to the bronco float arm.Because the f150 was too long for the tank to work... (engine swap)

 

[rayofsi]

Updates. Got down to 20 miles on instrument cluster, fordpass app showed 10% and 22mi
filled up 26.482 gallons. so 3.5 or 3.6 gallons left when at 20/22 miles left on my range, i average 13.5mpg supposedly. keeping track of miles this time with screenshots and pics, so i have a better idea.
max range still at about 250 for me on the instrument cluster, which indicated 12.5 mpg.

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