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Finally worked my way down to "0 miles" on this transition tank on Friday and had to fill up yesterday.

Given that the 40 gallon fill is going to be significantly more than the 26 gallon fill in the standard factory tank and that I have to deal with most gas stations $100 automatic shut-off on credit card purchases, I decided to look for the best price for fuel in lieu of my closest Mobil station. Kinda baffled by the wide spread in diesel fuel price is my area -- from a low of $2.87/gal to a high of $3.59/gal according to GasBuddy, but given this info, I found a Valero station not too far out of my way that had diesel for $2.89/gal for cash or credit.

Before I pumped any fuel, I added an 8 oz. bottle of both Stanadyne Performance Formula (covers 25 gallons) and Stanadyne Lubricity Formula (covers 15 gallons) At the $2.89/gal price for diesel, I managed to get just under 34.5 gallons before I hit the automatic shut-off limit, so didn't fill the 40 gallon tank quite 100% full but pretty close, which resulted in 894 DTE miles (screen capture below) on the IPC. If I started the pump again or could find a better price for diesel, I should be able to get over 900 miles for DTE with the Titan XXL 40 gallon replacement tank for F150s w/5.5' bed. With these ranges, I am under the 999 max mile limit that @kdjasper mentioned earlier in this thread.

I had some unexpected highway mileage due to having to travel home for a funeral this past Monday, so I think without any unexpected trips, I should be close to a fill-up once/month = pretty cool in my book! Although the diesel fuel economy is ~20-25% better than my 2015 F150 Platinum 5.0L V8, it sure feels like I visit the gas station a lot less now with the 2018 F150 PS 3.0L V6 Diesel, and I am spending a lot less at the pump. At once/month fill-ups, my case of 24 bottles Stanadyne Performance Formula and case of 24 bottles of Stanadyne Lubricity Formula should last ~2 years.

If anyone has any questions with either of the Titan tank replacement options, @justlucky and I have recently installed the 40 gallon tank for the 5.5' bed and @kdjasper installed his 48 gallon tank on his KingRanch w/6.5' bed about 6 months ago.
 

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One thing I have noticed with my 48-gallon Titan replacement tank is that it takes a long time for the fuel gauge to move off of Full, and it also drops fairly quickly when under 1/4 tank. I would be curious if those with the 40-gallon Titan have a similar experience. What I am saying is that it will not match your steady declining fuel gauge experience as you had with the OEM tank.

I have found that if I re-fuel around the 1/4 tank mark that I can fill up at ~$3/gallon and not hit the $125 credit card pump limit. I also read somewhere a while back that it is a best practice/habit to re-fuel diesels at the 1/4 tank remaining mark. There have been multiple times now where I have hit the $125 limit, hung the pump back up, started a new transaction, only to get less than 2 additional gallons in the tank.

I can say that I do absolutely love the DTE range with the Titan.
 

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So far I am happy with the new tank. I cannot wait till I amon the road to Pennsylvania, a 715 mile trip, and I will not have to ride offthe interstate to fuel up the entire way. I also like not having to pull intothe service station every week around home to fuel up. I filled up last week and I had a 912 DTE after fueling , the next day I did someforscan work and DTE went down to 640 miles. I was out playing golf and when I gotinto truck to return home, the gage, it went to 760 DTE, and I only drove maybe 40to 60 miles since fueling up. I currently have 733 DTE on the F150 now. I think maybe my forscanupdate, which was done after I fueled up, could have affected my DTE numbers. Oncethe fuel gage gets off the full mark, I am going to fill up again and see if I canget back to the 900 mark and hopefully watch it go down slower and steady without thisrandom gage reading.
 

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One thing I have noticed with my 48-gallon Titan replacement tank is that it takes a long time for the fuel gauge to move off of Full, and it also drops fairly quickly when under 1/4 tank. I would be curious if those with the 40-gallon Titan have a similar experience. What I am saying is that it will not match your steady declining fuel gauge experience as you had with the OEM tank.
With the 40 gallon XXL tank, it takes a little while to drop off full = from 894 miles to 800 miles, the gauge read around 15/16 with it not seeming to budge over the first 50-60 miles, but I think it just moves so little that it looks 100% Full. From 800 miles to 700 miles, I am a little below 7/8 full, so the % full is not tracking true, but as long as DTE is close and it zeroes in towards empty, this behavior doesn't bother me.

I think some of this is due to the shape of the larger XXL tank and how it stretches up-and-over the cross-member, so the bulk of the capacity/volume is in the upper 3/4 of the tank. Does this make sense? Maybe this effect is more pronounced with your larger 48 gallon XXL tank with the 6.5' bed.
 

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I am loving my 40 gallon tank. I have run the DTE down below 20 last 2 fill ups and still can only get 31-32 gallons in the tank. I bought this because I get fuel points discount up to 35 gallons, I still feel like I am wasting some savings only getting 31 of my 35 gallons at $1 off.
 

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After more time to reflect I am so disappointed in this tank. I just filled up from completely empty on gauge. DTE was 3 miles. I could only get 34 gallons in the tank with fuel spitting out on the ground.

Wether the tank is small or the sending unit does not read correctly. Either way for $1200 this is not acceptable.

Next empty I am removing the tank to siphon every drop out and fill again to check true size.
 

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@Saathoff05 - I am seeing the same exact thing you are: After driving the DTE down to zero two-out-of-the-last-three fills, I have never gotten more than 34.5 gallons on any fill.

The question now becomes, how much of those 5.5 "reserve" gallons is really accessible/useable?

I would be interested in the results of your siphoning experiment if you find there is really 5.5 gallons left in the tank, because if so then I wonder if:
1.) The DTE is just off
2.) The Titan XXL tank is deeper than the stock tank and the factory sending unit/suction pickup is too short now and can't "reach" all of those 5.5 reserve gallons

If the latter, then I will tend to agree with you:
=> If the sending unit/pickup is not replaced, then I would hope for the price we paid that Titan designed the tank to have the same pickup height as the factory tank
=> I don't really want to test how far past 0 DTE miles we can go, as I don't think you ever want to run out of fuel with this or any other diesel engine

The new XXL tank is clearly ~3" deeper (why the factory shield can't go back on) but I didn't do my install, so I don't know if the hole where the sending unit goes is offset that same depth.
@kdjasper - what is your max gallon fill on the larger 48 gallon XXL tank for the 6.5' beds?
 

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@Saathoff05 - I am seeing the same exact thing you are: After driving the DTE down to zero two-out-of-the-last-three fills, I have never gotten more than 34.5 gallons on any fill.

The question now becomes, how much of those 5.5 "reserve" gallons is really accessible/useable?

I would be interested in the results of your siphoning experiment if you find there is really 5.5 gallons left in the tank, because if so then I wonder if:
1.) The DTE is just off
2.) The Titan XXL tank is deeper than the stock tank and the factory sending unit/suction pickup is too short now and can't "reach" all of those 5.5 reserve gallons

If the latter, then I will tend to agree with you:
=> If the sending unit/pickup is not replaced, then I would hope for the price we paid that Titan designed the tank to have the same pickup height as the factory tank
=> I don't really want to test how far past 0 DTE miles we can go, as I don't think you ever want to run out of fuel with this or any other diesel engine

The new XXL tank is clearly ~3" deeper (why the factory shield can't go back on) but I didn't do my install, so I don't know if the hole where the sending unit goes is offset that same depth.

@kdjasper - what is your max gallon fill on the larger 48 gallon XXL tank for the 6.5' beds?
I usually can go through a tank pretty quickly but I shut down travel for work starting yesterday when I got home. It might be a bit to get through this tank.

Picked up new July 3 and have almost 23K on it 😂😂

I could also put 5gal in bed and run it until it dies 🏼
 

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That's a real bummer you two aren't getting the full 40 gallons out of that tank! I'm interested in this product but not with that issue. I'm sure you'll let us know how it goes .. have y'all contacted Titan by chance? Interested to hear their thoughts as well.

My bet is this is a sending unit issue and you *probably* have another 5 gallons in the tank. If this is the ol' float on a rod technology maybe something as simple as bending the rod or replacing with a different rod will fix the issue. You may have to lower the actual sending unit though which isn't as easy. Unfortunately testing to see where the "missing" 5.5 gallons might be is not an easy quest to answer. I'd be hesitant before running her dry if that's what you're suggesting @Saathoff05, at least without being ready to prime the lines and bleed the air from them. Your fuel pump won't pump and your truck won't start when you fill her back up without doing that first!
 

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That's a real bummer you two aren't getting the full 40 gallons out of that tank! I'm interested in this product but not with that issue. I'm sure you'll let us know how it goes .. have y'all contacted Titan by chance? Interested to hear their thoughts as well.

My bet is this is a sending unit issue and you *probably* have another 5 gallons in the tank. If this is the ol' float on a rod technology maybe something as simple as bending the rod or replacing with a different rod will fix the issue. You may have to lower the actual sending unit though which isn't as easy. Unfortunately testing to see where the "missing" 5.5 gallons might be is not an easy quest to answer. I'd be hesitant before running her dry if that's what you're suggesting @Saathoff05, at least without being ready to prime the lines and bleed the air from them. Your fuel pump won't pump and your truck won't start when you fill her back up without doing that first!
One thing I forget to mention... When I originally installed the tank I had an issue filling. Long story short, I had to remove the tank to find there was a plastic plug in to vent nipple. This was a stupid mistake on my part. There was a cover, which I removed when take was mounted and I hooked up the vent tube, but I missed there was also a plug.

Anyways, when I removed the tank to inspect the issue, I ran the DTE down to 15 miles. There was not 5 gallons in the tank. I lowered it by hand. At that time I should have dumped it out and checked how much was left but had not yet noticed it was only accepting 34 gallons.

Maybe I better look into if there is a primer at the fuel filter like a duramax :grin2:

Truck is at dealership for some warranty work today. Sync screen freezing up. The module needed changed. It will be slow going through holiday to run this full tank empty but as soon as I can I will pump the rest of tank out for exact amount still left in when DTE is 0.
 

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Ohhhh, ok. I assumed like @jmperlik the fuel was there, the issue was either the DTE calculation or the ability to get at it ... but it sounds like the fuel just isn't there and in that case you're having issues maximizing the capacity of the tank. You said you filled her up as much as she would hold, until it was overfilling, but do you think the issue could be in that fill up? I attached the best picture I could find of the factory tank (maybe not exactly ours but hopefully close) and the 40 gal Titan. Comparing the two, it looks like some of the extra capacity is captured in two elevated areas separate from any vent where the factory tank is tapered from where the fuel goes in ... hmmmm

I had a jeep TJ that would puke gas out every dang time I filled up. Like, the handle would click and a quarter cup of gas would rush out and it had a little force to it. It's a known and fun little problem that was never addressed in any recall. I eventually replaced the filler hose with one that had a sort of oneway valve (out of a chevy) because Chrysler, in all their wisdom, couldn't manage that fix. Anyways, I figured the building vapor from the fuel entering the tank would shoot out once the tank was full. Point being, could vapor be building in those two pockets and prevent them from filling with fuel?? If true would constitute a design flaw to me but maybe you could wait a minute at fill up then rock the truck back and forth after you get the click and maybe jostle that vapor out of those pockets and get a little more fuel in? That could be totally wrong, just thinking outside the box here ..

I hope whatever the issue is you get it figured .. best of luck and let us know!!
 

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Ohhhh, ok. I assumed like @jmperlik the fuel was there, the issue was either the DTE calculation or the ability to get at it ... but it sounds like the fuel just isn't there and in that case you're having issues maximizing the capacity of the tank. You said you filled her up as much as she would hold, until it was overfilling, but do you think the issue could be in that fill up? I attached the best picture I could find of the factory tank (maybe not exactly ours but hopefully close) and the 40 gal Titan. Comparing the two, it looks like some of the extra capacity is captured in two elevated areas separate from any vent where the factory tank is tapered from where the fuel goes in ... hmmmm

I had a jeep TJ that would puke gas out every dang time I filled up. Like, the handle would click and a quarter cup of gas would rush out and it had a little force to it. It's a known and fun little problem that was never addressed in any recall. I eventually replaced the filler hose with one that had a sort of oneway valve (out of a chevy) because Chrysler, in all their wisdom, couldn't manage that fix. Anyways, I figured the building vapor from the fuel entering the tank would shoot out once the tank was full. Point being, could vapor be building in those two pockets and prevent them from filling with fuel?? If true would constitute a design flaw to me but maybe you could wait a minute at fill up then rock the truck back and forth after you get the click and maybe jostle that vapor out of those pockets and get a little more fuel in? That could be totally wrong, just thinking outside the box here ..

I hope whatever the issue is you get it figured .. best of luck and let us know!!
I wonder that same thing. I have reached out to Titan to discuss. Hopefully they get back to me.

There is an alternate vent hose right where the bump up is. It’s a 2” piece of hose with a little check valve on it. I am now wondering if I could take off the 2” hose and plumb that into the main vent tube. Would not be that hard I do not believe.
 

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Could it be just a case of the fuel pickup not being at the bottom of the tank ?

ie. the system (titan tank and factory fuel pump assembly) acting as if its empty when the fuel level drops below the point that the fuel pickup can access fuel... and there is still 5.5 Gallons left sloshing around that the pickup can't access ? it would act like a 34.5 gallon tank
 

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Could it be just a case of the fuel pickup not being at the bottom of the tank ?

ie. the system (titan tank and factory fuel pump assembly) acting as if its empty when the fuel level drops below the point that the fuel pickup can access fuel... and there is still 5.5 Gallons left sloshing around that the pickup can't access ? it would act like a 34.5 gallon tank
The fuel pick up is at the bottom of the tank. Understood on your second point however I did have to take this tank out after initial install. I ran it down to empty to remove and there was not 5 gallons left. I am about empty now, I will put the truck on an incline and pump the tank to verify exact amount of fuel left at "DTE 0".
 
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