32 Gal Fuel Tank not taking 32 Gal

[rescuejew91]

So i had an issue with my fuel gauge they replaced half my dashboard along with the sensor in the tank. after 2 weeks i still was having issues so they ended up replacing my full fuel pump. however ever since then i feel they set it to a 28 gal tank not the 32 gal i have. even when i try and run it bone dry i never get more than 27 gal's. before this i recall getting 30 in now and then. is there any way for me to test this or check it without having to pay the dealer 185 service charge for them to just reporgam it and lie and say nothing was wrong.

 

[NJMOPAR]

You know that running it bone dry is bad for the fuel pump, right? The gas cools the pump.

 

[crash68]

FYI there have been various repots of bad fuel sending unit a that either the level sensor is bad and shows more/less fuel than actually in the tank or the fuel pick up part of the sending unit is too high and won't draw the fuel down to the bottom of the tank. People have reported running out of fuel with just below a 1/4 showing or the engine tends to stumble and stall when the tank level is under a 1/4.

 

[62Blazer]

Assuming when you say "bone dry" that means the gas gauge is on E? I guess you could just put a 5 gallon gas can in the bed and keep driving the truck until it stops running. Fill it up with the 5 gallon can and drive to the nearest gas station and see how much more it takes to fill up.

On my '16 2500 6.4 truck the gas gauge seems to go to E and the low fuel light comes on pretty early. When I first got it I was sweating bullets on the first long trip hauling a trailer. The low fuel light came on when I was in the middle of nowhere and was afraid I was going to run out of gas. Drove at least 20 miles until I found a gas station and it only took 26 gallons to fill up the tank.

 

[Different Drummer]

I have similar issues with the 32 Gallon tank. When I first got the truck new if I filled up when just touching E after the fuel low light came on it would only take around 26 gallons. After having this happen at least a half dozens times I figured that the system must be calibrated for the 26 gallon fuel tank and that no adjustments were made for the optional 32 gallon tank. I do a lot of long over the road driving. So I started just ignoring the gauge and light. I figured I had a conservative 100 miles past empty with a safe margin remaining. I used this method for some time without any difficulty on occasion putting over 700 miles on a fill and usually putting about 30 gallons in at fill up. Making adjustments for type of terrain, head winds etc are of course in order. The MPG reading though not perfect in it's calculations can assist with that as well.
Then one day when I went maybe 25 miles past empty when I filled up it took 32 gallons of fuel. Go figure!! So now I am not quite as adventurous in regards to how long I run it past empty. The whole fuel monitoring system seems to function somewhere in an alternate universe.

 

[MRFREEZE57]

I think the gauge tends to err on the safe side. one time my truck said 66 miles reserve left and took a little over 25 gal. and it does have the 32 gal tank.

 

[Tach_tech]

What year is your truck?

There was a cluster flash released for exactly this issue.

 

[Gero]

What year is your truck?

There was a cluster flash released for exactly this issue.

How do we get this done? Or what do we say at the dealer? I upgraded to the 32g on my driveway and the most I've put in was 28G and thats with the fuel light on for a good chunk.

 

[Tach_tech]

How do we get this done? Or what do we say at the dealer? I upgraded to the 32g on my driveway and the most I've put in was 28G and thats with the fuel light on for a good chunk.

Your situation would be trickier since your truck didn’t come with the 32gal tank. My only guess would be trying to add the sales codes and go from there, but it may not be possible. I’ve never tried it myself.

 

[Bigskyroadglide]

My 11 has a 32 and until the flash update mentioned above would show E about 26. Once I had the update, easily 30 gallon fills. The update was key

 

[RAMTRPR]

My 11 has a 32 and until the flash update mentioned above would show E about 26. Once I had the update, easily 30 gallon fills. The update was key

I have an 09’ with a custom tune. How do get the update?


Sent from my iPhone using Tapatalk Pro

 

[Different Drummer]

There is another thread on the forum that talks about the flash to correct the fuel gauge issue with the 32 gallon upgrade. It was allegedly included with a recall or upgrade to a totally different system. I think it may have something to do with activating"park sense"? I have park sense so it did not apply to my Laramie. Next time I am at the dealer I plan to ask about it.
A search on the site should turn up the thread I am referring to.

 

[Docwagon1776]

My 11 has a 32 and until the flash update mentioned above would show E about 26. Once I had the update, easily 30 gallon fills. The update was key

When did you get that done? I tried to get it done on my '12 maybe a year or two ago and was told it was only part of the update for the 8 speed equipped trucks.

 

[Bigskyroadglide]

When did you get that done? I tried to get it done on my '12 maybe a year or two ago and was told it was only part of the update for the 8 speed equipped trucks.

It was in 15 or 16. Got it done at the dealership in Montana. Been working out of state since 17, so truck has not been back there since then

 

[huntergreen]

I have similar issues with the 32 Gallon tank. When I first got the truck new if I filled up when just touching E after the fuel low light came on it would only take around 26 gallons. After having this happen at least a half dozens times I figured that the system must be calibrated for the 26 gallon fuel tank and that no adjustments were made for the optional 32 gallon tank. I do a lot of long over the road driving. So I started just ignoring the gauge and light. I figured I had a conservative 100 miles past empty with a safe margin remaining. I used this method for some time without any difficulty on occasion putting over 700 miles on a fill and usually putting about 30 gallons in at fill up. Making adjustments for type of terrain, head winds etc are of course in order. The MPG reading though not perfect in it's calculations can assist with that as well.
Then one day when I went maybe 25 miles past empty when I filled up it took 32 gallons of fuel. Go figure!! So now I am not quite as adventurous in regards to how long I run it past empty. The whole fuel monitoring system seems to function somewhere in an alternate universe.

Almost sounds like the gas station needs to recalibrate their pumps.

 

[PoMansRam]

I know there's a ton of threads on this, but my 2017 Ram 1500 came with the 32gal tank. I could run it 'till the low fuel warning came on and could barely squeeze 26gal into it. I never towed with it or anything so it was all good to have the reserve.

 

[Different Drummer]

Almost sounds like the gas station needs to recalibrate their pumps.

With three round trips to Newfoundland, three round trips to Florida and one round trip to Northern California there are a lot of gas stations that need recalibrating then.

 

[Docwagon1776]

It was in 15 or 16. Got it done at the dealership in Montana. Been working out of state since 17, so truck has not been back there since then

If you happen to still have the work order, if there's a TSB number or something please post it. Many of us here have tried to get this updated in our 6 speed trucks and dealers have told us there's no update or reflash for those.

 

[Different Drummer]

My truck goes in on the 28th for some minor warranty work. Small paint blister on lower front edge of hood. While I was at the dealership two days ago I brought up the Flash on the fuel tank and told the service manager what I knew in regards to the fuel calibration being shirt tailed onto the Park Sense flash. It is a small dealership and they have one Tech. who apparently is the electronic wizard in their shop. Service manager said they would have him research the fuel recalibration between now and the 28th and attend to it while the truck is in for the paint work.
I will report back on what develops after I get the truck back.

 

[indept]

Assuming when you say "bone dry" that means the gas gauge is on E?

I'm pretty sure bone dry means just that, no gas at all left and engine goes "cough cough", then quiet.