Jump to content

Fuel tank

nards444
 Share

Recommended Posts

nards444 Senior Enthusiast

nards444

Posted
Posted

Anybody ever check this.  I have a 21 HD Diesel.  I let the fuel get down to the alarm and go fill up at the gas station.  I will only fill up to 29-30 gallons.  I cant imagine when the low fuel goes off it goes off with 6-7 gallons left.  Am I missing something.

Thankful Enthusiast

Thankful

Posted
Posted
2 hours ago, nards444 said:

Anybody ever check this.  I have a 21 HD Diesel.  I let the fuel get down to the alarm and go fill up at the gas station.  I will only fill up to 29-30 gallons.  I cant imagine when the low fuel goes off it goes off with 6-7 gallons left.  Am I missing something.

Diesel fuel foams up so much the nozzle shuts off long before the tank is full.  I can always pump at least 3 or 4 more gallons after the first auto shut off of the nozzle.

  • Like 1
nards444 Senior Enthusiast

nards444

Posted
  • Author
Posted
7 minutes ago, Thankful said:

Diesel fuel foams up so much the nozzle shuts off long before the tank is full.  I can always pump at least 3 or 4 more gallons after the first auto shut off of the nozzle.

yeah I as thinking that as well.  Ill have to play around some. 

Random Enthusiast

Random

Posted
Posted
47 minutes ago, Thankful said:

Diesel fuel foams up so much the nozzle shuts off long before the tank is full.  I can always pump at least 3 or 4 more gallons after the first auto shut off of the nozzle.

Pretty much this. I typically wait around 30 seconds after the nozzle first tops and then slowly fill up the remainder to reduce foaming. If you are filling up in a commercial truck lane it's even worse with how high flow those nozzles are.

newdude Senior Enthusiast

newdude

Posted
Posted

When I had my Colorado Diesel, the light would come on about 2-3 left, and the LOW message when there was less than 2 gallons.  When I would fill, I'd let off pressure on the trigger on the nozzle to slow down the fuel fill speed to let what's already in there start to settle.  I could easily get 19-20 gallons in the 21 gallon tank it had.  

unit Enthusiast

unit

Posted
Posted (edited)

Foaming isn't it.  I might get ½ gal more after waiting but that's about it.  Auto makers do it for two reasons: 1 - to keep you from running out of fuel and 2 - to keep from burning out the fuel pump.  The fuel pump is located in the fuel tank.  The fuel cools the pump and If you run too low on fuel there is a good chance you will burn out the pump.  There was no fuel pump on GM Diesels prior to 2017.  The high pressure pump on the engine used vacuum to pull the fuel through to the engine.  An in tank pump was added for the LP5 engines because they are more powerful and require more fuel.  I don't have a problem with the way the gauge reads as long as I know there is X amount of fuel when the gauge reads low.

Edited by unit
  • Haha 1
Thankful Enthusiast

Thankful

Posted
Posted
1 hour ago, unit said:

Foaming isn't it.  I might get ½ gal more after waiting but that's about it.  Auto makers do it for two reasons: 1 - to keep you from running out of fuel and 2 - to keep from burning out the fuel pump.  The fuel pump is located in the fuel tank.  The fuel cools the pump and If you run too low on fuel there is a good chance you will burn out the pump.  There was no fuel pump on GM Diesels prior to 2017.  The high pressure pump on the engine used vacuum to pull the fuel through to the engine.  An in tank pump was added for the LP5 engines because they are more powerful and require more fuel.  I don't have a problem with the way the gauge reads as long as I know there is X amount of fuel when the gauge reads low.

I always get 3 to 4 gallons after foaming shuts the nozzle off the first time. Always.  It will shut off several times but after the first auto shut off, I keep on delivering fuel until I see the diesel in the tube, always 3 to 4 gallons.

XY74 Enthusiast

XY74

Posted
Posted

I put 35.4 gallons in mine recently.  The light was on for 30 miles or so.  Odd circumstances, I almost never let it go below 1/4. 

unit Enthusiast

unit

Posted
Posted

Well, that was certainly pushing it to the limit.  Glad to hear you made it to a fuel stop in time.  I carry a 5 gallon jerry can in the bed when traveling just to ensure I can add a little fuel when needed.  I had a similar circumstance three years ago in the Mojave desert and I wasn't at all sure I'd make it to a station that had diesel.  I did make it but it was close!

Tomato Enthusiast

Tomato

Posted
Posted

The only time I ever had a foaming issue of significance was with B20 biodiesel. I did not want to use it, but that's all the station had.  Too me about 10 minutes to fill the tank.

nards444 Senior Enthusiast

nards444

Posted
  • Author
Posted

Yeah was on a long trip this weekend and twice samething and let it sit for a half a min and maybe got half a gallon.  Im thinking the light coming on means there is more than 3 gallons like it seems to be in other vehicles.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Atlas
      Tire psi

      By Atlas · Posted

      It's possible the two trucks are using different body control modules which is why yours works and the OP's doesn't.   So much in these newer vehicles depends on model/trim configurations, production date. They don't all use the same modules like back in the day.
    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      I forgot to answer the question as per what market mine is set to and yes I finally found that area on mine and yes its also set to America.   So here's something I realized as I wasn't looking at that part in the Sierra section until now, your right that what I see here as choice 3 under Sierra which says 07/2023-06/2026 ( 433 MHz 13542523 ) it has no choice 5 for tire pressure selection. Where as it does under the Chev choice. However I kept going down the list within the Sierra and I am really wondering if choice 9 will work for your truck as it has the same model number and hertz sensor as my truck. I would say try that choice first, if that doesn't work then jump over to the Chev section and again choose that same model and hertz choice as for some reason the Chev section gives the choice 5 of tire type/pressure selection for going back a number of years. Could very well be an Autel thing that they just didn't get the updates all done properly under Sierra but anyway first try that selection 9 I suggested under Sierra and then go from there. 
    • B07
      Anyone have a spare?

      By B07 · Posted

      Looking for this piece that holds the hose clamp in place. I have the hose clamp just not that other piece. Dealers and wrecking yards in my area will not sell just that piece. They want you to buy the whole air tube $100 +/- to get that $5 part.  that piece isn't molded to the air tube as I looked at my friends truck. It's held on by a screw and nut. I'm trying to put the OEM parts on the truck as the previous owner butchered things up installing an aftermarket CAI. It really looked homemade. 🤣 Thanks
    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      Ok I missed that part that yours is a GM. The strange part is that the choice for year ranges and within the year of 2026 is different on the Sierra then on the Chev for some reason as I am looking at my tool at the Sierra choices. Now I am guessing you see as to your sensor part number as it may be different on your truck for some reason and a call to GM should get you the part model number of the sensors you should have as well as which MHz your sensors are. I know mine are the ones as per what I listed but there are other choices in the Autel and got me wondering if by some chance they put different ones in your truck. Having said that, did you try using each of the choices starting from No 1 and going on down the list, not sure if that would mean shutting off the engine each time and resetting the tool and going at it again each time. Also I thought of something else which may sound retarded but if there was some stupid chance that the chev choice would work. The reason I say that is that the Sierra is showing a range up to 06/2026 for the various choices of sensors it could be where as the Chev has one choice that has that 12/2026. By the way it is possible to not run the truck and you may know that as per not pressing the brake but pressing and holding the start button for a few seconds and it lights up the dash ( its called service mode ) but that sucks battery power and if it were me doing it that way I would be throwing on a decent sized battery charger before doing it that way as killing your battery won't make you happy at me at all !.    Like I say, just a thought to try the Chev choices if you have already exhausted the Sierra choices but first it would be nice to know for sure what exact sensor model and hertz your truck uses as I assume only those choices that mention the sensor would work unless a choice that does not mention the sensor model would somehow work. Its frustrating when one is trying to use tools like this without the experience of the tool and the vehicle, as I am sure dealer techs themselves struggle with it when starting out or a new model year comes along that is slightly different. 
    • jgaudet99
      Tire psi

      By jgaudet99 · Posted

      I tried before I updated the scan tool just incase an update messed it up, but it never worked so I updated the scan tool and it still didn't work.   Only difference is I click on Sierra not Chevrolet cause I have a Sierra.   If I click on 2026-2024 I didn't have any option to change placard, when I click on 2023 it does give me the option but when I try to do it,.it says vehicle not supported!   I have my region or market or whatever it is set to America I think, is that what yours is set to?

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...