Gas tank size - Chevy Colorado & GMC Canyon
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post #1 of 61 (permalink) Old 05-31-2019, 12:36 AM Thread Starter
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Gas tank size

According to google, my gas tank size is 21 gallons. ive got a 2019, 6 speed 4cyl extended cab. I've filled up twice only. Just today, close to empty but I only went up to almost 17 gallons. Am I to assume I had 4.x more gallons? What are your experiences?
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post #2 of 61 (permalink) Old 05-31-2019, 12:46 AM
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According to google, my gas tank size is 21 gallons. ive got a 2019, 6 speed 4cyl extended cab. I've filled up twice only. Just today, close to empty but I only went up to almost 17 gallons. Am I to assume I had 4.x more gallons? What are your experiences?
I just ran my truck very low today, probably about 10 miles after the 30 limit on the DIC. It took 20 gallons.

So about 21 is pretty close I'm sure.
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post #3 of 61 (permalink) Old 05-31-2019, 05:50 AM Thread Starter
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Originally Posted by LookImNewOK View Post
According to google, my gas tank size is 21 gallons. ive got a 2019, 6 speed 4cyl extended cab. I've filled up twice only. Just today, close to empty but I only went up to almost 17 gallons. Am I to assume I had 4.x more gallons? What are your experiences?
I just ran my truck very low today, probably about 10 miles after the 30 limit on the DIC. It took 20 gallons.

So about 21 is pretty close I'm sure.
Interesting. Ok, thanks. I'll try to go further next time.
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post #4 of 61 (permalink) Old 05-31-2019, 06:12 AM
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21 gallons officially. It's bigger than that though, as I've been able to get 2-3 more gallons in by going slowly after the cutoff. That's probably not a good idea though, so stick with the manual and don't do that.
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post #5 of 61 (permalink) Old 05-31-2019, 07:28 AM
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21 gallons officially. It's bigger than that though, as I've been able to get 2-3 more gallons in by going slowly after the cutoff. That's probably not a good idea though, so stick with the manual and don't do that.
LOL - okay Dad.

I have actually filled my tank with 19 - 20 gallons on a few occasions. Once even got 20.5 gallons. So, I can vouch for the 21 gallon tank size.

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post #6 of 61 (permalink) Old 05-31-2019, 07:35 AM
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Also overfilling is bad damages the Evap system. The most Iíve put in my truck was 18 gallons and some change even on empty unless you really run it down you have a 2-4 gallon reserve idk what it is on our trucks

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post #7 of 61 (permalink) Old 05-31-2019, 08:02 AM
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LOL - okay Dad.
The evap canister on most vehicles will cost $300 and up and usally are a pain to change. Dad gives good advice........

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post #8 of 61 (permalink) Old 05-31-2019, 08:24 AM
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The evap canister on most vehicles will cost $300 and up and usally are a pain to change. Dad gives good advice........
I did not know this. Good information to store away next time I think, just one more gallon........

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post #9 of 61 (permalink) Old 05-31-2019, 08:26 AM
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The evap canister on most vehicles will cost $300 and up and usally are a pain to change. Dad gives good advice........

How is it damaged? I always put in at least a gallon over after the gas clicks off. Seems like it always clicks off early and when I get in I am a hair under the full mark. As if there was some venting problem or something...never had that happen before with prior vehicles.
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post #10 of 61 (permalink) Old 05-31-2019, 08:38 AM
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If you like replacing the "fuel pump" please run'r low.

Otherwise fill the tank when you hit 1/4 tank.
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post #11 of 61 (permalink) Old 05-31-2019, 08:53 AM
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How is it damaged? I always put in at least a gallon over after the gas clicks off. Seems like it always clicks off early and when I get in I am a hair under the full mark. As if there was some venting problem or something...never had that happen before with prior vehicles.

I think this explains it. Also I do top off just to get to a round number ur whole dollar

https://www.angieslist.com/articles/...r-gas-tank.htm
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post #12 of 61 (permalink) Old 05-31-2019, 08:53 AM
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How is it damaged? I always put in at least a gallon over after the gas clicks off. Seems like it always clicks off early and when I get in I am a hair under the full mark. As if there was some venting problem or something...never had that happen before with prior vehicles.

https://www.youtube.com/watch?time_c...&v=igE14GMhr5Y
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post #13 of 61 (permalink) Old 05-31-2019, 09:12 AM
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The tank is larger than 21 gal. I heard its very similar to the Silverado tank. Having a diesel which has no evap system in it, I have put in 23 gallons when the DIC displayed LOW FUEL LEVEL instead of a range left...that went all the way to the top of the filler neck.

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post #14 of 61 (permalink) Old 05-31-2019, 10:26 AM
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Interesting. Ok, thanks. I'll try to go further next time.
I didn't know it was a game or competition to see how far you can go until you run out.


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post #15 of 61 (permalink) Old 05-31-2019, 10:45 AM
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How is it damaged? I always put in at least a gallon over after the gas clicks off. Seems like it always clicks off early and when I get in I am a hair under the full mark. As if there was some venting problem or something...never had that happen before with prior vehicles.
The EVAP canister is there to store fuel vapors from the fuel tank that are vented back to the canister, so they can be returned to the engine thru the Purge Valve and be burned off thru the exhaust to cut down on air pollution. When overfilling, liquid fuel can enter the canister thru the vent tube in the upper filler neck, and liquid fuel saturates and damages the charcoal in the canister and too much fuel to be burnt off. Kind of an explanation of why NOT to top off the tank after the pump shuts off.
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post #16 of 61 (permalink) Old 05-31-2019, 02:20 PM
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The EVAP canister is there to store fuel vapors from the fuel tank that are vented back to the canister, so they can be returned to the engine thru the Purge Valve and be burned off thru the exhaust to cut down on air pollution. When overfilling, liquid fuel can enter the canister thru the vent tube in the upper filler neck, and liquid fuel saturates and damages the charcoal in the canister and too much fuel to be burnt off. Kind of an explanation of why NOT to top off the tank after the pump shuts off.

Ok...makes sense. I read some articles in those links in the prior posts and there is no debate about it. But the numbers just don't jive up. I average 18.4 mpg and my fuel page say distance to empty is less than 30 miles...which means I have less than 2 gallons of gas left in the tank. I use the Chevy app to confirm this. When I fill up, I expect to at least put 18 gallons of gas in the tank and it cuts off at 16.5~17.3. I start the truck and the gauge is a hair below the full line. Something is not right...so I slowly put in an extra gallon and the gauge reads right. I had a Ford F-150 before this truck and a Nissan Pathfinder prior to that one...and their fuel pages were always spot on...numbers always jived. So either the Chevy computer/sensors/whatever are out of whack or the system is designed in such a manner that the fuel pump cuts off to early. Does this mythical reserve storage come into play here? I don't recall seeing it in the owner's manual and the service managers I have talked to don't know anything about it.
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post #17 of 61 (permalink) Old 05-31-2019, 02:56 PM
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If you like replacing the "fuel pump" please run'r low.

Otherwise fill the tank when you hit 1/4 tank.
Old wive's tale. The fuel pumps are cooled by fuel/gas flowing THROUGH them and not by being submerged IN the fuel.

It's similar to the argument that running low will suck up more crap from the bottom of the tank. Fuel is ALWAYS pulled from the bottom of the tank, if there's crap down there then it will get disturbed and sucked up no matter what the fuel level is.
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post #18 of 61 (permalink) Old 05-31-2019, 03:31 PM
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Old wive's tale. The fuel pumps are cooled by fuel/gas flowing THROUGH them and not by being submerged IN the fuel.

It's similar to the argument that running low will suck up more crap from the bottom of the tank. Fuel is ALWAYS pulled from the bottom of the tank, if there's crap down there then it will get disturbed and sucked up no matter what the fuel level is.
I would agree with your first point, but not the second. With a long flat fuel tank a lower level will result in more sloshing/waves near the bottom of the tank and get more stuff off the bottom suspended in the fuel. So it's not where it sucks from but what it's sucking. That said, that's what filters are for and you'd probably have to keep the tank half full to avoid that entirely.
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post #19 of 61 (permalink) Old 05-31-2019, 03:51 PM
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I would agree with your first point, but not the second. With a long flat fuel tank a lower level will result in more sloshing/waves near the bottom of the tank and get more stuff off the bottom suspended in the fuel. So it's not where it sucks from but what it's sucking. That said, that's what filters are for and you'd probably have to keep the tank half full to avoid that entirely.
Problem with that thinking is that every time you fill up the fuel tank the stream of fuel causes what's in the tank to slosh around. Less so if you always fill up around 1/2 tank, but the issue of sediment/debris shouldn't be an issue with plastic tanks as that was largely due to internal corrosion over time with metal tanks.

I've owned multiple vehicles that had over 100k miles and some with almost 200k put on them before they were sold, frequently filled up below 1/4 tank, and not once have I ever lost an in-tank fuel pump or had an issue with debris plugging up the sock connected to the pump inlet. The whole "never run below 1/4 tank" is just an old ghost story people tell around the campfire and it won't die (much like the fuel pumps unless they actually suck air for long enough ).

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post #20 of 61 (permalink) Old 05-31-2019, 03:52 PM
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LOL - okay Dad.

I have actually filled my tank with 19 - 20 gallons on a few occasions. Once even got 20.5 gallons. So, I can vouch for the 21 gallon tank size.

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You just made it. According to the OM the capacity is 20.6 gal. Am I the only one who got an OM with his truck?


There are lots of good reasons to not top off. The only good reason I've seen for doing it is greco's. Now that I've seen it I don't know that I can not do it. Unfortunately I have some irrational dislike for odd numbers so I'd have to pump till I get to the next even number.
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Last edited by Tucson Bill; 05-31-2019 at 03:58 PM. Reason: Read the rest of the thread
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