1991 Chevrolet C/K 1500 Series Gas Tank Size & Fuel Capacity
Fuel tank capacity
25.0–34.0gal · 95–129 L
The 1991 Chevrolet C/K 1500 Series has a fuel tank capacity of 25.0 to 34.0 gallons (95–129 liters), depending on the trim. The most common size is 34.0 gallons, used on 14 trims.
A full tank is good for roughly 300–714 highway miles or 225–510 miles around town, going by the EPA ratings.
34.0 gal · Bigger than 95% of 1991 models we list.
1991 Chevrolet C/K 1500 Series fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Drive
- no difference
- Cab
- no difference
- Bed
- Engine
All 27 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| 2dr Extended Cab 4WD SB 4.3L 6cyl 4M · 4WD MPG 15 / 19Range 375 / 475 mi | 4.3L 6cyl 4M | 4WD | 25.0 gal95 L | 15 / 19 | 375 / 475 mi | |
| 2dr Extended Cab SB 4.3L 6cyl 4M · RWD MPG 15 / 21Range 375 / 525 mi | 4.3L 6cyl 4M | RWD | 25.0 gal95 L | 15 / 21 | 375 / 525 mi | |
| 2dr Regular Cab 4WD SB 4.3L 6cyl 4M · 4WD MPG 15 / 19Range 375 / 475 mi | 4.3L 6cyl 4M | 4WD | 25.0 gal95 L | 15 / 19 | 375 / 475 mi | |
| 2dr Regular Cab SB 4.3L 6cyl 4M · RWD MPG 15 / 21Range 375 / 525 mi | 4.3L 6cyl 4M | RWD | 25.0 gal95 L | 15 / 21 | 375 / 525 mi | |
| 454SS 2dr Regular Cab SB 7.4L 8cyl 4A · RWD MPG 9 / 12Range 225 / 300 mi | 7.4L 8cyl 4A | RWD | 25.0 gal95 L | 9 / 12 | 225 / 300 mi | |
| Scottsdale 2dr Extended Cab 4WD SB 4.3L 6cyl 4M · 4WD MPG 15 / 19Range 375 / 475 mi | 4.3L 6cyl 4M | 4WD | 25.0 gal95 L | 15 / 19 | 375 / 475 mi | |
| Scottsdale 2dr Extended Cab SB 4.3L 6cyl 4M · RWD MPG 15 / 21Range 375 / 525 mi | 4.3L 6cyl 4M | RWD | 25.0 gal95 L | 15 / 21 | 375 / 525 mi | |
| Scottsdale 2dr Regular Cab 4WD SB 4.3L 6cyl 4M · 4WD MPG 15 / 19Range 375 / 475 mi | 4.3L 6cyl 4M | 4WD | 25.0 gal95 L | 15 / 19 | 375 / 475 mi | |
| Scottsdale 2dr Regular Cab SB 4.3L 6cyl 4M · RWD MPG 15 / 21Range 375 / 525 mi | 4.3L 6cyl 4M | RWD | 25.0 gal95 L | 15 / 21 | 375 / 525 mi | |
| Silverado 2dr Extended Cab 4WD SB 4.3L 6cyl 4M · 4WD MPG 15 / 19Range 375 / 475 mi | 4.3L 6cyl 4M | 4WD | 25.0 gal95 L | 15 / 19 | 375 / 475 mi | |
| Silverado 2dr Extended Cab SB 4.3L 6cyl 4M · RWD MPG 15 / 21Range 375 / 525 mi | 4.3L 6cyl 4M | RWD | 25.0 gal95 L | 15 / 21 | 375 / 525 mi | |
| Silverado 2dr Regular Cab 4WD SB 4.3L 6cyl 4M · 4WD MPG 15 / 19Range 375 / 475 mi | 4.3L 6cyl 4M | 4WD | 25.0 gal95 L | 15 / 19 | 375 / 475 mi | |
| Silverado 2dr Regular Cab SB 4.3L 6cyl 4M · RWD MPG 15 / 21Range 375 / 525 mi | 4.3L 6cyl 4M | RWD | 25.0 gal95 L | 15 / 21 | 375 / 525 mi | |
| 2dr Extended Cab 4WD LB 4.3L 6cyl 4M · 4WD MPG 15 / 19Range 510 / 646 mi | 4.3L 6cyl 4M | 4WD | 34.0 gal129 L | 15 / 19 | 510 / 646 mi | |
| 2dr Extended Cab LB 4.3L 6cyl 4M · RWD MPG 15 / 21Range 510 / 714 mi | 4.3L 6cyl 4M | RWD | 34.0 gal129 L | 15 / 21 | 510 / 714 mi | |
| 2dr Regular Cab 4WD LB 4.3L 6cyl 4M · 4WD MPG 15 / 19Range 510 / 646 mi | 4.3L 6cyl 4M | 4WD | 34.0 gal129 L | 15 / 19 | 510 / 646 mi | |
| 2dr Regular Cab LB 4.3L 6cyl 4M · RWD MPG 15 / 21Range 510 / 714 mi | 4.3L 6cyl 4M | RWD | 34.0 gal129 L | 15 / 21 | 510 / 714 mi | |
| Scottsdale 2dr Extended Cab 4WD LB 4.3L 6cyl 4M · 4WD MPG 15 / 19Range 510 / 646 mi | 4.3L 6cyl 4M | 4WD | 34.0 gal129 L | 15 / 19 | 510 / 646 mi | |
| Scottsdale 2dr Extended Cab LB 4.3L 6cyl 4M · RWD MPG 15 / 21Range 510 / 714 mi | 4.3L 6cyl 4M | RWD | 34.0 gal129 L | 15 / 21 | 510 / 714 mi | |
| Scottsdale 2dr Regular Cab 4WD LB 4.3L 6cyl 4M · 4WD MPG 15 / 19Range 510 / 646 mi | 4.3L 6cyl 4M | 4WD | 34.0 gal129 L | 15 / 19 | 510 / 646 mi | |
| Scottsdale 2dr Regular Cab LB 4.3L 6cyl 4M · RWD MPG 15 / 21Range 510 / 714 mi | 4.3L 6cyl 4M | RWD | 34.0 gal129 L | 15 / 21 | 510 / 714 mi | |
| Silverado 2dr Extended Cab 4WD LB 4.3L 6cyl 4M · 4WD MPG 15 / 19Range 510 / 646 mi | 4.3L 6cyl 4M | 4WD | 34.0 gal129 L | 15 / 19 | 510 / 646 mi | |
| Silverado 2dr Extended Cab LB 4.3L 6cyl 4M · RWD MPG 15 / 21Range 510 / 714 mi | 4.3L 6cyl 4M | RWD | 34.0 gal129 L | 15 / 21 | 510 / 714 mi | |
| Silverado 2dr Regular Cab 4WD LB 4.3L 6cyl 4M · 4WD MPG 15 / 19Range 510 / 646 mi | 4.3L 6cyl 4M | 4WD | 34.0 gal129 L | 15 / 19 | 510 / 646 mi | |
| Silverado 2dr Regular Cab LB 4.3L 6cyl 4M · RWD MPG 15 / 21Range 510 / 714 mi | 4.3L 6cyl 4M | RWD | 34.0 gal129 L | 15 / 21 | 510 / 714 mi | |
| Work Truck 2dr Regular Cab 4WD LB 4.3L 6cyl 5M · 4WD MPG 15 / 19Range 510 / 646 mi | 4.3L 6cyl 5M | 4WD | 34.0 gal129 L | 15 / 19 | 510 / 646 mi | |
| Work Truck 2dr Regular Cab LB 4.3L 6cyl 5M · RWD MPG 15 / 21Range 510 / 714 mi | 4.3L 6cyl 5M | RWD | 34.0 gal129 L | 15 / 21 | 510 / 714 mi | |
| No trim matches all of these filters. | ||||||
Tank figures are the manufacturer's rated capacity, sorted smallest tank first. Range is tank size times EPA city or highway MPG (worked out from the rated MPG where the EPA range wasn't published).
How far a 1991 Chevrolet C/K 1500 Series goes on a tank
Gallons left and the distance they cover at each mark on the fuel gauge, at EPA city and highway mileage. At the combined rating of 16 MPG, a full 34.0-gallon tank covers about 544 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 34.0 | 646 | 510 |
| 3/4 | 25.5 | 485 | 383 |
| 1/2 | 17.0 | 323 | 255 |
| 1/4 | 8.5 | 162 | 128 |
| 1/8 | 4.3 | 81 | 64 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 938 gallons, roughly 28 full tanks.
Fuel gauges aren't perfectly linear and the low-fuel light comes on with a few gallons still in the tank, so plan your stop before the last eighth.
What it costs to fill up a 1991 Chevrolet C/K 1500 Series
$145.18 to fill the 34.0-gallon tank from empty with regular, at this week's US average of $4.27 a gallon.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 25.0 gal | Regular | $4.27 | $106.75 | $80.06 |
| 34.0 gal | Regular | $4.27 | $145.18 | $108.88 |
By region, 34.0-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $136.68 |
| Midwest | $4.27 | $145.18 |
| Gulf CoastLowest | $3.70 | $125.80 |
| Rocky Mountain | $4.46 | $151.64 |
| West Coast | $5.42 | $184.28 |
| CaliforniaHighest | $5.89 | $200.26 |
Prices: U.S. Energy Information Administration retail averages for the week of October 26, 2026. This week's prices by state and city.
Your own price
- 25.0-gallon tank$106.75
- 34.0-gallon tank$145.18
- A year of driving (15,000 mi)$4,003
Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.
C/K 1500 Series tank size in other years
The 1991 C/K 1500 Series uses the same 25.0–34.0 gal tank sizes as the 1990 model.
| Model year | Tank | Longest highway range |
|---|---|---|
| 1996 C/K 1500 Series | 25.0–34.0 gal | 714 mi |
| 1995 C/K 1500 Series | 25.0–34.0 gal | 680 mi |
| 1994 C/K 1500 Series | 25.0 gal | 500 mi |
| 1993 C/K 1500 Series | 25.0–42.0 gal | 578 mi |
| 1992 C/K 1500 Series | 25.0–34.0 gal | 680 mi |
| 1991 C/K 1500 Series | 25.0–34.0 gal | 714 mi |
| 1990 C/K 1500 Series | 25.0–34.0 gal | 748 mi |
1991 Chevrolet C/K 1500 Series vs similar 1991 pickups
At 34.0 gallons, the C/K 1500 Series's largest tank ranks second of the three 1991 pickups compared here. The Ford F-150 carries the most (37.2 gal) and the GMC Sierra 1500 the least (34.0 gal).
| 1991 model | Tank | Longest highway range |
|---|---|---|
| Ford F-150 | 34.7–37.2 gal | 707 mi |
| Chevrolet C/K 1500 Series | 25.0–34.0 gal | 714 mi |
| GMC Sierra 1500 | 25.0–34.0 gal | 680 mi |
Other 1991 pickups of a similar size, one model per brand.
Frequently asked questions
What is the fuel tank capacity of the 1991 Chevrolet C/K 1500 Series?
The 1991 Chevrolet C/K 1500 Series holds between 25.0 and 34.0 gallons, depending on the trim. 34.0 gallons is the usual size; the smaller 25.0-gallon tank is on the 2dr Extended Cab 4WD SB.
How many gallons and liters does the 1991 Chevrolet C/K 1500 Series gas tank hold?
The 1991 Chevrolet C/K 1500 Series tank holds 95–129 liters, or 25.0–34.0 gallons in US gallons.
Which 1991 Chevrolet C/K 1500 Series has the biggest gas tank?
The 34.0-gallon tank is on the 2dr Extended Cab 4WD LB, 2dr Extended Cab LB, 2dr Regular Cab 4WD LB and 11 other trims. The smallest tank, 25.0 gallons, is on the 2dr Extended Cab 4WD SB.
Does 4WD change the 1991 Chevrolet C/K 1500 Series gas tank?
No. RWD and 4WD versions of the 1991 Chevrolet C/K 1500 Series use the same 25.0–34.0 gal tank.
How far can a 1991 Chevrolet C/K 1500 Series go on a full tank?
About 300–714 miles on the highway and 225–510 miles in town, going from full to empty at its EPA ratings. Expect less in practice, since nobody runs the tank dry.
How many miles can a 1991 Chevrolet C/K 1500 Series go on a quarter tank?
About 162 highway miles or 128 in town from the 34.0-gallon tank, which has roughly 8.5 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 1991 Chevrolet C/K 1500 Series take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 1991 Chevrolet C/K 1500 Series?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 34.0-gallon tank from empty costs $145.18. It ranges from $125.80 in the Gulf Coast to $200.26 in California.
How much does a full tank of gas weigh in a 1991 Chevrolet C/K 1500 Series?
About 211 pounds for the 34.0-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 1991 Chevrolet C/K 1500 Series have a bigger gas tank than the GMC Sierra 1500?
No, they match: both top out at 34.0 gallons in 1991.
Sources
- Tank sizes: manufacturer-rated capacities from US-market specifications, checked against independent references. Updated October 2026.
- MPG and range: EPA ratings. Range is tank size times EPA MPG.
- Fuel prices: U.S. Energy Information Administration, week of October 26, 2026 (this week's prices).
Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.