Sylvie Willis
The fuel tank size of a vehicle is an important consideration for any owner, and the GMT400 truck is no exception. Owners and enthusiasts of this vehicle have discussed the topic at length, with some seeking to modify their trucks with larger fuel tanks to increase their range. This discussion focuses on the various fuel tank sizes available for the GMT400, the process of modifying the fuel system, and the impact of these changes on the vehicle's performance and functionality. The standard fuel tank capacities for different models within the GMT400 range are also explored.
| Characteristics | Values |
|---|---|
| Fuel tank size | 25 gallons, 34 gallons, 40 gallons, 42 gallons |
| Fuel tank size for 1992 K1500 | 25 gallons |
| Fuel tank size for 8-foot-bed K1500s | 34 gallons |
| Fuel tank size for 6.5-foot-bed K1500s | 25 gallons |
| Fuel efficiency for 1992 K1500 | 17 mpg in the city, 22-23 mpg on the highway |
| Fuel efficiency for GMT400 with 42-gallon tank | 15 mpg on the highway, 12 mpg in the city |
| Fuel tank size for GMT400 trucks | 25 gallons, 34 gallons |
| Fuel tank size for Suburban tanks | 26 gallons, 32 gallons, 40 gallons |
| Fuel tank size for Blazer tanks | 26 gallons |
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What You'll Learn
GMT400 fuel tank sizes vary from 25 to 42 gallons
The fuel tank size in a GMT400 diesel varies. The fuel tank capacity ranges from 25 to 42 gallons. Some sources state that the 1992 K1500 GMT400 trucks have a 25-gallon fuel tank, while others mention that the 8-foot-bed K1500s have a 34-gallon fuel tank and the 6.5-foot-bed K1500s have a 25-gallon fuel tank.
Some owners of the GMT400 trucks have mentioned that they have a 25-gallon stock fuel tank and are curious about whether a 34-gallon fuel tank would be compatible with their vehicle. The dimensions of the 25-gallon tank are 46 x 12 x 13 1/2, while the 34-gallon tank measures 59 x 14 x 13 1/2.
There are also mentions of a 42-gallon fuel tank, which is believed to be the largest tank offered for the GMT400 trucks. This size variation in fuel tanks may be due to different models or configurations, such as the length of the truck bed, with longer beds typically accommodating larger fuel tanks.
It is important to note that some GMT400 owners have explored the possibility of having multiple fuel tanks in their trucks, with some mentioning the ability to run three separate tanks by utilising different plumbing setups. This level of customisation allows for a wide range of fuel capacities and provides flexibility for owners who require extended fuel range or have specific performance goals in mind.
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The 1992 K1500 model has a 25-gallon tank
The 1992 Chevrolet K1500 model has a 25-gallon fuel tank. This model is a four-wheel-drive, half-ton pickup truck. The 25-gallon tank is available in steel, silver, and stainless steel, with some options including a vent tube. The fuel tank's dimensions are 46 x 12 x 13 1/2.
The 1992 K1500 with a 6.5-foot bed comes with the smaller, 25-gallon tank, while the 8-foot-bed K1500s have a larger, 34-gallon fuel tank. The 25-gallon tank is also available for the Chevy/GMC C/K pickup trucks.
The 1992 K1500 model with the 25-gallon tank gets 17 miles per gallon (mpg) in the city and 22 to 23 mpg on the highway, depending on the transmission type.
There are options to replace the 25-gallon tank with a larger 34-gallon tank, but this is not a simple swap, as the setups are different. The 34-gallon tank has dimensions of 59 x 14 x 13 1/2.
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The 8-foot-bed K1500 has a 34-gallon tank
The fuel tank capacity of a vehicle is an important consideration, especially when planning long-distance trips or managing fuel costs. For those seeking a larger fuel capacity, the 8-foot-bed K1500 is an attractive option, as it boasts a 34-gallon tank. This is significantly larger than the 25-gallon tank found in some other models, such as the 1992 K1500.
The 8-foot-bed K1500's 34-gallon tank offers several advantages. Firstly, a larger fuel capacity means fewer refuelling stops, which can save time and inconvenience, especially on long journeys or in areas where fuel stations are scarce. Additionally, the increased capacity can provide a greater range of operation, allowing drivers to travel farther without worrying about running out of fuel.
Another benefit of the 34-gallon tank is the potential for cost savings. With a larger tank, drivers can take advantage of fuel price variations by filling up when prices are low, and potentially reducing the overall cost of fuel in the long run. This is particularly beneficial for those who frequently travel long distances or rely on their vehicles for work, such as delivery drivers or commuters.
The 8-foot-bed K1500's fuel tank capacity also offers flexibility in terms of fuel management. With a 34-gallon tank, drivers have the option to refuel less frequently if they choose, which can be advantageous in areas where fuel prices are consistently high or fluctuate significantly. This flexibility can help drivers optimise their fuel costs and plan their refuelling strategy according to their specific needs and circumstances.
It is worth noting that while the 8-foot-bed K1500 offers a substantial fuel capacity, the physical dimensions of the 34-gallon tank are larger than those of the 25-gallon tank. This may be a consideration for those with specific vehicle size or storage requirements. The 34-gallon tank measures 59 x 14 x 13 1/2 inches, while the 25-gallon tank measures 46 x 12 x 13 1/2 inches. Therefore, it is important to ensure that the larger tank will fit properly and securely in the vehicle before making any modifications or upgrades.
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Suburban tanks come in 26, 32, and 40-gallon sizes
The fuel tank capacity of a vehicle is an important consideration, especially when planning long trips or calculating fuel efficiency. While the exact fuel tank size can vary between different models and years, Suburban tanks are known to come in 26, 32, and 40-gallon sizes.
For instance, the 1992 K1500 GMT400 truck is mentioned as having either a 25-gallon or a 34-gallon fuel tank, depending on the truck bed length. Specifically, the 8-foot-bed K1500s had a 34-gallon fuel tank, while the 6.5-foot-bed K1500s had a 25-gallon fuel tank.
On the other hand, the Suburban, known for its large fuel tanks, offers a range of options. The 2002 Suburban 2500 model is mentioned as having a 38.5-gallon tank, while the 1500 model from the same year has a 31-gallon tank. Interestingly, some older Suburbans, such as the 1985 and 1986 models, are equipped with 40-gallon tanks, which provide ample fuel capacity for long journeys.
It's worth noting that some Suburban owners have also mentioned having tanks larger than 40 gallons, such as 42-gallon tanks, which are believed to be the largest offered. Additionally, some Suburban models have dual tanks, with a main tank and an auxiliary tank, providing even greater fuel capacity and flexibility.
When considering fuel tank size, it's always recommended to refer to the specific vehicle's manual or consult with a mechanic to ensure accurate information for your particular vehicle.
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Converting a GMT400 gas fuel system to diesel is possible
Fuel Tank Capacity and Compatibility
The fuel tank capacity in the GMT400 trucks varies depending on the model year and configuration. The 1992 K1500 GMT400 trucks with a 6.5-foot bed had a 25-gallon fuel tank, while those with an 8-foot bed were equipped with a 34-gallon tank. Some later models, such as the ninth-generation GMT400 Suburban, offered fuel tanks ranging from 40 to 42 gallons for the 5.7 engine. It is believed that the largest fuel tank capacity offered was 42 gallons.
When converting to diesel, it is important to note that diesel fuel is denser than gasoline. This density difference affects the height of the sender float, which, in diesel, would sit higher and provide a flattering reading until the tank runs dry while still showing fuel. Therefore, ensuring accurate fuel level readings is crucial.
Modifications for Diesel Conversion
To convert the GMT400 gas fuel system to diesel, several modifications are necessary:
- Filler Neck and Cap: Enlarge the filler neck hole or find a different filler tube to accommodate the larger diesel fuel pump nozzles at gas stations. Some stations have smaller-style diesel nozzles, but a larger filler neck is generally recommended. Don't forget to get a Green or Yellow Diesel Fuel cap for your new diesel system.
- Fuel Pump and Sender Unit: GMT400 trucks with gasoline engines typically have a fuel pump in the tank. For diesel, you can remove the in-tank pump and replace it with a length of submersible fuel hose. Alternatively, you can use a diesel sender unit, which includes a pickup tube, sock filter, and gauge sender.
- EVAP System: The EVAP system, which includes the line from the fuel tank to the engine bay, charcoal canister, and related wiring, can be removed. However, ensure that the fuel tank has a vent with a rollover valve, typically found in the EVAP system canisters. Verify that the tank has a vent to prevent pressure buildup, and make sure the extra EVAP lines are plugged.
- Hoses and Wiring: Clean and adapt the original supply and return hoses on the chassis to the diesel lift pump and return hard line. For wiring, disconnect the power wire outside the tank, and cut the wires short inside the tank, removing the FP connector. Do not cut the sending unit wire or the ground wire, as they are necessary for the fuel gauge.
- Vent Hose: Run the vent hose as high as possible and then turn it downward. Install an old-school plastic-bodied fuel filter at the end of the hose. You can use a remote rollover vent valve, such as the Tanks Inc. VVR, and piggyback it onto the filler neck mounting bolts.
- In-Tank Wires: The two in-tank wires for the deleted pump can be safely cut short, ensuring that the sending unit wire and ground wire are not affected.
By following these steps and paying close attention to the specific requirements of your GMT400 model, you can successfully convert your gas fuel system to diesel. However, always do your own research, and if in doubt, consult a professional or seek advice from experienced individuals in forums dedicated to diesel conversions.
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Frequently asked questions
The fuel tank capacity of GMT400 trucks varies. Some models have a 25-gallon fuel tank, while others have a 34-gallon fuel tank. There are also mentions of 20-gallon, 26-gallon, 32-gallon, and 40-gallon fuel tanks.
The 25-gallon tank has dimensions of 46 x 12 x 13 1/2, while the 34-gallon tank measures 59 x 14 x 13 1/2.
The 1992 K1500 with a 34-gallon fuel tank gets 17 miles per gallon (mpg) in the city and 22 to 23 mpg on the highway, depending on the transmission type.
Yes, it is possible to replace your current fuel tank with a larger one. However, you should carefully research the compatibility and ensure that you follow the necessary procedures for a safe and proper installation.
When converting a GMT400 gas fuel system to diesel, ensure you use the correct components, such as a diesel fuel cap and diesel filler neck. You should also address the evap/vent outlet and any necessary modifications to the fuel lines and wiring.
