Sylvie Willis
Jeep Wranglers have had fuel tanks with a capacity of 15 gallons. Some models, such as the 1991-1995 Jeep Wranglers, had a 20-gallon tank that was limited to 15 gallons by the manufacturer. This was done by installing a longer vent tube, preventing more fuel from being added. Some Jeep owners have modified their 15-gallon tanks to hold 20 gallons by cutting or removing the vent tube. However, some Wrangler owners have experienced issues with their 15-gallon metal tanks, only being able to use 10 gallons of fuel before running out.
| Characteristics | Values |
|---|---|
| Year of Jeep model | 1978, 1984, 1985, 1990, 1991, 1992, 1993, 1995, 1997, 1998, 2006 |
| Jeep model | CJ7, YJ, TJ, JK |
| Fuel tank capacity | 15 gallons, 19 gallons, 20 gallons |
| Fuel tank material | Plastic, steel |
| Fuel gauge accuracy | Inaccurate |
| Solutions to increase fuel capacity | Cutting the vent tube/filler tube, Removing the basket, Reinforcing the basket, Modifying the pickup line |
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What You'll Learn
Jeep Wranglers with 15-gallon tanks
The 15-gallon tanks were introduced as a cost-cutting measure by Chrysler, who wanted to avoid the expense of manufacturing two separate gas tanks for the 14.9-gallon and 19.7-gallon models. To achieve this, they used a single tank for both models and extended the fill vent tube down into the tank. This meant that the tank could only be filled to the 15-gallon mark, as the longer vent tube prevented any more air from escaping and therefore any more fuel from entering the tank.
Some Jeep owners have discovered that by removing or shortening the vent tube, they can increase the tank's capacity to 20 gallons. This modification involves dropping the gas tank and cutting the vent tube to a length of two to four inches, allowing for a full 20 gallons of fuel to be added.
The 15-gallon tanks were also used in some older Jeep models, such as the 1978 CJ7, which had a 15-gallon steel tank. However, the option to upgrade to a 20-gallon tank was available for some of these older models as well.
While the 15-gallon tanks offer a good balance between tank capacity and fuel efficiency, some Jeep owners prefer the larger 20-gallon tanks to avoid refuelling as frequently.
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Wranglers' 15-gallon tanks only take 10 gallons
Jeep Wranglers have been the subject of much discussion regarding their fuel tank capacities. Some models, such as the 1991-1995 Jeep Wranglers, were found to have plastic tanks capable of holding 20 gallons. However, Jeep limited the capacity of some of these tanks to 15 gallons by installing a longer vent tube, preventing the tank from being filled beyond 15 gallons.
It is important to note that the fuel gauge on these vehicles may not always provide an accurate reading. Some Wrangler owners have reported that their fuel gauge showed a full tank after filling up with only 10 or 10.5 gallons of fuel. This discrepancy may be due to a variety of factors, including issues with the sending unit, pickup tube, or vent hose.
One possible explanation for the issue of only being able to use 10 gallons in a 15-gallon tank could be a problem with the sending unit. The sending unit is responsible for communicating the fuel level to the gauge, and if it is not functioning properly, it can lead to inaccurate readings. Another potential cause may be related to the pickup tube, which may have become detached from the bottom of the fuel pump, resulting in the engine dying before the tank is truly empty.
To resolve this issue, some Wrangler owners have performed modifications to their fuel tanks. One common modification involves cutting or removing the vent tube to increase the tank's capacity. By shortening or removing the vent tube, it is possible to add an extra 5 gallons to the tank's capacity. However, it is important to carefully consider the potential inconveniences of having only 10 gallons of fuel available before attempting any modifications.
In conclusion, while Jeep Wranglers may have 15-gallon fuel tanks, there have been reports of tanks only taking 10 gallons of fuel. This discrepancy may be due to a variety of factors, including issues with the sending unit, pickup tube, or vent hose. To resolve this issue, some Wrangler owners have successfully modified their fuel tanks by cutting or removing the vent tube to increase the tank's capacity.
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Wranglers' 20-gallon tanks
Jeep Wranglers were originally fitted with 15-gallon fuel tanks. However, some Jeep owners have discovered that their plastic tanks are capable of holding 20 gallons of fuel. This was due to Jeep limiting the capacity of some tanks to 15 gallons by installing a longer vent tube.
Some owners have performed a "20-gallon conversion" to modify their fuel tanks to hold 20 gallons. This involves removing or cutting the vent tube to a shorter length. This modification can be performed by the owner, but it is recommended that a professional is involved in the installation of the 20-gallon tank.
The 20-gallon conversion has several benefits for Jeep Wrangler owners. Firstly, it increases the Jeep's range, reducing the frequency of refuelling. Secondly, the 20-gallon tanks are made from thick polyethylene plastic, which is resistant to the chemicals in fuel and can handle impacts and scrapes. This makes the tanks sturdy and durable.
There are some potential drawbacks to the 20-gallon conversion. One owner has noted that their fuel gauge is not accurate since performing the conversion. Another potential issue is that the 20-gallon tank hangs down further than the 15-gallon tank, which may cause fitment issues. Additionally, the conversion may not be suitable for all export models of the Jeep Wrangler.
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Wranglers' inaccurate fuel gauges
Jeep Wranglers have had fuel tank capacities of 15 gallons and 20 gallons. From 1991 through at least 1995, all plastic tanks could hold 20 gallons. However, Jeep limited the capacity of some tanks to 15 gallons by installing a longer vent tube, preventing more fuel from being added. Some Jeep owners have modified their tanks to increase their capacity.
Some Jeep Wrangler owners have reported issues with inaccurate fuel gauges. One user reported that their fuel gauge did not change at the top end, even after filling their tank. Another user reported that their fuel gauge read about 1/4 full after filling up, and later read 3/4 full, with no consistency in relation to the fuel used. Another Wrangler owner reported that their fuel gauge did not move at all for the first 60 miles of a trip, and their range indicator was inaccurate, stating they had 30 miles and 30 gallons left when they actually had none.
In some cases, the inaccuracy of the fuel gauge in Jeep Wranglers may be due to a faulty fuel level sensor or a damaged sending unit. The fuel tank may have bowed, interfering with or damaging the sending unit, which would require replacement. In other cases, the issue may be due to a switch in the brand or model of the float sensor without updating the calibration data.
To address the issue of inaccurate fuel gauges, some Wrangler owners have suggested resetting the trip meter at fill-up and refilling the tank when approaching 200 miles. Others have recommended replacing the fuel pump assembly, as the part responsible for the fuel level is part of the fuel sending unit. It is also suggested to avoid filling the tank past the first automatic shut-off, as this can interfere with the environmental and electrical components that seal the tank airtight.
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Wranglers' 19-gallon tanks
Jeep Wranglers have had fuel tanks with varying capacities over the years, with some models offering both 15 and 20-gallon options. The 1991-1995 Jeep Wranglers, for example, had plastic tanks capable of holding 20 gallons, but Jeep limited the capacity of some of these tanks to 15 gallons by installing a longer vent tube.
Now, let's focus on the Wrangler's 19-gallon tanks:
Some Jeep Wrangler owners have reported that their vehicles have 19-gallon fuel tanks. This is a less common capacity compared to the more standard 15 or 20-gallon tanks. The discrepancy between the expected and actual fuel tank capacity in some Wranglers could be due to a variety of factors, including manufacturing variations, aftermarket modifications, or inaccurate fuel gauges.
One common issue with Wrangler fuel gauges is their inaccuracy. Some owners have reported that their gauges indicate significantly less fuel than is actually in the tank. This could lead to confusion about the actual tank capacity if an owner is relying solely on the gauge to determine how much fuel their Wrangler can hold.
To accurately determine the fuel tank capacity, some Wrangler owners have conducted experiments. These include letting the tank run extremely low or empty, filling it up, and then calculating the total mileage per tank. Others have physically measured the tank's dimensions and converted them to estimate the capacity in gallons.
Additionally, some Wrangler owners have modified their fuel tanks to increase their capacity. This involves altering the vent tube or filler tube length, allowing for more fuel to be added. It's possible that some of the reported 19-gallon tanks are a result of these modifications.
It's worth noting that the fuel sending unit, which provides fuel level information to the gauge, can also be a source of inaccuracy. Some Wrangler owners have replaced their factory sending units with aftermarket ones designed for larger or smaller tanks, which can lead to discrepancies between the actual fuel level and the gauge reading.
In conclusion, while Jeep Wranglers are typically associated with 15 or 20-gallon fuel tanks, there have been reports of 19-gallon tanks in certain models or after modifications. Wrangler owners who are curious about their vehicle's fuel tank capacity can refer to their owner's manual, conduct experiments, or consult Jeep forums for insights and advice from other Wrangler enthusiasts.
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Frequently asked questions
Yes, Jeep Wranglers from 1991 to 1995 had 15-gallon fuel tanks. Jeep limited the capacity of these tanks by installing a longer vent tube, preventing more fuel from being added.
One way to tell is by measuring the vent pipe on the outside of the tank. A two-inch vent pipe indicates a 20-gallon tank, while a vent pipe longer than two inches indicates a 15-gallon tank.
Yes, it is possible to modify your Jeep's 15-gallon fuel tank to hold more fuel. Some Jeep owners have reported success in increasing the capacity of their fuel tanks by cutting or removing the vent tube. However, it is important to exercise caution and consult a professional before attempting any modifications.
