The 1990 BMW 7 Series has a fuel tank capacity of 21.5 to 24.0 gallons (81–91 liters), depending on the trim. The most common size is 24.0 gallons, used on 2 trims.
A full tank is good for roughly 408–480 highway miles or 264–336 miles around town, going by the EPA ratings.
020 gal40 gal
24.0 gal · Bigger than 88% of 1990 models we list.
Tank figures are the manufacturer's rated capacity, sorted smallest tank first. Range is tank size times EPA city or highway MPG.
How far a 1990 BMW 7 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 24.0-gallon tank covers about 384 miles.
Gauge
Gallons
Highway miles
City miles
Full
24.0
480
336
3/4
18.0
360
252
1/2
12.0
240
168
1/4
6.0
120
84
1/8
3.0
60
42
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 938 gallons, roughly 39 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.
Other 1990 sedans of a similar size, one model per brand.
1990 BMW 7 Series fuel system recalls
NHTSA lists 1 fuel-system recall for the 1990 BMW 7 Series, out of 4 recalls in total. A recall applies only to the vehicles named in it, so check your VIN.
Delivery · Hoses, lines/piping, and fittingsApr 11, 1994 · NHTSA 94V066000 · Bayerische Motoren Werke · 116,300 vehicles
Feed fuel hoses can harden and "set" over time, allowing a seepage of fuel at the connection between the hose and the engine fitting. The clamp used to hold the hose to the fitting is unable to compensate for the hardening of the feed fuel hose.
Risk and remedy
Risk: Fuel seepage between the feed fuel hose and the engine fitting can result in free fuel in the engine compartment, which could result in a fire when exposed to a source of ignition.
Remedy: A redesigned feed fuel hose and hose clamp will be installed to alleviate the fuel seepage.
What is the fuel tank capacity of the 1990 BMW 7 Series?
The 1990 BMW 7 Series holds between 21.5 and 24.0 gallons, depending on the trim. 24.0 gallons is the usual size; the smaller 21.5-gallon tank is on the 735i 4dr Sedan.
How many gallons and liters does the 1990 BMW 7 Series gas tank hold?
The 1990 BMW 7 Series tank holds 81–91 liters, or 21.5–24.0 gallons in US gallons.
Which 1990 BMW 7 Series has the biggest gas tank?
The 24.0-gallon tank is on the 735iL 4dr Sedan, 750iL 4dr Sedan. The smallest tank, 21.5 gallons, is on the 735i 4dr Sedan.
How far can a 1990 BMW 7 Series go on a full tank?
About 408–480 miles on the highway and 264–336 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 1990 BMW 7 Series go on a quarter tank?
About 120 highway miles or 84 in town from the 24.0-gallon tank, which has roughly 6.0 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 1990 BMW 7 Series take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 1990 BMW 7 Series?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 24.0-gallon tank from empty costs $102.48. It ranges from $88.80 in the Gulf Coast to $141.36 in California.
How much does a full tank of gas weigh in a 1990 BMW 7 Series?
About 149 pounds for the 24.0-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 1990 BMW 7 Series have a bigger gas tank than the Jaguar XJ-Series?
No, they match: both top out at 24.0 gallons in 1990.
Has the 1990 BMW 7 Series had a fuel pump or fuel system recall?
Yes. NHTSA lists 1 fuel-system recall for the 1990 BMW 7 Series: 94V066000 (delivery · hoses, lines/piping, and fittings). Check your VIN at nhtsa.gov/recalls to see if your car is affected.
Sources
Tank sizes: manufacturer-rated capacities from US-market specifications, checked against independent references. Updated October 2026.
MPG and range: EPA ratings (fueleconomy.gov). Range is tank size times EPA MPG.
Fuel prices: U.S. Energy Information Administration, week of October 26, 2026 (this week's prices).