NASHVILLE, Tenn. -- Finding regular-grade gasoline is becoming more difficult in middle Tennessee.

A Shell station in west Nashville ran out of regular gasoline at 6 p.m. on May 3.

Blake Tidwell of Nashville said he was surprised when he couldn't find regular grade gas at a BP station on West End Avenue. A number of other stations didn't have regular grade, either.

"I filled up last Friday -- had no idea it was an issue until a couple of hours ago," said Tidwell.

With only two fuel terminals operating in Nashville because of flood or power problems, gas delivery drivers have had to wait long hours to fill their tankers.

The problem, according to fuel hauler Herb Royles, is not supply but getting to the supply.

"Right now, I've only been here two hours. Earlier today, I was here five hours for one load to one station," said Royles.

The long line of fuel trucks that snakes its way around the terminal has a domino effect at the gas pump.

"What happens is the other station suffers, and they run out, and these people go to that station where the gas is at. They go to the next one, suck it dry, and that's where we get our snowball affect," said Royles.

Royles said he had to wait hours for his turn to fill up his tanker.

Tidwell had to settle for a different grade of gasoline that the BP station was running out of quickly.

"This is the first time I have filled up since last week, so I guess I will go with the mid-grade," said Tidwell.

Gas delivery drivers said if the problem continues, motorists can expect more spot shortages.