A woman accidentally filled her husband's Ram truck with diesel. She quickly learned her lesson. It was a costly one. In a TikTok that's generated over 174,700 views as of this writing, Mike Pfeffer (@autotechmike) reveals how much it would cost to fix the truck. The dealership quoted them $4,000. Then they went to Pfeffer, who's a mechanic, for a second opinion. He says that the Ram truck had a quarter tank of diesel. It has a gasoline engine. "The customer states, my wife put diesel in my gas truck," he begins his video. "My wife said she put approximately a quarter tank of diesel in, and she drove it four or five miles, then it stalled out," Pfeffer recalls the customer saying. Then he ventured out into the parking lot on the cold, snowy day. "I'm curious to see how much fuel is actually in it," Pfeffer says. As he walks to the truck, Pfeffer explains how he would fix it. "I know he's got the anti-roll-over valve. He can't just stitch something down and siphon it out. So, we'll have to drop the tank," he explains. Pfeffer then says that the dealership told his customer that he'd have to replace the fuel pump, injectors, and other components to fix the issue. That's why the estimated price was so high. Pfeffer concedes that all that work may be necessary, but says, "We're going to try other things first." After checking the tank, he says that all the fuel inside is probably diesel, based on how much the woman said she put in. Then he checks the fuel door to see how it was even possible to insert a diesel nozzle into the truck. "That's exactly how she was able to get diesel into it," he says. The fuel cap has a deep hole that would allow the long diesel nozzle to fit. "The nozzle hole is way down there. I mean, way down there," he says. Most modern vehicles with gasoline engines are designed so that it's difficult, even impossible to insert a diesel nozzle. "I'm going to say that's a design flaw," Pfeffer opines. "I do not see anything on the dash that says unleaded fuel only," he notes. "Then, when we open up the fuel door, I don't see anything that says unleaded fuel only." Pfeffer believes the wife was simply trying to do something nice. He then gets into the cost of the repair. "If we gotta do what the dealer quoted them exactly, we come in $1,200 cheaper than them," he says. He hopes the repair costs even less. "I'm kinda just hoping we can drain the fuel tank, add some actual gas to it, clean some things up, and save them a bit of money," he concludes. Did He Have to Drop the Tank? Some viewers went to the comments section to make suggestions on what to do before dropping the tank. "[Forget] dropping the tank, pull the line at the rail and toss in a test relay and power the pump, pump into a bucket and be done," one said. "Unhook the return hose and power the pump to push the diesel fuel out. Don't need to drop the tank," another added. "Disconnect the supply line and jump the fuel pump relay and pump it out," a third suggested. Pfeffer disagreed. "I swear no one listens to video or what I'm saying. I said we're going to try other things and cheaper options first," he wrote. What Should You Do If You Add Diesel to Your Gasoline Car? Getting diesel and regular gas mixed up when fueling is more common than you might expect. If you put in diesel instead of regular gasoline, don't panic, as you aren't the first person to do this. However, it's essential not to use the vehicle after discovering this mistake, J.D. Power reports. "Putting diesel in a gas engine, even in small amounts, can lead to immediate problems," per Urbs Garage. A number of things can go wrong, and it can easily be an expensive repair, depending on how much you put in, Capital One shares. Symptoms can include rough idling, decreased power, knocking sounds, clogged fuel injectors, fuel pump issues, and engine misfires, according to Urbs Garage. Worst-case scenarios can involve complete engine failures, corroded components, and catalytic converter damage. Here's what to do if you end up putting diesel fuel into a gasoline car: Don't start the engine, Drain the fuel tank, Flush the fuel system, Replace the fuel filter, and Refill with the correct fuel. After you discover the error, have your vehicle towed to a repair shop. There, the tech can complete the necessary steps to prevent further damage and address any other issues that may have arisen. Motor1 contacted Pfeffer via email and Instagram direct message. The story will be updated if he replies. We want your opinion! What would you like to see on Motor1.com? Take our 3 minute survey. - The Motor1.com Team