What Is the Average Cost of Replacing a Car’s Fuel Line? Most fuel lines can be repaired for no less than $120 dollars. If the fuel line has to be replaced entirely, the cost depends greatly on whether the mechanic has to drop the car’s fuel tank to replace the lines. If so, this can add an additional $400 or $500.Click to see full answer. Similarly one may ask, how much does it cost to replace a fuel line?If you need fuel hose replacement, the average cost can vary a lot depending on the make and model, anywhere from $120 to $500 or even more. Older cars are more susceptible to fuel hose leaks as newer models typically use hard fuel lines more often.Also, can you drive a car with a fuel line leak? It’s never safe to drive a car with a fuel leak. Fuel leaks are one of the top causes of vehicle fires. Gas is highly flammable, so it is highly likely that the gas could start a fire, either in the vehicle itself or from the fuel left behind from a leaking vehicle. In respect to this, how much does it cost to fix a broken fuel line? Ignored a fuel line leak Fixing a leaking fuel line is a simple task for a repair facility and costs between $60 and $120. Lavacot says it can easily be done at home by the semi-advanced mechanic.Can you repair a fuel line?Fuel line leaks cannot be repaired and need to be replaced with a new line. Cutting parts out of the damaged line and replacing with fittings at the leak will cause the lines to be too short to mount properly.