Emergency services were called to the blaze at junction 2 Pitreavie at 6.40am on Thursday.
As a result, huge tailbacks were caused towards the Queensferry Crossing.
A Traffic Scotland spokesman said: “Traffic is busier than normal due to the junction two off-slip to the A823 being blocked by a car fire.
“Southbound is queuing around J2A and J2 Pitreavie to the Queensferry Crossing.”
A Scottish Fire and Rescue Service spokesman added: “We requested for assistance from the highways team due to a diesel spillage.
“We left at 7.25am.”
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