You can't imagine what a broad question you asked. What is the leak and what do you have?
what would it cost to fix a leak in a 7.3l fuel heater
depends on where the oil leak is at
It would depend greatly as to where and why it is leaking.
where is it leaking at
That depends on the cause of the leak, the price of those parts, the labor involved in replacing them, etc.
We are going to need to know where the source of the leak is to help you with that question.
It depends on where the leak is coming from. If it is a valve cover gasket it could be less than $100. If it is a rear main seal it could cost close to $700.
Depends entirely where the leak is coming from.
$1,233,451,333.99
It would greatly depend on the source of the leak, need more info.
Depends on where the leak is and how much you are willing to spend. Best thing is to take it to a reputable shop and get a written estimate on what needs to be fixed.
NO DO NOT DO THIS. A BLOWN HEAD GASKET WILL LEAK ANTIFREEZE. CAUSING THE ENGINE TO OVERHEAT. I AM NOT SURE HOW MUCH IT WILL COST TO BE DONE BY A PROFFESIONAL.